新疆林业生态环境中的木垒胡杨林群落特征研究

对新疆林业生态环境中木垒胡杨林群落的多样性特征进行研究,分析胡杨林群落的相似度变化趋势,通过个体数对数和失稳率研究胡杨林的结构与动态特征。结果表明:在多样性特征中,中、下游区域临界点的胡杨林群落丰富度最高,中游区域的丰富度最小;生态输水前,下游区域的胡杨林群落均匀度指数最小,中游区域的均匀度指数最大,生态输水后,中、下游区域临界点处的均匀度指数最大,下游区域的均匀度指数最小;生态输水后的物种多样性高于生态输水前的物种多样性,下游区域的物种多样性受生态输水的影响较小;在相似性特征中,Jaccard 指数和Sorenson 指数在不同区域内的变化趋势相似;在胡杨林结构与动态特征中,胡杨林种群在上游区域中的数量较多,种群的个体数与高度级呈反比。

Characteristics of Populus euphratica Community of Mulei in Forest Ecological Environmentof Xinjiang

The diversity characteristics and the similarity trend of Populus euphratica communities in forestryecological environment were studied. The structure and dynamic characteristics of Populus euphraticaforests were analyzed through logarithmic individual numbers and instability rates. The results showedthat in the diversity characteristics, the richness of Populus euphratica communities near the boundarypoints in the midstream and downstream areas was the largest, while the richness in the midstream regionswas the smallest; before ecological water transfer, the evenness index of Populus euphratica communitieswas the smallest in the downstream areas but was the largest in the midstream areas, while after ecologicalwater transfer, the evenness index was the largest near the boundary points in the midstream and downstreamareas but was the smallest in the downstream areas; the species diversity after ecological watertransfer was higher than that before ecological water transfer, and the species diversity in downstream are as was less affected by ecological water transfer; in the similarity characteristics, the variation trends ofJaccard index and Sorenson index in different regions were similar; in the structure and dynamic characteristics,the number of Populus euphratica communities in the upstream area was relatively large, and thenumber of individuals was inversely proportional to the height level.