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《RESOURCES AND ENUIRONMENT IN THE YANGTZA BASIN》 1998-03
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THE RESTORATION AND RECONSTRUCTION OF DEGRADED SOILS IN THE THREE GORGE RESERVOIR AREA

Zhang Jiaen (South China Agricultural University, Guangzhou,510642) Xu Qi (Institute of Soil Science ,The Chinese Academy of Sciences, Nanjing,210008)  
Three gorge reservoir areas are typical mountainous regions with fragile eco environment and intense population pressure. Because of long term over burden, over cultivation and disturbance, soils in the area were degraded heavily. It is very necessary to restore these degraded soils in order to keep up sustainable development. The restoration or reconstruction includes the rehabilitation of recovery of soil structure, nutrients and soil environment. In this paper, the standards of soil structure, nutrients and environment for restoration are given. The thickness of soil should be more than 50cm; phosphor and potassium are main objects of soil nutrent restoration in the studied area; soil environment reconstruction includes the increase of the soil surface coverage and percentage of forest cover(the standard of forest cover ≥ 41%), and the reconstruction of relief and slope. On the other hand,the countermeasures for soil restoration are as follows: (1) strengthen the construction of basic farmlands to control water and soil loss; (2) establish complex agroecosystems for slope lands; (3) optimize the proportion of fertilizer application, increase organic fertilizer; (4) conduct the project of soil transfer from the land soon to be submerged by the reservoir water.
【Fund】: 国务院三峡建设委员会资助
【CateGory Index】: S156
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