林火对云南松林土壤性质的影响

作者研究了林火对云南松林区土壤理化性质的影响，结果表明，林火对土壤性质有一定的影响，经检验，差异显著．在中、弱度林火的云南松林中，林火前期土壤结构变化不大，表现出容重略有降低，总孔隙度增大，土壤ｐＨ值增加，有机碳和全氮含量减少，速效钾增加等规律．

Influence of Fire on Soil Property Under the Canopy of Yunnan Pine

This article concentrates on the impact of weak to moderate surface fire on the physical and chemical properties of soil under the canopy of Yunnan pine(Pinus vunnanensis)inXichang district in order to match the research on the appraising technique of monitoring,It isshown in the research that forest fire affects the physical and chemical properties of soiI to a cer-tain extent,and the difference is significant.Under the stock of Yunnan pine disturbed by a con-trolled burning,the change of soil is not too much in the ealy stage after the burning, indicatedby slightly decrease in bulk density of soil,increase in total porosity. The result is consistent withthat reported both at home and abroad.