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Spatial distribution of surface rock fragment on hillslopes in a small catchment in wind-water erosion crisscross region of the Loess Plateau

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Science china Earth sciences 2008年第6期51卷 862-870页

作者： zhu yuanjun1,2.& shao mingan1 1 institute of soil and water conservation, {2. Academy of sciences and ministry of water resources, northwest agriculture and forestry university, yangling 712.00, china 2.institute of Geographical sciences and Natural resources Research, {2. Academy of sciences, Beijing 100101, china 1. institute of soil and {2. conservation Chinese Academy of Sciences and Ministry of Water Resources Northwest Agriculture and Forestry University Yangling 712100 China 2. institute of Geographical sciences and Natural {2. Research Chinese Academy of Sciences Beijing 100101 China

The cover and size distributions of surface rock fragment in hillslopes were investigated by using digital photographing and treating technique in a small catchment in wind-water erosion crisscross region of the Loess Plateau. The results indicated that the maximal cover of rock fragment was pre-sented at mid-position in steep hillslope. Rock fragment presented a general decreasing-trend along the hillslope in gentle hillslope. Rock fragment cover was positively related to gradient, rock fragment size decreased generally along the hillslope, and the size reduced with the gradient. The mean size of rock fragment was at a range of 6―2. mm in the steep hillslope, rock fragment size > 50 mm was rarely presented. The covers of rock fragment at different positions were markedly related to the quantities of rock fragment 2.50 mm accounted for 60% or more of the total area, dominating the distribution of rock fragment in the hillslopes.

关键词： wind-water erosion crisscross region of the Loess Plateau small catchment hillslope surface rock fragment cover and size

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Policy development for sustainable soil water use on{2.’s Loess Plateau

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Science Bulletin 2020年第24期65卷 2053-2056,M0004页

作者： Xiaoxu Jia Ming'an shao Xiaorong Wei yuanjun {2. Yunqiang Wang Wei Hu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of resources and Environment University of Chinese Academy of SciencesBeijing 100190China State Key Laboratory of soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling 712100China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China New Zealand institute for Plant&Food Research Limited Christchurch 8140New Zealand

As the birthplace of the chinese civilization, china’s Loess Plateau(CLP) has an area of ~640,000 km2.and supports a population of more than 100 million people. It has a history of intensive {2. more than 1000 years. The loess deposit of CLP is the largest and deepest in the world. The abundance of silt grains in the loess deposit makes it relatively homogeneous, porous and prone to soil erosion.

关键词：黄土高原土壤 soil loess

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