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Conservation and Sustainable Exploitation of Forest Ecosystem in Upper Reaches of the Yangtze River -Case Study on Gongga Mountain
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作者 ZHANG Baohua HE Yurong ZHOU Hongyi CHENG Genwei Institute of Mountain Hazards & Environment, the Chinese Academy of Sciences.Chengdu 610041. China. Department of Geography, Liaocheng University, Liaocheng 252059. China bhz@ imde. ac.cn 《Chinese Forestry Science and Technology》 2003年第1期66-70,共5页
The deforestation on large scale in the upper reaches of Yangtze River has caused serious problems of ecosystem and environment. Restoration of the degenerated forest ecosystems is one of the main research fields. Tak... The deforestation on large scale in the upper reaches of Yangtze River has caused serious problems of ecosystem and environment. Restoration of the degenerated forest ecosystems is one of the main research fields. Taking Gongga Mountain as an example, degeneration features and existing problems of forest ecosystems are analyzed in this paper, and the measures are also proposed. 展开更多
关键词 conservation and sustainable exploitation forest ecosystem upper reaches of the Yangtze River Gongga Mountain
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Estimation of catch losses resulting from overexploitation in the global marine fisheries 被引量:2
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作者 DING Qi CHEN Xinjun +1 位作者 CHEN Yong TIAN Siquan 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第12期37-44,共8页
Many fish stocks in the world are depleted as a result of overexploitation, which reduces stock productivity and results in loss of potential yields. In this study we analyzed the catch trends and approximate threshol... Many fish stocks in the world are depleted as a result of overexploitation, which reduces stock productivity and results in loss of potential yields. In this study we analyzed the catch trends and approximate thresholds of sustainable fishing for fished stocks to estimate the potential loss of catch and revenue of global fisheries as a result of overexploitation during the period of 1950–2010 in 14 FAO fishing areas. About 35% of stocks in the global marine ocean have or had suffered from overexploitation at present. The global catch losses amounted to 332.8 million tonnes over 1950–2010, resulting in a direct economic loss of US$298.9 billion(constant 2005 US$).Unsustainable fishing caused substantial potential losses worldwide, especially in the northern hemisphere.Estimated potential losses due to overfishing for different groups of resources showed that the low-value but abundant small-medium pelagics made the largest contribution to the global catch loss, with a weight of 265.0 million tonnes. The geographic expansion of overfishing not only showed serial depletion of world's fishery resources, but also reflected how recent trends towards sustainability can stabilize or reverse catch losses.Reduction of global fishing capacity and changes in fishery management systems are necessary if the long-term sustainability of marine fisheries in the world is to be achieved. 展开更多
关键词 overfishing catch loss sustainability exploitation status
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Protect the Environment and Speed up the Sustainable Development of Chinese Agriculture
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作者 Chunling Liu 《Chinese Business Review》 2005年第4期61-65,共5页
Strengthening the environmental protection, deepening rural reform, increasing agricultural input, and promoting a more stable and higher-speed growth of peasants' income, all of these are playing a very important ro... Strengthening the environmental protection, deepening rural reform, increasing agricultural input, and promoting a more stable and higher-speed growth of peasants' income, all of these are playing a very important role in the sustainable development of agriculture. The environment problems are not only economic problems, but also important political problems. And they constitute an urgent and arduous task that we meet, and need a long time to be conquered. Under the present new historical circumstances, we should establish a scientific development philosophy, strengthen the environment protection, and build up a harmonious society in which urban and rural areas are progressing coordinately. 展开更多
关键词 environmental protection natural resources exploitation and utilization ecologicalenvironment sustainable development
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Problems for water resources development in typical small karst drainage basins and countermeasures
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作者 WAN Hong-tao, XIE Chuan-jie, SHI Yun-liang (LREIS, Institute of Geographical Sciences and Natural Resources, Chinese Academy of Sciences, Beijing 100101, China, Department of Urban and Resource, Nanjing University Nanjing 210093, China) 《Journal of Geographical Sciences》 SCIE CSCD 2000年第2期168-176,共9页
In karst area water deficit is one of the main factors constraining sustainable economic development. In 1979 the comprehensive karstic observational field station was set up in Houzhai drainage basin located,\ in Pud... In karst area water deficit is one of the main factors constraining sustainable economic development. In 1979 the comprehensive karstic observational field station was set up in Houzhai drainage basin located,\ in Puding county of Guizhou Province, which can represent most of the small karst drainage basins on the dividing line of the Guizhou Plateau. Geomorphology, water resources and water chemistry were investigated and observed. Based on comparisons of water supply with water demand and analysis of the main problems in water exploitation and utilization. it is found out that the water deficiency was not directly caused by the scarcity of natural water resources. The true reason is the insufficient capacity of water supply caused by the dismatch of the water and soil water resources which can be dealt with by building more irrigation works. Some solutions such as to build scientific basis for water exploitation and utilization and sustainable economic development in karst drainage basins on dividing line of the Guizhou Plateau. 展开更多
关键词 small karst drainage basin water resources comparison of water supply and demand sustainable exploitation and utilization
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Edible Peanut Worm(Sipunculus nudus) in the Beibu Gulf: Resource, Aquaculture, Ecological Impact and Counterplan 被引量:10
