小兴安岭低质林不同改造模式土壤肥力的综合评价

摘要

An experimentwas conducted to focus on the Xiaoxing ’ an Mountain low-quality forest alteration by logging .The grey system was used to theoretically analyze the soil fertility indexes of the low-quality forest after the low-quality forest altera-tion in different ways (different cutting intensity of transformation, different bandwidth strip reform) transformation.By the comprehensive evaluation of soil fertility in different horizontal clear-cutting zones after the transformation with grey correla-tion, all methods of alteration showed positive effects on the soil fertility.The best bandwidths of horizontal transformation and vertical clear-cutting mode are 8 m and 10 m, respectively , while 41%is the best reconstruction method among differ-ent intensitiesof the transformation methods.Under the soil fertility indexes of the low-quality forest after thelow -quality forest alteration in different waystransformation , the horizontal clear-cutting is the best method followed byselective felling and the vertical clear-cutting.%以小兴安岭低质林为研究对象，通过对低质林进行不同采伐强度、不同横山带宽、不同顺山带宽3种模式进行改造，应用灰色关联度法综合分析不同模式改造后的低质林样地土壤肥力的各个指标。研究表明，所有的改造模式对土壤肥力均有改善作用。低质林顺山和横山带状改造模式最佳的带宽分别是8 m和10 m；在不同的采伐强度的择伐改造模式下，41％明显优于其他择伐强度改造模式。综合评价不同改造模式土壤肥力质量的改造效果，顺山带状改造模式最优，不同采伐强度的择伐改造模式优于横山带状改造模式。