Under the influence of anthropogenic and climate change,the problems caused by urban heat island(UHI)has become increasingly prominent.In order to promote urban sustainable development and improve the quality of human...Under the influence of anthropogenic and climate change,the problems caused by urban heat island(UHI)has become increasingly prominent.In order to promote urban sustainable development and improve the quality of human settlements,it is significant for exploring the evolution characteristics of urban thermal environment and analyzing its driving forces.Taking the Landsat series images as the basic data sources,the winter land surface temperature(LST)of the rapid urbanization area of Fuzhou City in China was quantitatively retrieved from 2001 to 2021.Combing comprehensively the standard deviation ellipse model,profile analysis and GeoDetector model,the spatio-temporal evolution characteristics and influencing factors of the winter urban thermal environment were systematically analyzed.The results showed that the winter LST presented an increasing trend in the study area during 2001–2021,and the winter LST of the central urban regions was significantly higher than the suburbs.There was a strong UHI effect from 2001 to 2021with an expansion trend from the central urban regions to the suburbs and coastal areas in space scale.The LST of green lands and wetlands are significantly lower than croplands,artificial surface and unvegetated lands.Vegetation and water bodies had a significant mitigation effect on UHI,especially in the micro-scale.The winter UHI had been jointly driven by the underlying surface and socio-economic factors in a nonlinear or two-factor interactive enhancement mode,and socio-economic factors had played a leading role.This research could provide data support and decision-making references for rationally planning urban layout and promoting sustainable urban development.展开更多
The integration of agricultural heritage and tourism industry contributes significantly to regional heritage protection,rural revitalization,and cultural inheritance.Based on the coupling coordination degree model,a q...The integration of agricultural heritage and tourism industry contributes significantly to regional heritage protection,rural revitalization,and cultural inheritance.Based on the coupling coordination degree model,a quantitative research was conducted to study the integration of agricultural heritage in terms of the jasmine and tea culture system in Fuzhou with the local tourism industry.The results showed that both the development of Fuzhou's jasmine and tourism industries have advanced significantly and are currently leading in the country.However,they are not developing at the same pace.The results also showed that the coordination degree between Fuzhou5s jasmine and tourism industries have increased in recent years,with deepened mutual effects and improved coordination.Moreover,the coupling coordination degree has been rising over the past 13 years,with the coupling coordination level transforming from''extreme disorder''to"quality coordination,demonstrating a slow integration progress of Fuzhou's jasmine with the tourism industry at the early stage,but a sound development momentum at the later stage.展开更多
Linpu Village of Fuzhou City was selected for research,colors of representative buildings there including ancient dwellings,ancestral halls,and temples were analyzed using field research,color atla comparison,data col...Linpu Village of Fuzhou City was selected for research,colors of representative buildings there including ancient dwellings,ancestral halls,and temples were analyzed using field research,color atla comparison,data collection,and analysis and induction,in accordance with the Chinese Color System,the color composition of each type of building was summarized.Regional characteristics and causes of the architectural color of Linpu Village were further explored analyzing the geographical location,local customs and practices,and architectural functions of the village.Finally,according to the dual requirements of building beautiful villages and cultural heritage protection,suggestions for establishing color standards for buildings in traditional villages were put forward.展开更多
The chemical compositions of the head space,essential oil and absolute of jasmin flowers in different farming seasons during the blossom period in Fuzhou were reported in this paper.
Found in 1958, Fuzhou Printing inkhas a long history of more than 40 years.It mainly produces various printing ink,interrelated synthetized resin, vehicleand inside coatings and outside coatingsfor three-piece metalli...Found in 1958, Fuzhou Printing inkhas a long history of more than 40 years.It mainly produces various printing ink,interrelated synthetized resin, vehicleand inside coatings and outside coatingsfor three-piece metallic containersincluding food tin cans of the展开更多
The Fuzhou Changle International Airport, the largest international airport in China, was given approval to open to air traffic on June 23 by the Civil Aviation Administration of China (CAAC).
