下蜀主要森林土壤肥力的灰色关联分析与评价

Gray Relation Grades Analyses and Evaluation of Main Forestry-Soil Fertility in Xiashu Ecological Station

根据６种不同森林类型下的凋落物和土壤中微生物数量、营养元素含量及土壤酶活性变化，利用灰色关联分析方法评价了不同森林类型的凋落物及土壤的生物化学性质对土壤肥力状况的影响情况，其结果（关联度）为：栎林（０． ８４１）＞松栎混交林（０． ８１３）＞竹栎混交林（０．７８６）＞毛竹林（０．７７３）＞松林（０．６９０）＞杉木林（０．６８５）。这与下蜀森林定位站长期研究的结果相符，表明该数值化方法对土壤肥力的综合评价是可行的。

By Gray Relation Analysis, soil fertility was evaluated according to the biochemical variation of the microbes quantities, the nutrient contents and the enzyme activities in six types of forestry litters and soils. The conclusion was made as follows: Oak soil＞Pine mixed Oak soil＞Bamboo mixed Oak soil＞Bamboo soil＞Pine soil＞Chinese fir soil warranted by their rela tion grades as 0.841,0.813,0.786,0.773,0.690,0.685. These results were consisten t to the researches of Xiashu Forestry Ecological Station and indicated that thi s method was suitable for the apprehensive evaluation for the soil fertility. In general, this study gives some novel experiences and methods for further res earches on forestry soil fertility.