Spatial pattern analysis is the core component in landscape ecology research.We analyzed the landscape pattern and dynamic process of the Kubuqi Desert by using a typical region as a study area.This study area include...Spatial pattern analysis is the core component in landscape ecology research.We analyzed the landscape pattern and dynamic process of the Kubuqi Desert by using a typical region as a study area.This study area includes four towns;ShuLinZhao,WangAiZhao,BaiNiJing and JiGeSiTai.The area of cropland,fixed sand dune,woodland,residential area and wetland increased and centralized gradually,while the area of semi-fixed sand dune,drifting sand dune,meadow and washland decreased and dispersed gradually from 1987 to 2003.On the landscape level,the patch shape tended to be regular,and the landscape pattern tended to be simple,causing the fragmentation degree,heterogeneity and diversity of the landscape to decrease.Fixed sand dune.Semi-fixed sand dune,drifting sand dune,meadow and river flood plains were the five main export classes,and residential area,cropland and wetland were the three main import classes.The classes that had a relatively large total area and large average patch area had a smaller extent of gravity center migration,whereas the classes with small total area and small average patch area had a larger extent of gravity center migration;this is because the small patches are easily influenced by human activities or natural factors.In addition,the desertification area and desertification degree reduced gradually in the study area during the period from 1987 to 2003.展开更多
采用热扩散探针法,于2021年5—10月对库布齐沙漠小叶杨(Populus simonii)和新疆杨(Populus alba var.pyramidalis)树干液流进行观测,在生长季同步监测其气象因子、土壤水分等指标,分析小时、日和月尺度下树干液流对环境因子(空气温度、...采用热扩散探针法,于2021年5—10月对库布齐沙漠小叶杨(Populus simonii)和新疆杨(Populus alba var.pyramidalis)树干液流进行观测,在生长季同步监测其气象因子、土壤水分等指标,分析小时、日和月尺度下树干液流对环境因子(空气温度、相对湿度、饱和水汽压差、太阳辐射、风速、土壤含水量、降雨量)的响应关系。研究结果如下:(1)新疆杨总耗水量(1059.43 kg)高于小叶杨(947.30 kg)。(2)小时尺度上,小叶杨和新疆杨液流速率均与空气温度、相对湿度、饱和水汽压差、太阳辐射、风速、土壤含水量和降雨量等7个环境因子呈极显著相关;日尺度上,两树种液流速率均与空气温度、相对湿度、饱和水汽压差、太阳辐射、风速和土壤含水量等6个环境因子呈极显著相关;月尺度上,小叶杨液流速率与饱和水汽压差、太阳辐射和土壤含水量呈极显著相关,新疆杨液流速率与空气温度、饱和水汽压差和太阳辐射呈极显著相关。(3)建立时间尺度树干液流与环境因子的关系,小时尺度上,小叶杨入选因子依次为空气温度、土壤含水量、饱和水汽压差和太阳辐射,新疆杨入选因子包括太阳辐射、空气温度等7个因子,树干液流的解释率分别为74.9%、75.6%;日尺度上,小叶杨入选因子依次为土壤含水量、空气温度和风速,新疆杨入选因子包括太阳辐射、空气温度、土壤含水量和风速,树干液流的解释率分别为84.3%、80.9%;月尺度上,太阳辐射和风速是小叶杨液流速率的主要影响因子,2个因子可以共同解释小叶杨液流速率变化的99.5%,饱和水汽压差对新疆杨液流速率的影响最大,单独能够解释新疆杨液流速率变化的91.8%。(4)在较小时间尺度上(小时),液流适宜采用仪器直接测定,在大时间尺度上(日、月)可监测环境因子来估算出2个树种的蒸腾耗水量。展开更多
This study was carried out to reveal the seasonal dietary variation of striped hamster (Cricetulus barabensis ) in Kubuqi desert of Ordos semi-arid environment in 1996.The food composition was determined by checking s...This study was carried out to reveal the seasonal dietary variation of striped hamster (Cricetulus barabensis ) in Kubuqi desert of Ordos semi-arid environment in 1996.The food composition was determined by checking stomach and pouch contents.The results showed that striped hamster ate more insects and seeds than other foods in spring.The food habit changed to plant leaves and seeds in summer.In autumn the food content was mainly seeds.The animal chose perennial and annual seeds alternatively between summer and autumn.This indicated that the food habit was modified by the availability of food resources and animals’need for water and energy in this arid environment.展开更多
基金Talent Training Program in west China of Chinese Academy of Sciences and the Key Research Program of the Chinese Academy of Sciences(KZZD-EW-04)
文摘Spatial pattern analysis is the core component in landscape ecology research.We analyzed the landscape pattern and dynamic process of the Kubuqi Desert by using a typical region as a study area.This study area includes four towns;ShuLinZhao,WangAiZhao,BaiNiJing and JiGeSiTai.The area of cropland,fixed sand dune,woodland,residential area and wetland increased and centralized gradually,while the area of semi-fixed sand dune,drifting sand dune,meadow and washland decreased and dispersed gradually from 1987 to 2003.On the landscape level,the patch shape tended to be regular,and the landscape pattern tended to be simple,causing the fragmentation degree,heterogeneity and diversity of the landscape to decrease.Fixed sand dune.Semi-fixed sand dune,drifting sand dune,meadow and river flood plains were the five main export classes,and residential area,cropland and wetland were the three main import classes.The classes that had a relatively large total area and large average patch area had a smaller extent of gravity center migration,whereas the classes with small total area and small average patch area had a larger extent of gravity center migration;this is because the small patches are easily influenced by human activities or natural factors.In addition,the desertification area and desertification degree reduced gradually in the study area during the period from 1987 to 2003.
文摘This study was carried out to reveal the seasonal dietary variation of striped hamster (Cricetulus barabensis ) in Kubuqi desert of Ordos semi-arid environment in 1996.The food composition was determined by checking stomach and pouch contents.The results showed that striped hamster ate more insects and seeds than other foods in spring.The food habit changed to plant leaves and seeds in summer.In autumn the food content was mainly seeds.The animal chose perennial and annual seeds alternatively between summer and autumn.This indicated that the food habit was modified by the availability of food resources and animals’need for water and energy in this arid environment.