In developing an export-oriented economy, Fuzhou city has negotiated for and made use of foreign investment funds to improve old enterprises. Forty six percent of the city’s enterprises in industry and communications...In developing an export-oriented economy, Fuzhou city has negotiated for and made use of foreign investment funds to improve old enterprises. Forty six percent of the city’s enterprises in industry and communications have set up 68 joint or cooperative ventures through various forms of negotiation. These enterprises have improved production and operation and have had a higher展开更多
Public signs, as a city's "name card", have attracted wide attention. However,inappropriate translation of public signs are ubiquitous with some even cause misunderstandings for international visitors. I...Public signs, as a city's "name card", have attracted wide attention. However,inappropriate translation of public signs are ubiquitous with some even cause misunderstandings for international visitors. In this paper, we first introduce the function of public signs, then through case analysis many problems are exposed and those errors bring a lot of inconvenience for foreigners who live and work in China.What's worse, to some extent, China's image and reputation will also be undermined.Finally, an appeal is made for a standardized translation of public signs and more research should be done and effective measures should be taken to improve the quality of the language environment and public signs translation.展开更多
It has been proven by a number of earthquake case studies that an active fault-induced earthquake beneath a city can be devastating. It is an urgent issue for seismic hazard reduction to explore the distribution of ac...It has been proven by a number of earthquake case studies that an active fault-induced earthquake beneath a city can be devastating. It is an urgent issue for seismic hazard reduction to explore the distribution of active faults beneath the urban area and identify the seismic source and the risks underneath. As a pilot project of active fault exploration in China, the project, entitled “Active fault exploration and seismic hazard assessment in Fuzhou City", started in early 2001 and passed the check before acceptance of China Earthquake Administration in August 2004. The project was aimed to solve a series of scientific issues such as fault location, dating, movement nature, deep settings, seismic risk and hazard, preparedness of earthquake prevention and disaster reduction, and etc. by means of exploration and assessment of active faults by stages, i.e., the preliminary survey and identification of active faults in target area, the exploration of deep seismotectonic settings, the risk evaluation of active seismogenic faults, the construction of geographic information system of active faults, and so on. A lot of exploration methods were employed in the project such as the detection of absorbed mercury, free mercury and radon in soil, the geological radar, multi-channel DC electrical method, tsansient electromagnetic method, shallow seismic refraction and reflection, effect contrast of explored sources, and various sounding experiments, to establish the buried Quaternary standard section of the Fuzhou basin. By summing up, the above explorations and experiments have achieved the following results and conclusions: (1)The results of the synthetic pilot project of active fault exploration in Fuzhou City demonstrate that, on the basis of sufficient collection, sorting out and analysis of geological, geophysical and borehole data, the best method for active fault exploration (location) and seismic risk assessment (dating and characterizing) in urban area is the combination of various approaches, that is, the possible location of active fault determined by using geochemical exploration as a guide “scout", the shallow seismic sounding as the main tool, the electromagnetic method as a supplement, establishing the standard Quaternary profile or stratigraphic sequence from drilling and various geophysical parameters from borehole logs as methods to correct and verify the data above. And in addition, the method also includes the field surveys on fault exposures, trenching, paleoearthquake investigation, dating and comparison of lithology, strata sequence, absolute or relative ages of the cores on the two sides of buried faults. (2)The Fuzhou basin locates under the regional seismotectonic settings which have the potential of moderate earthquake. Comparatively, the region is less affected by the “Taiwan dynamic Antenna"; (3)The activity of the major faults in Fuzhou basin is weak in general. All the six identified target faults are not Holocene faults, among which the Bayi Reservoir-Shanggan fault and the Minhou-Nanyu fault are dormant at least since the mid Epipleistocene time, and the rest are dormant since the Epipleistocene time; (4)In terms of deep-seated structures beneath the basin, there is no evidence indicating the possible occurrence of the underneath strong destructive earthquakes. The adjacent Changle-Zhao’an fault zone is the potential seismic source which may possibly affect Fuzhou City; (5)There exists potential of moderate-strong earthquake on the major faults of the region, but the probability is low; (6)The seismic hazards are weak in the region and the surface earthquake fractures are not likely to occur; (7)The first geographic information system of active faults is developed with functions of information query and display, data management, analysis and processing, etc.展开更多
