南疆喀什吴屯杨的引种研究

农田防护林是南疆三大生态安全屏障的重要组成部分。为优化南疆防护林体系结构、提高生物多样性和生态防护效果,以引种到南疆喀什地区的吴屯杨和新疆乡土树种新疆杨为研究材料,采用样地调查法对不同立地条件下的2种杨树的树高、胸径、保存率和累积生长量进行调查研究。结果表明,在3个试验样地中,吴屯杨的平均胸径均高于新疆杨,2种杨树的平均树高无显著差异。造林3年内2种杨树的树高累积生长量上升速度较快,栽植2年后,吴屯杨的胸径累积生长量高于新疆杨。在含盐量高达0.76%的伽师县,吴屯杨的保存率仍达到37.37%,高于新疆杨,说明吴屯杨的耐盐能力比新疆杨强,且吴屯杨的生长状况优于新疆杨。本研究为吴屯杨在南疆大面积推广种植提供了实践依据。

Introduction of Populus wutunensis in Southern Xinjiang

The shelter forest for farmland is the important component for three largest ecological safety barriers of southern Xinjiang. In order to optimize the shelter forest system structure of southern Xinjiang and improve the biodiversity and ecological protection effect, the investigation was carried out against tree heights, chest height diameters, survival rates and accumulative growth amounts of two kinds of poplars (investigation materials of this investigation, namely, populus wutunensis introduced to Kashgar region of southern Xinjiang and populus bolleana, one native tree of Xinjiang) under different site conditions adopting the sample-plot survey. Results show that all average values of chest height diameters for populus wutunensis are higher than that of populus bolleana, and there is no significant difference between average tree height values for two kinds of poplars in 3 experimental places. Within three years after plantation, the tree heights and accumulative growth amounts for two kinds of poplars rise faster. After plantation for two years, the chest height diameter and accumulative growth amount of populus wutunensis are higher than that of populus bolleana. The survival rate of populus wutunensis can be still up to 37.37% at Jiashi County (salt content up to 0.76%), which is higher than that of populus bolleana; it shows that the salt-tolerance ability of populus wutunensis is stronger than that of populus bolleana, and the growth status of populus wutunensis is better than that of populus bolleana. This investigation provides practical basis for large-area promotion and cultivation of populus wutunensis at southern Xinjiang.