辽西半干旱区不同类型油松水土保持林土壤改良效应分析

Analyse on Soil Improvement of Different Types of Water and Soil Conservation Forests Mixed with Pinus tabulaeformis in Semi-arid Area of Western Liaoning Province

采用比较、主成分分析等方法对辽西地区几种不同类型油松水土保持林土壤理化性质进行了研究,在分别阐释13项土壤因子特征的基础上,对各种类型林分改良土壤效应进行了综合分析。结果表明:(1)油松混交林无论在改良土壤物理性质,还是化学性质方面都明显优于油松纯林;(2)不同类型油松混交林对土壤理化性质的改良效应是不同的;(3)不同类型林分改良土壤综合指数排序为:油松-紫穗槐混交林>油松-黄栌混交林>油松-刺槐混交林>油松-山杏混交林>油松-小叶锦鸡儿混交林>油松纯林;(4)林分对土壤的改良作用反过来又促进了林木的生长。

For the methods of comparison and PCA analyses, different types of water and soil conservation forests on soil physical and chemical characters were studied in semi - arid area of western Liaoning province. Based on the description of 13 kinds of soil factors, the soil improvements of different stands were stated synthetically. The results showed that mixed stands were better obviously than pure forest of Pinus tabulaeformis on soil improvement both on physics and chemistry. Different types of mixed stands of Pinus tabulaeforrnis showed different on soil improvement. The order of mixed forests in synthetically improving soil properties was following： YZ 〉 YH 〉 YC 〉 YSH 〉 YJ. On the other hand, the growth of trees were promoted by soil improvement.