土地利用方式变化对土壤养分与有机碳、氮的影响

对云南省双江县不同土地利用方式下的表层土壤进行的实地调查研究表明:随土地利用方式从自然林地(对照)变为灌丛草地、经济林地、农耕地,土壤自然含水量、pH值和水解N、速效P、速效K含量逐渐降低,且部分达到显著水平(p0.05),变化程度为农地经济林地灌草地自然林地,土壤SOC、TN含量也明显降低并达到显著水平(p0.05)(除灌草地SOC外),土壤碳密度相应减小。

Influence of Land Use Types to Nutrients, Organic Carbon and Organic Nitrogen of Soil

The paper carries out field investigation on surface soil under different land use types of Shuangjiang County in Yunnan Province.The outcomes show that along with the ways of land use changing from natural forest land(for check) to shrub-grassland,economic forest and cultivated land,the natural water content and the contents of pH value,hydrolysis N,available P and available K of soil are decreased gradually,and some of them decrease remarkably(p<0.05).The variation degree is cultivated land > economic forest > shrub-grassland >natural forest land.The contents of soil organic carbon(SOC) and total nitrogen(TN) of soil are also significantly decrease(p<0.05) except the SOC of shrub-grassland.In the meanwhile,the carbon density of soil decreases correspondingly.