泸沽湖流域土地利用方式对土壤肥力的影响

Effects of land use types on soil fertility in Luguhu watershed

为探讨泸沽湖流域不同土地利用方式对土壤肥力的影响,采用野外调查、取样和室内分析相结合的方法,对泸沽湖流域内3种主要土地利用方式(农田、草地、林地)的土壤理化性状进行对比分析。结果表明:(1)土地利用类型对土壤肥力影响明显,农田含水率、全氮、速效氮、速效磷和速效钾含量相对较高;(2)林地有机质含量相对较高,草地全磷全钾含量相对较高;(3)土壤养分含量与土壤颗粒组成之间有一定的相关性,其中土壤全磷与砂粒呈显著正相关,土壤速效氮含量与粉粒呈显著负相关。

By the method of soil sampling and laboratory analysis,effects of different land use types on soil fertility have been discussed in this paper.Three main types of land use including farmland,grassland and forestland in Luguhu watershed,Yunnan,China,have been selected,and soil physical and chemical propeties have been studied.The results are as follows：（1） The different land use types have significant impacts on soil fertility.Soil water content,total N,hydrolysable N,available P and available K are relatively higer in farmland.（2） Organic matter is higer in forestland,while total P and total K are higer in grassland.（3） Soil total N has significant positive correlation with soil sand（〉0.02mm）,while soil total K has significant negative correlation with soil silt（0.002-0.020mm） at 95% level.