干旱区生态环境知识资源中心(Arid): 高寒草地沙化过程植物群落构成及生态位特征变化

Arid

	高寒草地沙化过程植物群落构成及生态位特征变化
其他题名	Changes of Plant Community Composition and Niche Characteristics during Desertification Process in An Alpine Steppe
	宗宁; 石培礼; 朱军涛
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2021
卷号	30 期号:8 页码:1561-1570
中文摘要	草地沙化是目前面临的重要环境问题,会对草原地区牧草生产与居民生活环境产生影响。目前对沙化草地的研究主要集中在植被与土壤性质的变化,对物种之间关系的变化并未进行深入探究。基于经典的生态位理论,利用空间代替时间序列的方法,通过调查高寒草地沿沙化梯度的植物群落变化特征,分析沙化演替过程中高寒草原植物群落构成、生态位宽度以及生态位重叠(O)的变化,探索沙化过程植物种群的资源利用状况及生态适应能力,以期为青藏高原高寒草原植物多样性维持机制与沙化草地植被恢复提供参考依据。结果发现,随着沙化程度的加重,群落盖度和地上生物量呈现逐渐降低的趋势。不同的是,物种丰富度、辛普森指数和香农-维纳指数的最大值出现在轻度沙化梯度,而后呈显著降低趋势(P<0.001),但Pielou指数在各沙化梯度间差异不显著(P=0.634)。通过计算重要值发现,沙化梯度之间群落结构变异较大。相关性分析发现,沙化过程物种生态位宽度与重要值呈饱和曲线关系。随着沙化程度的加重,生态位高度重叠(>0.9)和部分重叠(0.5
英文摘要	Grassland desertification has become an urgent environmental issue, which negatively affects forage production and environmental conditions for residents living in grassland areas. Current researches on desertified grassland have been mainly focused on changes in vegetation and soil properties, while the changed relationships among species caused by desertification have been rarely investigated. Based on the classic niche theory, this study used space as a surrogate of time series to assess the changed characteristics of plant communities along the desertification gradient in alpine grasslands. The species composition, niche width, and niche overlap (O) were analyzed along the desertification gradients, as well as the resource utilization and ecological adaptability of plant populations. The research findings can provide scientific guidelines for revealing the mechanism maintaining plant diversity in alpine grasslands and for restoring desertified grassland vegetation of the Qinghai-Tibet Plateau. Along the desertification gradient, community coverage and aboveground biomass showed gradually decreasing trends. However, the highest species richness, Simpson index, and Shannon- Wiener index appeared in the light desertification gradient end, and then showed significant decreasing trends. The Pielou index did not differ significantly among the desertification gradients. The importance value showed that significant differences occurred in community structure among the desertification gradients. Correlation analysis found that species niche width along the desertification gradient displayed a saturation curve with the importance values. Along the increasing desertification, the number of plant population with high niche overlap (>0.9) and partial overlap (0.5
中文关键词	高寒草地 ; 沙化梯度 ; 多样性 ; 重要值 ; 生态位重叠
英文关键词	alpine grassland desertification gradient biodiversity importance value niche overlap
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Plant Sciences
CSCD记录号	CSCD:7089249
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377829
作者单位	宗宁, 中国科学院地理科学与资源研究所, 中国科学院生态系统网络观测与模拟重点实验室;;中国科学院拉萨高原生态试验站, 北京 100101, 中国.; 朱军涛, 中国科学院地理科学与资源研究所, 中国科学院生态系统网络观测与模拟重点实验室;;中国科学院拉萨高原生态试验站, 北京 100101, 中国.; 石培礼, 中国科学院地理科学与资源研究所;;中国科学院大学资源与环境学院, 中国科学院生态系统网络观测与模拟重点实验室;;中国科学院拉萨高原生态试验站;;, ;;, 北京;;北京 100101;;100049, 中国.
推荐引用方式 GB/T 7714	宗宁,石培礼,朱军涛. 高寒草地沙化过程植物群落构成及生态位特征变化[J],2021,30(8):1561-1570.
APA	宗宁,石培礼,&朱军涛.(2021).高寒草地沙化过程植物群落构成及生态位特征变化.生态环境学报,30(8),1561-1570.
MLA	宗宁,et al."高寒草地沙化过程植物群落构成及生态位特征变化".生态环境学报 30.8(2021):1561-1570.