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当前位置: 首页 > 文章 > 云冷杉林和针阔叶混交林a-多样性的尺度效应与分形特征 甘肃农业大学学报 2005,40 (1) 1-6
Position: Home > Articles > Scale effection and its fractal characteristics about a-diversity in Picea-Abies forests and coniferous broad-leaved mixed forests Journal of Gansu Agricultural University 2005,40 (1) 1-6

云冷杉林和针阔叶混交林a-多样性的尺度效应与分形特征

作  者：
韩庆杰;孙学刚;杨龙;韩国君;王德君
单  位：
甘肃省莲花山国家级自然保护区管理局;甘肃农业大学林学院
关键词：
云冷杉林;针阔叶混交林;a多样性;尺度效应;分形特征
摘  要：
具有环境梯度或小尺度生境异质性的群落,a 多样性在不同尺度及不同空间位置上的测定结果将存在差异。基于甘肃省莲花山国家级自然保护区 2条长 420 m、宽 10 m样带的群落调查数据,采用分形理论和方法研究了云冷杉林和针阔叶混交林群落 a 多样性测度随空间尺度变化的效应,以及 a 多样性测度与取样尺度之间的分形关系。结果表明:1)随着取样尺度逐步扩大,云冷杉林和针阔叶混交林群落物种丰富度指数和Shannon 指数值先急剧增长后趋于平稳,表现出一定范围内尺度对样带 a 多样性测度具有强烈影响。综合物种丰富度指数和Shannon 指数尺度变化曲线的估计,云冷杉林样带 a 多样性研究比较适宜的取样尺度为 60 m,而针阔叶混交林样带为 90 m,即云冷杉林样带上比较适宜的取样尺度明显小于针阔叶混交林样带;2)针阔叶混交林样带上 a 多样性与取样尺度之间的分形关系比云冷杉林样带更趋于多变,表明针阔叶混交林物种组成的空间异质性高于云冷杉林。
译  名：
Scale effection and its fractal characteristics about a-diversity in Picea-Abies forests and coniferous broad-leaved mixed forests
作  者：
HAN Qing-jie1, SUN Xue-gang1,YANG Long1,HAN Guo-jun1,WANG De-jun2 (1. College of Forestry, Gansu Agricultural University, Gansu, Lanzhou 730070; 2. Lianhua Mountain Nature Reserve Bureau, Gansu, Kangle 731516, China )
关键词：
Picea-Abies forest;coniferous broad-leaved mixed forest;a-diversity;scale effection; fractal characteristics
摘  要：
There are differences of a-diversity at different scales and different places in a community with environmental gradient or small-scale habitat heterogeneity. The a-diversity on different spatial scales and the fractal power-law relationship between a-diversity and sample size in the Picea-Abies forests and coniferous broad-leaved mixed forests at the Lianhua Mountain National Nature Reserve in Gansu Province, were studied by using the datas derived from two transects of 420m length and 10m width. The results showed that species richness indexes and Shannon indexes of the Picea-Abies forests and coniferous broad-leaved mixed forests abruptly increased at the beginning and then kept steady while scale enlarged, indicating the strong influence of scale on a-diversity in some scale ranges on the transects. The sampling scales of a diversity on the transects should be 60m for the Picea-Abies forests and 90m for coniferous broad-leaved mixed forests, based on the scale changing curve of species richness indexes and Shannon indexes, indicating that the sampling scale of a-diversity on coniferous broad-leaved mixed forest transect was obviously greater than that on Picea-Abies forest transect. The fractal power-low relationship of a-diversity index versus sample scales on coniferous broad-leaved mixed forest transect was more various than that on Picea-Abies forest transect. It indicated that the coniferous broad-leaved mixed forest community had greater spatial heterogeneity in aspect of species composition than that with the Picea-Abies forest community.

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