不同林龄人工林对退化生态系统土壤肥力质量的影响

选择黄土高原地区典型人工林为研究对象,以土壤容重、质地、有机质、养分、矿质全量等为指标,对不同恢复时期人工林改良土壤的效应进行了研究,并采用新复极差法分析了有机质及养分含量的差异显著性,最后应用综合指数法进行检验。结果表明:(1)沙棘林中中龄林土壤肥力质量最高,过熟林较低,幼林最低;(2)油松成林和刺槐成林各项肥力指标与其中幼林和撂荒地都呈极显著性差异;(3)同龄刺槐林土壤肥力质量高于油松林。

Effect of Different Age Forests on Soil Fertility Quality of Degraded Ecosystems

We selected the typical artificial forests on the Loess Plateau as study subjects based on the investigation and analysis in the field,measured soil density,organic matter,nutrients and soil mineral elements,by using the DUNCAN method to analyze the difference of organic matter and nutrients,and finally utilized the Integrated Fertility Index method to verify the result.Our objective was to study the effect of the different restoration periods of artificial forests on svil fertility quality.It showed that:(1) soil fertility quality of the middle age hippopHae rhamnoides was highest,the overriping was the second and,the sapling was the lowest;(2) Each fertility index had the significant difference between the mature Pinus tabulaeformis or Robinia pseudoacacia and the saplings or wasteland.;(3) Soil fertility quality of Pinus tabulaeformis was higher than hippopHae rhamnoides when they had the same age.