基于主成分分析的大兴安岭高寒区典型火烧迹地土壤质量评价研究

Evaluation of Burned Soil Quality in Typical Alpine Area of Greater Xing'an Mountains Based on Principal Component Analysis

以大兴安岭高寒区典型火烧迹地为研究对象,选取土壤表层(0 cm^5 cm)枯落层厚度、土壤含水率、午间均温、土壤容重、水稳性团聚体、p H等12项表征土壤物理、化学、生物学性质的指标,运用主成份分析方法,对森林土壤质量进行评价。结果显示:林火对所有指标的影响度均达到显著水平(ρ<0.01)。对照林地综合得分(0.194)明显大于火烧迹地综合得分(0.101),表明林火短期内可使森林土壤质量降低。

Taking the typical alpine area of greater Xing'an mountains as the research object, this study selected 12 physical, chemical or biological indexes in the soil surface (0~5 cm), including litter thickness, soil moisture, midday average tempera-ture, soil bulk density, water stable aggregates, pH, to evaluat the burned soil quality using principal component analysis.The results showed that the impact of forest fire on all indicators have reached a significant level (ρ <0.01 ) .The score of control group(0.194) was significantly higher than that of forest fire (0.101), which showed that forest soil quality could be decreased by forest fire in a short time.