不同诱导改造后大兴安岭蒙古栎低质林土壤养分的灰色关联评价

Grey Correlation Evaluation of Soil Nutrients to Quercus mongolica Low-Quality Forest in Daxing'an Mountains after Different Induced Transformation

对大兴安岭蒙古栎低质林进行不同面积的带状和块状皆伐后,种植樟子松、西伯利亚红松、落叶松进行诱导改造,采用灰色关联分析法对各诱导改造样地和对照样地的土壤养分建立综合评价模型。结果显示:和对照样地相比,诱导改造后各样地的土壤养分在总体上均有所上升;块状改造比带状改造更能有效提高林地土壤养分,其中20 m×20 m林窗改造方式最有利于土壤养分的积累,最适宜大兴安岭蒙古栎低质林的改造;采用灰色关联分析法对土壤养分建立评价模型,不但简单可靠,而且模型具有通用性,稍加修改便可对其他区域的土壤养分进行比较评价。

An evaluation was conducted to do the clear-cutting in Quercus mongolica low-quality forest of Daxing＇an Mountains with different area of the strip and block and perform the induced transformation by planting Mongolica Litv,Pinus koraiensis and Larix gmelinii.The soil nutrient evaluation model in the induced transformation zone and the check zoon were established by using the grey correlation analysis.Compared with the check zoon,the soil nutrient in the induced transformation zone can rise in general.The block transformation can improve the land soil nutrient of low-quality forest effectively rather than the strip transformation and the 20 m×20 m forest gap is the best way to accumulate soil nutrient.Therefore,the block transformation is the most suitable way to transform the Quercus mongolica low-quality forest in Daxing＇an Mountains.It is simple and reliable to establish the soil nutrient evaluation model by using grey correlation analysis.The model can compare and evaluate soil nutrients of other areas with minimal modifications.