For data of atmospheric composition missing,fog and haze days were distinguished based on the standard of meteorological industry Observation and Forecasting Levels of Haze( QX /T113-2010) and four user-defined standa...For data of atmospheric composition missing,fog and haze days were distinguished based on the standard of meteorological industry Observation and Forecasting Levels of Haze( QX /T113-2010) and four user-defined standards,and using data of surface meteorological factors in Fuzhou City,China from 2005 to 2011,temporal distributions of fog and haze days were analyzed respectively to provide methods for fog and haze forecast. The results showed that there were 28. 9 fog days and 89. 7 haze days per year in Fuzhou. Both fog and haze days were variable,and there might be a day difference of twice to thrice among the years. They were the most in 2007,and then decreased in recent years. Both fog and haze days were more in winter and spring,accounted for 94. 1% and 70. 1% respectively,while in summer and autumn,they only accounted for5. 9% and 29. 9% respectively. In a day,fog mainly occurred from night to early morning,while haze occurred mainly at about noon,which demonstrated that fog and haze are different synoptic phenomena. The mass concentration of PM2. 5in fog days was 34 μg /m3,while it was 61 μg/m3in haze days,and in 22% of haze days it was larger than 75 μg /m3,which was above the national second-grade ambient air quality standard.展开更多
Volatile components of Fuzhou Yulu, a Chinese fish sauce, were analyzed by gas chromatography-mass spectrometry (GC-MS), and two pretreatment methods, i.e., purge and trap (P&T) GC-MS and ethyl acetate extraction ...Volatile components of Fuzhou Yulu, a Chinese fish sauce, were analyzed by gas chromatography-mass spectrometry (GC-MS), and two pretreatment methods, i.e., purge and trap (P&T) GC-MS and ethyl acetate extraction followed by GC-MS, were compared. P&T-GC-MS method determined 12 components, including sulfur-containing constituents (such as dimethyl disulfide), nitrogen-containing constituents (such as pyrazine derivatives), aldehydes and ketones. Ethyl acetate extraction fol- lowed by GC-MS method detected 10 components, which were mainly volatile organic acids (such as benzenepropanoic acid) and esters. Neither of the two methods detected alcohols or trimethylamine. This study offers an important reference to determine volatile flavor components of traditional fish sauce through modern analysis methods.展开更多
[Objective] The aim was to explore the nutrient status of tobacco-planting soil,and find out the fertilization strategy for flue-cured tobacco. [Method]The nutrient contents in 142 soil samples from 7 tobacco planting...[Objective] The aim was to explore the nutrient status of tobacco-planting soil,and find out the fertilization strategy for flue-cured tobacco. [Method]The nutrient contents in 142 soil samples from 7 tobacco planting counties in Fu Zhou city were determined and evaluated. [Result]The organic matter content was on the high side,and most soil was acid soil. The soil had abundant total nitrogen,total phosphorus and total potassium,moderate available nitrogen and available phosphorus,low available potassium,high water soluble chlorine,low soil cation exchange capacity and rich effective zinc,but effective boron was famine. [Conclusion] The meta-acid soil should be conducted with p H adjustment,and rational nitrogen,phosphorus and potassium application.展开更多
Based on detailed logging of fourteen drill holes, combined with the results of other researchers, the preliminary summarization on sedimentary characteristics of the late Pleistocene of the Fuzhou basin is done. The ...Based on detailed logging of fourteen drill holes, combined with the results of other researchers, the preliminary summarization on sedimentary characteristics of the late Pleistocene of the Fuzhou basin is done. The deposition of Fuzhou basin began from about 56.5ka BP and the sediments are composed of gravel, sand, clay and silt, which show a depositional sequence with granularity becoming smaller from the lower to the upper and a big lateral variation of lithology. There are three silt layers in late Quaternary strata of Fuzhou basin. The first and second layers were developed during the middle and late Holocene, the deposition time is about 7.86ka BP to 1.44 ka BP and they are the results of “Changle Transgression". The third was developed during the late of late Pleistocene and the deposition time is from 44ka BP to 20ka BP and it is the result of “Fuzhou Transgression".The buried late Quaternary sediments in Fuzhou basin can be divided into upper Pleistocene series and Holocene series, which include four formations from old to new. They are the Longhai formation (Q^3_pl), Dongshan formation (Qhd), Changle formation (Qhc) and Jiangtian formation (Qhj), respectively. The Longhai formation can be divided into three members and belongs to the Pleistocene series, other three formations belong to the Holocene series.展开更多
