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不同土地利用方式对岩溶山地土壤团粒结构的影响
引用本文:李阳兵,谢德体.不同土地利用方式对岩溶山地土壤团粒结构的影响[J].水土保持学报,2001,15(4):122-125.
作者姓名:李阳兵  谢德体
作者单位:西南农业大学资源环境学院,
基金项目:重庆市科委资助项目 (编号 :675 9)
摘    要:研究了 5种利用方式对岩溶山地土壤水稳定性团聚体的影响。结果表明 :>0 .2 5 mm水稳定性团聚体为草坡 >林地 >弃耕地 >果园 >耕地 ;林地、草坡的土壤表层和亚表层水稳定性团聚体以 >2 mm为主 ,而果园、弃耕地、耕地土壤 >2 mm的水稳定性团聚体较小。水稳定性团聚体以及团聚的水稳性均与有机质的含量呈正相关 ,林地、草坡开垦后 ,土壤有机质分解加快或补充减少是土壤团聚体水稳定性下降及数量减少的主要原因。坡耕地退耕后 ,土壤团聚体可得到恢复。

关 键 词:岩溶山地  土壤团聚体  土地利用方式
文章编号:1009-2242(2001)04-0122-04

Features of Water-stable Soil Aggregate Structure under Different Land Use in Karst Mountains
LI Yang-bin,XIE De-ti.Features of Water-stable Soil Aggregate Structure under Different Land Use in Karst Mountains[J].Journal of Soil and Water Conservation,2001,15(4):122-125.
Authors:LI Yang-bin  XIE De-ti
Abstract:The distribution and formation of water-stable aggregates in karst soils under different land use were studied. The results showed that the contents of >0.25m m water-stable aggregates changed in the following order:shrub grassland > woo dland > old field > orchard > farmland, and the content of >2mm water-stable so il aggregates is more in the surface and subsurface soils of woodland and shrub grassland than in orchard,old field and farmland. Either the water-stability of aggregates or the content of water-stable aggregates was highly correlated with the contents of soil organic matter. Increased decomposition and decreased input of organic matter after reclamation were responsible for the decrease in b oth the water-stability of aggregate and the amount of water-stable aggregates in karst soils. The soil aggregate structure may be rehabilitated after returni ng farmland to woodland or grassland.
Keywords:karst mountains  soil aggregate  land use pat tern
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