作者：周洪华;李卫红;陈亚宁;俆远杰;

机构：中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室;

中文关键词：乌孙山;;游动分割窗技术;;海拔;;植被;;分布格局

英文关键词：Wusun Mountain;moving split window technique;elevation;plant;distribution pattern

中文摘要：结合野外调查结果,以1 410～2 960m海拔梯度上的群落物种重要值和个体数为数量指标,采用游动分割窗技术定量判定了伊犁乌孙山北坡植被垂直分布格局。结果表明,平方欧式距离、马氏距离和Bray-Curtis距离系数均能较好指示群落交错带的变化类型、位置和宽度,其中,平方欧式距离和马氏距离更能直观而准确地反映植被沿海拔梯度的变异,且8个取样单位为游动分割窗最适窗体宽度。利用游动分割窗技术的定量分析,可以将伊犁乌孙山植被沿海拔梯度划分为11个植被带,从低到高依次为:荒漠草原、荒漠草原与山地草原交错带、山地草原、山地草原与亚高山草甸交错带、亚高山草甸、亚高山草甸与高山草甸交错带、高山草甸、高山草甸与针叶林交错带、针叶林、针叶林与高寒草甸交错带以及高寒草甸。荒漠草原与山地草原交错带、山地草原与亚高山草甸交错带、亚高山草甸与高山草甸交错带为渐变型过渡带,宽度分别为250、100、100m,高山草甸与针叶林交错带和针叶林与高寒草甸交错带为急变型过渡带,宽度分别为150m和100m。

英文摘要：Based on field investigation into community important values and the species numbers along elevation gradient from 1 410 m to 2 960 m on the north slope of Wusun Mountain in Yili River Basin of Xinjiang,the altitudinal pattern of plants distribution was discussed by means of the moving split-window technique.The results showed the distance coefficients,such as Squared Euclidean Distance,Mahalanobis Distance and Bray-Curtis Distance can all indicate types,location and width of the community ecotones,especially the Squared Euclidean Distance and Mahalanobis Distance were the best indices showing the variation of plants distribution along the elevation gradient.Calculation using the moving split window technique with different window width suggested 8 plots were the best window width.According to the result from the moving split window calculation,the plant communities on the north slope of Wusun Mountain were classified as 11 types along elevation gradient from the low to the high,as follows: desert steppe,the ecotone between desert steppe and mountain pasture,mountain pasture,the ecotone between mountain pasture and subalpine meadow,subalpine meadow,the ecotone between subalpine meadow and alpine meadow,alpine meadow,the ecotone between alpine meadow and needle-leaved forest,needle-leaved forest,the ecotone between needle-leaved forest and high cold meadow,and high cold meadow.The ecotones between desert steppe and mountain pasture,mountain pasture and subalpine meadow,as well as subalpine meadows and alpine meadow are gradual ecotones,which spanned 250 m,100 m and 100 m,respectively;The ecotones between alpine meadow and needle-leaved forests,as well as needle-leaved forests and high cold meadow are abruptly-changing ecotones,which spanned 150 m and 100 m,respectively.

[中文刊名]：中国沙漠 [出版日期]：2011-07-15 [CN]：62-1070/P [ISSN]：1000-694X

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