Based on the content of radioactive elements (U, Th, K) of strata in two drill holes in the Fuzhou basin, and combined with the result of spore_pollen analysis, the relationship between radioactivity and lithology and...Based on the content of radioactive elements (U, Th, K) of strata in two drill holes in the Fuzhou basin, and combined with the result of spore_pollen analysis, the relationship between radioactivity and lithology and deposit environments is discussed and the results show that the content of radioactive substances is related to the granularity and lithology in sediment, and it is higher in argillaceous sediment (e.g. silt and clay), lower in sand sediment and in the middle in gravels between the above two kinds of sediment. The content of radioactive substances is also related to paleoclimate. A warm and humid environment is propitious to the deposition of radioactive substances, while a cool and dry climate is just the reverse.展开更多
基金Under the auspices of the Social Science and Humanity on Young Fund of the Ministry of Education of China(No.21YJCZH100)the Scientific Research Project on Outstanding Young of the Fujian Agriculture and Forestry University(No.XJQ201920)+1 种基金the Science and Technology Innovation Special Fund Project of Fujian Agriculture and Forestry University(No.CXZX2021032)the Forestry Peak Discipline Construction Project of Fujian Agriculture and Forestry University(No.72202200205)。
文摘Under the influence of anthropogenic and climate change,the problems caused by urban heat island(UHI)has become increasingly prominent.In order to promote urban sustainable development and improve the quality of human settlements,it is significant for exploring the evolution characteristics of urban thermal environment and analyzing its driving forces.Taking the Landsat series images as the basic data sources,the winter land surface temperature(LST)of the rapid urbanization area of Fuzhou City in China was quantitatively retrieved from 2001 to 2021.Combing comprehensively the standard deviation ellipse model,profile analysis and GeoDetector model,the spatio-temporal evolution characteristics and influencing factors of the winter urban thermal environment were systematically analyzed.The results showed that the winter LST presented an increasing trend in the study area during 2001–2021,and the winter LST of the central urban regions was significantly higher than the suburbs.There was a strong UHI effect from 2001 to 2021with an expansion trend from the central urban regions to the suburbs and coastal areas in space scale.The LST of green lands and wetlands are significantly lower than croplands,artificial surface and unvegetated lands.Vegetation and water bodies had a significant mitigation effect on UHI,especially in the micro-scale.The winter UHI had been jointly driven by the underlying surface and socio-economic factors in a nonlinear or two-factor interactive enhancement mode,and socio-economic factors had played a leading role.This research could provide data support and decision-making references for rationally planning urban layout and promoting sustainable urban development.
文摘The integration of agricultural heritage and tourism industry contributes significantly to regional heritage protection,rural revitalization,and cultural inheritance.Based on the coupling coordination degree model,a quantitative research was conducted to study the integration of agricultural heritage in terms of the jasmine and tea culture system in Fuzhou with the local tourism industry.The results showed that both the development of Fuzhou's jasmine and tourism industries have advanced significantly and are currently leading in the country.However,they are not developing at the same pace.The results also showed that the coordination degree between Fuzhou5s jasmine and tourism industries have increased in recent years,with deepened mutual effects and improved coordination.Moreover,the coupling coordination degree has been rising over the past 13 years,with the coupling coordination level transforming from''extreme disorder''to"quality coordination,demonstrating a slow integration progress of Fuzhou's jasmine with the tourism industry at the early stage,but a sound development momentum at the later stage.
基金Sponsored by Social Science Planning Project of Fujian Province(FJ2016C080)Science and Technology Innovation Special Funded Project of Fujian Agriculture and Forestry University(CXZX2017606)
文摘Linpu Village of Fuzhou City was selected for research,colors of representative buildings there including ancient dwellings,ancestral halls,and temples were analyzed using field research,color atla comparison,data collection,and analysis and induction,in accordance with the Chinese Color System,the color composition of each type of building was summarized.Regional characteristics and causes of the architectural color of Linpu Village were further explored analyzing the geographical location,local customs and practices,and architectural functions of the village.Finally,according to the dual requirements of building beautiful villages and cultural heritage protection,suggestions for establishing color standards for buildings in traditional villages were put forward.
文摘The chemical compositions of the head space,essential oil and absolute of jasmin flowers in different farming seasons during the blossom period in Fuzhou were reported in this paper.
文摘Found in 1958, Fuzhou Printing inkhas a long history of more than 40 years.It mainly produces various printing ink,interrelated synthetized resin, vehicleand inside coatings and outside coatingsfor three-piece metallic containersincluding food tin cans of the
文摘The Fuzhou Changle International Airport, the largest international airport in China, was given approval to open to air traffic on June 23 by the Civil Aviation Administration of China (CAAC).
