Phytosociological study of steppe vegetation in east Kazakhstan
Phytosociological study of steppe vegetation in east Kazakhstan
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DOI：
10.1111/j.1744-697x.2007.00090.x
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发表时间：
2007-09-01
影响因子：
1.3
通讯作者：
Nakamura, Toru
中科院分区：
文献类型：
--
作者：
Cheng, Yunxiang;Nakamura, Toru
根据植物社会学方法，从哈萨克斯坦东部草原地区的74个林分收集了植被数据，包括阿拉木图、巴夫洛达尔和塞米巴拉金斯克省。去除趋势对应分析（DCA）被用来提取的主要成分梯度的74个立场。在哈萨克斯坦东部，四个草原植被群落的物种组成的基础上确定。物种组成DCA的第一排序轴与Kira温暖指数的降低（r = 0.84，P < 0.01）和Koppen P/E比值的增加（r = 0.70，P < 0.01）相关。第二个轴是与群落内的演替趋势，由于不同的人类活动。我们确定了与气候因素的强相关性，表明温度和降水可能会影响东哈萨克斯坦草原的物种组成，而不管人类活动。然而，物种组成受到人为干扰的影响，特别是在巴夫洛达尔省年平均降水量低于300 mm的恶劣环境中。
Following phytosociological methods, vegetation data were collected from 74 stands in the steppe area of east Kazakhstan, including Almaty, Pavlodar and Semipalatinsk Provinces. Detrended correspondence analysis (DCA) was used to extract the main compositional gradients of each of the 74 stands. In east Kazakhstan, four steppe vegetation communities were identified based on their species composition. The first ordination axis produced by DCA of species composition was associated with a decreasing Kira's warmth index (r = 0.84, P < 0.01) and an increasing Koppen P/E ratio (r = 0.70, P < 0.01). The second axis was associated with succession trends within the community as a result of different human activities. We identified a strong correlation with climatic factors, indicating that temperature and precipitation may influence the species composition of the east Kazakhstan steppe irrespective of human activities. Species composition, however, is affected by human disturbance, especially in such a severe environment where mean annual precipitation is below 300 mm in Pavlodar Province.