The impact of environmental variables on sediment yield and vegetation recovering prospect in the middle Yellow River
CHEN Hao1,2,FANG Hai-yan2,3,CAI Qiang-guo2,ZHOU Jin-xing4,HUANG Xin2,3(1.Key Laboratory of Soil and Water Conservation & Desertification Combat(Beijing Forest University),Ministry of Education,Beijing 100083,China;2.Key Laboratory of Water Circle and Related Land SurfaceProcesses,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;3.Graduate School of the Chinese Academy of Sciences,Beijing 100049,China4.The Reseach Institute of Forest Science,Chinese Academy of Forestry,Beijing 100091,China)
Soil erosion and eco-environment on the Loess Plateau are among the most serious problems in the world.To improvements of the vegetation coverage and ecological efficiency are the key issues to be settled urgently in future in the context of erosion control and food security.According to the data from the key counties with different spatial locations on the Loess Plateau,the effects of climate,land cover and land use pattern on sediment yield as well as the relationship between sediment yield and environmental variables are studied in this paper.The integrated impact by natural variables and human activities and their weights in influencing sediment yield are also quantitatively analyzed on the Loess Plateau,particularly in the sandy and coarse sandy areas.Furthermore,the adaptive coefficient of eco-water requirement of natural vegetation and the concepts of restoration degree of forest and grass are used to systematically discuss the macro-configuration changes of land use pattern and vegetation restoration prospect in the middle Yellow River,particularly in sandy and coarse sandy areas.Studies indicate that on the Loess Plateau,where the growth of vegetation mainly depends on natural precipitation, biological measure(mainly vegetation type) is required to be in accordance with natural zone,and the restoration and construction of macro-vegetation should adhere to the vegetation restoration degree and its adaptive coefficient of eco-water requirement.With the pressure of growing population,it is a key problem to reconstruct vegetation and crop planting to settle out the contradictions, such as properly dealing with the relationship of economic development and environmental protection,reducing reclamation rate and protecting farmland,planting forest and making grass and their adaptative to precipitation as well the reasonable configuration of biological and engineering measures on the Loess Plateau.
【Fund】： 国家重点基础研究发展计划973项目(2007CB407207);; 国家自然科学基金项目(406350273067172140471085);; 中国科学院地理科学与资源研究所创新三期领域前沿课题(066U0104SZ)
【CateGory Index】： S157
【CateGory Index】： S157