文摘In developing an export-oriented economy, Fuzhou city has negotiated for and made use of foreign investment funds to improve old enterprises. Forty six percent of the city’s enterprises in industry and communications have set up 68 joint or cooperative ventures through various forms of negotiation. These enterprises have improved production and operation and have had a higher
文摘Public signs, as a city's "name card", have attracted wide attention. However,inappropriate translation of public signs are ubiquitous with some even cause misunderstandings for international visitors. In this paper, we first introduce the function of public signs, then through case analysis many problems are exposed and those errors bring a lot of inconvenience for foreigners who live and work in China.What's worse, to some extent, China's image and reputation will also be undermined.Finally, an appeal is made for a standardized translation of public signs and more research should be done and effective measures should be taken to improve the quality of the language environment and public signs translation.
文摘It has been proven by a number of earthquake case studies that an active fault-induced earthquake beneath a city can be devastating. It is an urgent issue for seismic hazard reduction to explore the distribution of active faults beneath the urban area and identify the seismic source and the risks underneath. As a pilot project of active fault exploration in China, the project, entitled “Active fault exploration and seismic hazard assessment in Fuzhou City", started in early 2001 and passed the check before acceptance of China Earthquake Administration in August 2004. The project was aimed to solve a series of scientific issues such as fault location, dating, movement nature, deep settings, seismic risk and hazard, preparedness of earthquake prevention and disaster reduction, and etc. by means of exploration and assessment of active faults by stages, i.e., the preliminary survey and identification of active faults in target area, the exploration of deep seismotectonic settings, the risk evaluation of active seismogenic faults, the construction of geographic information system of active faults, and so on. A lot of exploration methods were employed in the project such as the detection of absorbed mercury, free mercury and radon in soil, the geological radar, multi-channel DC electrical method, tsansient electromagnetic method, shallow seismic refraction and reflection, effect contrast of explored sources, and various sounding experiments, to establish the buried Quaternary standard section of the Fuzhou basin. By summing up, the above explorations and experiments have achieved the following results and conclusions: (1)The results of the synthetic pilot project of active fault exploration in Fuzhou City demonstrate that, on the basis of sufficient collection, sorting out and analysis of geological, geophysical and borehole data, the best method for active fault exploration (location) and seismic risk assessment (dating and characterizing) in urban area is the combination of various approaches, that is, the possible location of active fault determined by using geochemical exploration as a guide “scout", the shallow seismic sounding as the main tool, the electromagnetic method as a supplement, establishing the standard Quaternary profile or stratigraphic sequence from drilling and various geophysical parameters from borehole logs as methods to correct and verify the data above. And in addition, the method also includes the field surveys on fault exposures, trenching, paleoearthquake investigation, dating and comparison of lithology, strata sequence, absolute or relative ages of the cores on the two sides of buried faults. (2)The Fuzhou basin locates under the regional seismotectonic settings which have the potential of moderate earthquake. Comparatively, the region is less affected by the “Taiwan dynamic Antenna"; (3)The activity of the major faults in Fuzhou basin is weak in general. All the six identified target faults are not Holocene faults, among which the Bayi Reservoir-Shanggan fault and the Minhou-Nanyu fault are dormant at least since the mid Epipleistocene time, and the rest are dormant since the Epipleistocene time; (4)In terms of deep-seated structures beneath the basin, there is no evidence indicating the possible occurrence of the underneath strong destructive earthquakes. The adjacent Changle-Zhao’an fault zone is the potential seismic source which may possibly affect Fuzhou City; (5)There exists potential of moderate-strong earthquake on the major faults of the region, but the probability is low; (6)The seismic hazards are weak in the region and the surface earthquake fractures are not likely to occur; (7)The first geographic information system of active faults is developed with functions of information query and display, data management, analysis and processing, etc.
