太行山区常见绿化树种叶片水分组成与耐旱性的相关性分析

选择能适应生态环境的适生造林树种是造林成功的1个关键因素。在太行山区的河北省易县旺龙沟流域,以常见的14种造林绿化树种为研究对象,调查了自然环境下不同树种的主要分布区域;并在各树种的主要分布区,每树种确定10株2～4 a生的幼树,在主干及主枝枝条中部选择成熟叶片作为测定样品,分析了其叶片束缚水/自由水与所处土壤含水量的相关性,进而分析与树种耐旱性的关系,可为该区抗旱造林树种选择提供理论依据。结果表明：不同树种集中分布在丘陵的部位不同;各树种鲜叶的束缚水/自由水与其对应所处土壤的含水量之间存在极显著的负相关关系,即叶片束缚水/自由水越大,植物的耐旱性越强。经过长期自然选择,在丘陵山地上部保留下来的树种具有较强的耐旱性。

Analysis on the Correlation between Leaves Water Composition of Common Greening Trees and Drought Tolerance in Taihang Mountain

It was a key factor for successful afforestion that selecting the adaptive tree species adapted the ecological environment. Taking 14 common afforestation species as the research objects in Wanglonggou Basin of Yi County in Taihang Mountain, the main distribution areas of different species under natural condition were investigated. Choosing 10 trees at 2 -4 years, and taking mature leaves from the trunks and middle of main branch as the samples, the correlation between the ratio of irreducible water to free water in leaves and soil water content, and then their relationship with drought tolerance were analyzed, which could provide theoretical basis for the selection of drought resistant afforestation tree species in the area. The results showed that different tree species distributed in different parts of the hills. There exited a extremely significance negative correlation between the ratio of irreducible water to free water of each leaves and soil water content of their main distribution areas, namely higher the ratio, stronger the drought tolerance. After a long-term natural selection, the species retained in the upper of hilly had stronger drought tolerance.