半干旱地区不同油松混交林的油松生长特征及植物多样性研究

以辽西半干旱地区不同类型的油松混交林为研究对象,采用比较分析的方法,综合分析了6种类型林分在层次结构、径阶分布、植物多样性3个方面的特征,旨在选择出适合本地区的最优油松阔叶水土保持林。结果表明:油松-山杏、油松-紫穗槐两种林分具有较好的空间结构层次,油松-山杏、油松-刺槐、油松-紫穗槐3种林分具有较好的径阶生长结构,油松-小叶锦鸡儿、油松-黄栌、油松-紫穗槐3种林分树高与胸径生长最优,油松-紫穗槐、油松-刺槐、油松-黄栌3种林分具有较高的植物多样性。综合各林分类型的生长特征及植物多样性特点,油松-紫穗槐林分为该地区最优的水土保持林类型;油松-刺槐、油松-黄栌水土保持林表现次之;油松-山杏、油松-小叶锦鸡儿林分排在第3位;油松纯林为最差。油松-紫穗槐混交林应成为辽西半干旱地区重点发展的一个水土保持林类型。

Growth Characters and Plant Species Diversities of Chinese Pine for Different Mixed Stands in Semi-arid Area

The objective of this paper is to select the optical mixed water and soil conservation forests,which can service for environment construction in western Liaoning Province.6 types of stands were studied in spatial structure,steps distribution,DBH and height growth and plant species diversities in this paper.The results indicated that the stands of Prunus sibirica-pine(Pinus tabulaeformis) and Amorpha fruticosa-pine had better spatial structure.The stands of Prunus sibirica-pine,Robinia pseudoacacia-pine and Amorpha fruticosa-pine showed better steps distribution.The stands of Caragana microphylla-pine,Cotinus coggygria-pine and Amorpha fruticosa-pine showed better growth in tree height and DBH.The stands of Robinia pseudoacacia-pine,Cotinus coggygria-pine and Amorpha fruticosa-pine showed better plant species diversities.By above analysis,we could conclude that the stand of Amorpha fruticosa-pine was the best in this area.The stands of Robinia pseudoacacia-pine and Cotinus coggygria-pine were worse than Amorpha fruticosa-pine and better than Prunus sibirica-pine and Caragana microphylla-pine.The stand of Chinese pine pure plantation was the worst.The stand of Amorpha fruticosa-pine should be an important stand type in western Liaoning Province.