火干扰对重庆针阔混交林土壤理化性质的影响

On Influences of Fire Disturbance on Soil Properties of Coniferous and Broad-leaved Mixed Forests in Chongqing

通过测定重庆茅庵林场针阔混交林内未火烧样地、低强度火干扰样地以及高强度火干扰样地的土壤理化性质,研究了不同强度火干扰对重庆针阔混交林土壤理化性质的影响.并基于主成分分析法,利用各个理化指标计算出土壤肥力综合指数,定量化评价不同强度火烧样地土壤肥力的差异状况.结果表明,火干扰1年后,茅庵林场针阔混交林内表层土壤的体积质量升高,有机质、总氮及有效氮含量降低,土壤综合肥力指数下降.

In this study we have firstly test soil physical‐chemical properties in high ,mid and low fire severity stands of coniferous and broad‐leaved mixed forests in Maoan forestry station ,Chongqing .Then we have used IFI to evaluate the integrated soil fertility to examine the influences of different fire disturbance severity on soil proper ‐ties .By statistically comparing the measured properties ,we have found that 1 year later ,for the surface soil in burned stands ,bulk density increased while organic matter ,total N and available N decreased ,as well as the deg‐radation of integrated fertility index .