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作者 LI Junwei XIE Xiaoyong +2 位作者 ZHU Changbo GUO Yongjian CHEN Suwen 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第5期823-830,共8页
Sipunculus nudus is an important economic species because of its high nutritional and medicinal values. The exploitation and utilization of S. nudus primarily occur in the coastal regions of the Beibu Gulf. However, w... Sipunculus nudus is an important economic species because of its high nutritional and medicinal values. The exploitation and utilization of S. nudus primarily occur in the coastal regions of the Beibu Gulf. However, wild resource of S. nudus is rapidly decreasing because of the overexploitation, which has led to considerable developments of artificial breeding techniques. The cultivation scale of S. nudus has increased in response to successful artificial breeding; however, methods for culturing S. nudus in tidal flats or ponds require further study. Most studies have focused on the breeding, nutrition, medical value and ecological impact of these worms. Studies on the distribution, sediment requirements, nutrition characteristics, breeding techniques and aquaculture ecology of this species are summarized in this paper to promote the development of the aquaculture industry for S. nudus. The high biomass of S. nudus in the Beibu Gulf is positively correlated with the sediment characteristics and water quality of the region. The production of peanut worm has improved to some extent through culturing; however, the nutrient value and ecological environment problems have been observed, which reflect the over exploitation of trace elements and the sediment. These problems will worsen unless they are resolved, and the release of organic materials, nitrogen and phosphorus during harvesting impacts the coastal environment. Moreover, genetic erosion is a potential risk for larvae in artificial breeding programs in tidal flats. Therefore, culturing and collecting methods should be improved and the wild resource conservation should be implemented to promote the sustainable development of the peanut worm. 展开更多
关键词 breeding larvae aquaculture tidal nutrition cultivation erosion exploitation sustainable phosphorus
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An assessment of “fishing down marine food webs” in coastal states during 1950–2010
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作者 DING Qi CHEN Xinjun +1 位作者 YU Wei CHEN Yong 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第2期43-50,共8页
Mean trophic level of fishery landings(MTL) is one of the most widely used biodiversity indicators to assess the impacts of fishing. Based on the landing data compiled by Food and Agriculture Organization combined w... Mean trophic level of fishery landings(MTL) is one of the most widely used biodiversity indicators to assess the impacts of fishing. Based on the landing data compiled by Food and Agriculture Organization combined with trophic information of relevant species in Fish Base, we evaluated the status of marine fisheries from 1950 to 2010 for different coastal states in Pacific, Atlantic and Indian Oceans. We found that the phenomenon of "fishing down marine food webs" occurred in 43 states. Specifically, 27 states belonged to "fishing-through" pattern, and 16 states resulted from "fishing-down" scenario. The sign of recovery in MTL was common in the Pacific, Atlantic and Indian Oceans(occurred in 20 states), but was generally accompanied by significantly decreased catches of traditional low trophic level species. In particular, 11 states showed significant declining catches of lower trophic levels. The MTL-based assessment of "fishing down marine food webs" needs to be interpreted cautiously. 展开更多
关键词 coastal states exploitation history fishing down marine food webs sustainability marine fisheries mean trophic level of fishery landings
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From nanoparticles via microtemplates and milliparticles to deep-sea nodules: biogenically driven mineral formation
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作者 Xiao-Hong WANG Ute SCHLOI MACHER +4 位作者 Shun-Feng WANG Heinz C.SCHRODER Matthias WlENS Renato BATEL Werner E.G.MULLER 《Frontiers of Materials Science》 SCIE CSCD 2012年第2期97-115,共19页
Deep-sea minerals in polymetallic nodules and seamount Co-rich crusts are not only formed by mineralization but also by biologically driven processes involving microorganisms (biomineralization). Within the polymeta... Deep-sea minerals in polymetallic nodules and seamount Co-rich crusts are not only formed by mineralization but also by biologically driven processes involving microorganisms (biomineralization). Within the polymetallic nodules, free-living and biofilm-forming bacteria provide the matrix for manganese deposition, and in seamount Co-rich crusts, coccolithophores represent the dominant organisms that act as bio-seeds for an initial manganese deposition. These (bio)minerals are economically important: manganese is an important alloying component and cobalt forms part of special steels in addition to being used, along with other rare metals, in plasma screens, hard-disk magnets and hybrid car motors. Recent progress in our understanding of the participation of the organic matrices in the enrichment of these metals might provide the basis for feasibility studies of biotechnological applications. 展开更多
关键词 polymetallic nodule BIOMINERALIZATION bacteria sustainable exploitation
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Editorial Prerogative and the Plant Genome
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作者 Daniel F.Voytas 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2016年第5期229-232,共4页
In the coming decades,plant agriculture must produce the food needed to sustain the world's burgeoning population.This challenge is made more daunting in light of a changing climate,scarcity of inputs such as water a... In the coming decades,plant agriculture must produce the food needed to sustain the world's burgeoning population.This challenge is made more daunting in light of a changing climate,scarcity of inputs such as water and fertilizer,and the need to grow more crops on increasingly marginal land.To achieve food security,we will need to fully exploit plant genetics to develop new crop varieties that produce higher yields of healthier food. 展开更多
关键词 agriculture fertilizer scarcity Genome breeding sustain exploit genetics editing template
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