大兴安岭低质林补植改造效果的综合评价

以大兴安岭阔叶混交低质林为研究对象,对其进行补植改造,补植苗木为兴安落叶松(Larix gmelinii)。通过野外实地取样和室内实验测得各指标数据,选取35个评价指标进行分析,利用主成分分析法建立综合评价模型,计算样地改造效果的综合得分,筛选出最佳的补植改造密度。结果表明:不同样地补植改造后的综合得分由大到小依次为BZ5(0.761)、BZ3(0.351)、BZ6(0.247)、BZ2(0.017)、BZ4(-0.059)、CK(-0.394)、BZ1(-0.923)。其中BZ5改造样地的综合得分最高,补植改造效果最好,表明补植密度为800株·hm~(-2)最适宜大兴安岭阔叶混交低质林的补植改造。

Comprehensive Evaluation on the Effect of Replanting Alterations of Low-quality Forest in Daxing'an Mountains

We studied broad-leaved mixed low-quality forest in Daxing'an Mountains,and the replanting seedlings were Larix gmelinii.The indexes were measured by field sampling and indoor experiment.We selected 35 evaluation indexes,used the principal component analysis method to establish a comprehensive evaluation model,calculated the comprehensive score of the plot transformation effect,and screened out the best replanting density.The comprehensive scores were BZ5 (0.761),BZ3(0.351),BZ6(0.247),BZ2(0.017),BZ4(-0.059),CK(-0.394) and BZ1(-0.923).Among them,the comprehensive score of BZ5 transformation plot was the highest,and the replanting effect was the best,indicating that the planting density of 800 tree · hm-2 was the most suitable for the replanting transformation of low-quality mixed forest in Daxing'an Mountains.