基金Supported by the Key Project of Science and Technology Department of Fujian Province,China in 2012(2012Y0009)
文摘For data of atmospheric composition missing,fog and haze days were distinguished based on the standard of meteorological industry Observation and Forecasting Levels of Haze( QX /T113-2010) and four user-defined standards,and using data of surface meteorological factors in Fuzhou City,China from 2005 to 2011,temporal distributions of fog and haze days were analyzed respectively to provide methods for fog and haze forecast. The results showed that there were 28. 9 fog days and 89. 7 haze days per year in Fuzhou. Both fog and haze days were variable,and there might be a day difference of twice to thrice among the years. They were the most in 2007,and then decreased in recent years. Both fog and haze days were more in winter and spring,accounted for 94. 1% and 70. 1% respectively,while in summer and autumn,they only accounted for5. 9% and 29. 9% respectively. In a day,fog mainly occurred from night to early morning,while haze occurred mainly at about noon,which demonstrated that fog and haze are different synoptic phenomena. The mass concentration of PM2. 5in fog days was 34 μg /m3,while it was 61 μg/m3in haze days,and in 22% of haze days it was larger than 75 μg /m3,which was above the national second-grade ambient air quality standard.
基金supported by the Science and Technology Bureau of FujianProvince, China (No. B50701)the Foundation for Young Pro-fessors of Jimei University, China (No. C19005)
文摘Volatile components of Fuzhou Yulu, a Chinese fish sauce, were analyzed by gas chromatography-mass spectrometry (GC-MS), and two pretreatment methods, i.e., purge and trap (P&T) GC-MS and ethyl acetate extraction followed by GC-MS, were compared. P&T-GC-MS method determined 12 components, including sulfur-containing constituents (such as dimethyl disulfide), nitrogen-containing constituents (such as pyrazine derivatives), aldehydes and ketones. Ethyl acetate extraction fol- lowed by GC-MS method detected 10 components, which were mainly volatile organic acids (such as benzenepropanoic acid) and esters. Neither of the two methods detected alcohols or trimethylamine. This study offers an important reference to determine volatile flavor components of traditional fish sauce through modern analysis methods.
文摘[Objective] The aim was to explore the nutrient status of tobacco-planting soil,and find out the fertilization strategy for flue-cured tobacco. [Method]The nutrient contents in 142 soil samples from 7 tobacco planting counties in Fu Zhou city were determined and evaluated. [Result]The organic matter content was on the high side,and most soil was acid soil. The soil had abundant total nitrogen,total phosphorus and total potassium,moderate available nitrogen and available phosphorus,low available potassium,high water soluble chlorine,low soil cation exchange capacity and rich effective zinc,but effective boron was famine. [Conclusion] The meta-acid soil should be conducted with p H adjustment,and rational nitrogen,phosphorus and potassium application.
基金The research project was sponsored by the NationalDevelopment and ReformCommission of China (20041138) .
文摘Based on detailed logging of fourteen drill holes, combined with the results of other researchers, the preliminary summarization on sedimentary characteristics of the late Pleistocene of the Fuzhou basin is done. The deposition of Fuzhou basin began from about 56.5ka BP and the sediments are composed of gravel, sand, clay and silt, which show a depositional sequence with granularity becoming smaller from the lower to the upper and a big lateral variation of lithology. There are three silt layers in late Quaternary strata of Fuzhou basin. The first and second layers were developed during the middle and late Holocene, the deposition time is about 7.86ka BP to 1.44 ka BP and they are the results of “Changle Transgression". The third was developed during the late of late Pleistocene and the deposition time is from 44ka BP to 20ka BP and it is the result of “Fuzhou Transgression".The buried late Quaternary sediments in Fuzhou basin can be divided into upper Pleistocene series and Holocene series, which include four formations from old to new. They are the Longhai formation (Q^3_pl), Dongshan formation (Qhd), Changle formation (Qhc) and Jiangtian formation (Qhj), respectively. The Longhai formation can be divided into three members and belongs to the Pleistocene series, other three formations belong to the Holocene series.
基金This project was granted bythe National Developmentand Reform Commission.Item Number:20041138
文摘Based on the content of radioactive elements (U, Th, K) of strata in two drill holes in the Fuzhou basin, and combined with the result of spore_pollen analysis, the relationship between radioactivity and lithology and deposit environments is discussed and the results show that the content of radioactive substances is related to the granularity and lithology in sediment, and it is higher in argillaceous sediment (e.g. silt and clay), lower in sand sediment and in the middle in gravels between the above two kinds of sediment. The content of radioactive substances is also related to paleoclimate. A warm and humid environment is propitious to the deposition of radioactive substances, while a cool and dry climate is just the reverse.
