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《Journal of Glaciology and Geocryology》 2003-04
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Impacts of Land Use Change on Environment in the Middle Reaches of the Heihe River

WANG Gen-xu+{1, 2}, MA Hai-yan+1, WANG Yi-bo+2, CHANG Juan+2 (1. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu730000, China; 2. Education Ministry KeyLaboratory of Western Environmental Science, Lanzhou University, Lanzhou Gansu 730000, China)  
Physical, chemical and environmental consequences due to land use changing from cultivated land to desert grassland or vice-versa were monitored in the middle reaches of the Heihe River, one of the largest inland basins of arid northwest China. The measurements include soil quality change, soil organic carbon loss, N and P loads in surface waters, amongst others. In the first 3~5 years of cultivation the soil nutrient content of various former grasslands, including mountain-meadow and plains-meadow grasslands, decreases significantly. After some 10 years of cultivation, soil nutrient content in former mountain meadow grasslands remains unstable, whereas that in desertified grassland, where cultivation has simply been abandoned, shows a slight increase. Under the latter condition, N and P in soil lose at a rate of 4.68 Mg·hm+{-2}·yr+{-1} and 6.78 Mg·hm+{-2}·yr+{-1}, respectively, over a 13-years period. The transformation of grassland into cultivated land and that of cultivated land into desert grassland results in organic carbon emission of 1.68 tg C and 0.55 tg C, respectively, over 10 years. Land use change in the arid inland regions clearly has a significant influence on the soil organic carbon pool and carbon cycle. Drops in soil N and P lead to 63.3% and 34.1% mean enrichment of N and P, respectively, in the downstream water, and then cause a serious environmental problem for the inland regions of Northwest China.
【Fund】: 国家自然科学基金项目 (40 1710 0 2 ) ;; 中国科学院知识创新工程重大项目 (KZCX0 1 0 9)资助
【CateGory Index】: X171.1
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