干旱区生态环境知识资源中心(Arid): 古尔班通古特沙漠白梭梭群落林下层物种多样性的空间分异

Arid

	古尔班通古特沙漠白梭梭群落林下层物种多样性的空间分异
其他题名	Spatial Variation of the Diversity Characteristics of Understory Plant Species of Haloxylon persicum in the Gurbantunggut Desert
	于丹丹; 唐立松; 李彦; 徐贵青
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2010
卷号	27 期号:4 页码:559-566
中文摘要	以野外样方调查数据为基础, 采用重要值计算了多样性指数、均匀度指数、丰富度指数、优势度指数, 对古尔班通古特沙漠南缘至腹地白梭梭群落林下植被的物种多样性进行了研究. 结果表明: 受降水梯度的影响, 从南缘至腹地植被盖度变化范围在14%~36%, 除南缘取样点(S_1)受人类扰动较大, 盖度有些波动外, 总体呈现明显的下降趋势. 但植株种群密度差异较小, 初步推断, 植被盖度的差异主要是由植株个体大小造成的, 而不是植株种群密度. 南缘至腹地, 各样地的多样性指数、均匀度指数、丰富度指数均表现为先减后增的变化趋势, 优势度指数变化趋势则与之相反. 各指数的变化范围: 物种数在5.9~11.4种/m~2, 多样性指数变化范围在1.034 0~2.097 1, 各样地均匀度指数在0.606 8~0.876 0, 优势度指数为0.276 7~0.664 3. 距沙漠南缘6.57 km处是物种多样性的一个重要转折点, 是物种多样性较不丰富的地带. 同时, 对白梭梭群落林下植被在1 m1 m, 20 m20 m, 100 m*100 m三种尺度下, 南缘到腹地植物物种数的变化分析得出, 在100 m~2尺度以下, 白梭梭群落林下植被的物种多样性随空间尺度的增大而增大.
英文摘要	The species diversity is an important trait of plant ecological adaptive strategy. The Haloxylon persicum community is widely distributed in the Guerbantongtute Desert and plays an important role in stabilizing plant composite. However, the species diversity of the understory of Haloxylon persicum is poorly known. Our objectives are to investigate the species diversity of the understory of Haloxylon persicum from the southern edge to the desert hinterland of the Guerbantongtute Desert and to discuss the relationship between the variation of the understory of Haloxylon persicum natural population and in different distribution areas. A field investigation was conducted on distributed areas of Haloxylon persicum from the southern edge to the desert hinterland of the Guerbantongtute Desert from April to June in 2009, We investigated quantitative measures of species of the understory of Haloxylon persicum from the southern edge to the desert hinterland of the Gurbantunggut desert, including the population coverage, the height, the density and the species number. Based on the field investigation from the plots of natural plant communities, the diversity index, evenness index, richness index and dominance index were used to analyze the species diversity of the understory of Haloxylon persicum from the southern edge to the desert hinterland of the Guerbantongtute Desert. The results indicated that the species diversity, evenness and richness tended to decrease gradually at first and then increase, while the dominance is in reverse direction complicated. In addition, the species number of the understory ranged from 5.9 to 11.4 per square meter. The Shannon-Weiner index was from 1.034 0 to 2.097 1 and the evenness index was 0.606 8-0.876 0 per square meter. The dominance index ranged from 0.276 7 to 0.664 3 per square meter. A distance of 6.57 km far away from the southern edge was an important turning point for species diversity. The vegetation coverage varied from 14% to 36% with an obvious declining trend from the southern edge to the desert hinterland which was resulted from a precipitation gradient. However, the population density was not significantly different under the precipitation gradient. Thus, we concluded that the differentia of plant coverage is the result of individual size but not the population density. From the southern edge to the desert hinterland, there was similar variation trend in species number with sampling plot sizes of the 1 m1 m and 20 m20 m, but the species number with plot size of the 100 m*100 m increased gradually from the edge to the center, with the decreasing of human activities. These results described that species diversity of desert community at small scale (1ess than 100 square meter) is strongly sampling scale dependent.
中文关键词	白梭梭 ; 群落 ; 多样性指数 ; 草本植物 ; 空间尺度 ; 古尔班通古特沙漠
英文关键词	Haloxylon persicum community species diversity indices herbaceous plant spatial scale Guerbantonggute Desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3919833
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225079
作者单位	中国科学院新疆生态与地理研究所阜康荒漠生态站, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	于丹丹,唐立松,李彦,等. 古尔班通古特沙漠白梭梭群落林下层物种多样性的空间分异[J]. 中国科学院新疆生态与地理研究所,2010,27(4):559-566.
APA	于丹丹,唐立松,李彦,&徐贵青.(2010).古尔班通古特沙漠白梭梭群落林下层物种多样性的空间分异.干旱区研究,27(4),559-566.
MLA	于丹丹,et al."古尔班通古特沙漠白梭梭群落林下层物种多样性的空间分异".干旱区研究 27.4(2010):559-566.