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《Resources and Enuironment In The Yangtza Basin》 2002-05
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A STUDY OF FEATURES OF WATER-STABLE SOIL AGGREGATE STRUCTURE UNDER DIFFERENT LAND USE IN KARST MOUNTAINS

LI Yang- bin\+1, XIE De-ti\+1, WEI Chao-fu\+1, ZHOU Bao-tong\+2 (1. College of Resources and Environment Sciences, Southwest China Agricultural University, Chongqing 400716, China; 2. Shcool of Resources and Environment Sciences, Southwest China Norrnal University, Chongqing 400715,China)  
Karst mountain is a typical fragile ecological environment and its soil resource is congenitally deficient and affected by the land use patterns. Choosing Beibei, Qianjiang and Jinfushan as the representative Karst areas of Chongqing City, the distribution and formation of water-stable aggregates in karst soils under different land use has been studied. The results shows that the contents of 0.25 mm water-stable aggregates changes in the following order:shrub grasslandprimitive woodlandsecondary woodland orchardold fieldfarmland.The content of 2mm water-stable soil aggregates is more in the surface and subsurface soils of woodland and shrub grassland than that in orchard,old field and farmland. Either the water-stability of aggregates (especially 2mm ) or the content of water-stable aggregates is highly correlated with the contents of soil organic matter.This result shows that organic matter is the cementation of soil aggregate structure. Increased decomposition and decreased input of organic matter after reclamation of shrub grassland and woodland are responsible for the decrease in both the water-stability of aggregates and the amount of water-stable aggregates in karst soils. The soil aggregate structure may be rehabilitated after returning farmland to woodland or grassland.
【Fund】: 重庆市科委项目 (编号 6 75 9)
【CateGory Index】: S152.4
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