小兴安岭用材林土壤肥力综合评价及评价方法比较

Comprehensive Evaluation and Method Comparison of Timber Forest Soil Fertility in Xiaoxing'an Mountain

以小兴安岭带岭林业局用材林为研究对象,在天然林内设置6块间伐强度不同的样地（强度依次为10%、15%、20%、25%、30%、35%）,每块样地设置4种间伐带（6、10、14、18 m）。在各间伐带内采集土壤样本,测定土壤化学性质,分析不同间伐强度、不同间伐带宽对土壤肥力的影响;运用基于熵权法的灰色关联模型,综合评价小兴安岭用材林土壤肥力。结果表明：改造的样地中,最有利于土壤养分积累的是间伐强度25%~30%、间伐带宽为10 m。与灰色关联法、主成分分析法、熵权理想解法比较表明：基于熵权法的灰色关联模型用于土壤肥力评价,合理可行。

With the timber forest in the Dailing Forestry of Xiaoxing＇ an Mountain, we set different samples of six thinning intensities in the natural forest （ 10%, 15%, 20%, 25%, 30%, and 35%） , and each sample was with 6 m, 10 m, 14 m and 18 m bandwidth. Taking soil samples in the thinning zone, we determined its chemical properties and analyzed the effect of different thinning intensities and different bandwidths on soil chemical properties by grey correlation model with entropy weight to evaluate soil fertility of Xiaoxing＇ an Mountain timber forest. All modification in the sample area, the most beneficial manageable way to the accumulation of soil nutrients is 25%-30% thinning intensity and the 10 m bandwidth. Compared with grey correlation analysis, the principal component analysis method and entropy .weight ideal solution, the grey correlation model with entropy weight method in soil fertility evaluation is feasible.