干旱区生态环境知识资源中心(Arid): 小叶锦鸡儿灌丛化对典型草原群落结构与生态系统功能的影响

Arid

	小叶锦鸡儿灌丛化对典型草原群落结构与生态系统功能的影响
其他题名	Effects of Caragana microphylla encroachment on community structure and ecosystem function of a typical steppe
	丁威; 王玉冰; 向官海; 迟永刚; 鲁顺保; 郑淑霞
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2020
卷号	44 期号:1 页码:33-43
中文摘要	草原灌丛化是全球干旱半干旱地区面临的重要生态问题。灌丛化对草原生态系统结构与功能的影响较为复杂,有待于在更广泛的区域开展研究。该研究在内蒙古锡林郭勒典型草原选择轻度、中度和重度灌丛化草地,通过群落调查,结合植物功能性状和土壤理化性质观测,研究了小叶锦鸡儿(Caragana microphylla)灌丛化对草原群落结构(物种多样性、功能多样性和功能群组成)和生态系统功能(初级生产力、植被和土壤养分库)的影响。结果表明: 1)不同程度灌丛化草地的物种丰富度、功能性状多样性和群落加权性状平均值差异显著,其中,中度灌丛化草地的物种多样性和功能多样性较高,表明一定程度的灌丛化有利于生物多样性维持。2)重度灌丛化草地的地上净初级生产力(ANPP)显著高于轻度和中度灌丛化草地,其原因主要是随着灌丛化程度加剧,群落内一/二年生草本植物显著增加,而多年生禾草和多年生杂类草显著减少。三个灌丛化草地的植被叶片和土壤碳、氮库差异均不显著。3)灌丛化对草原生态系统功能包括ANPP、植被和土壤养分库均没有直接的影响,而是通过影响功能群组成、土壤理化性质和功能多样性,间接地影响生态系统功能;灌丛化导致功能群发生替代和土壤旱碱化是最重要的生物和非生物因素。
英文摘要	Aims Shrub encroachment is a critical ecological problem in arid and semi-arid ecosystems worldwide. The effects of shrub encroachment on ecosystem structure and function of grasslands are complicated and need to be explored in future studies. Our objective is to examine the effects and pathways of shrub encroachment on ecosystem structure and function in a typical steppe of the Inner Mongolia grassland. Methods Three grassland sites with different degrees of shrub encroachment (i.e. light, moderate, heavy) were selected in the Xilingol Nei Mongol, of which Caragana microphylla was the dominant shrub. Species richness and composition, aboveground net primary productivity (ANPP), soil property, and plant functional traits of dominant species were determined in this study. In addition, species diversity, functional attribute diversity, community-weighted mean traits, and vegetation leaf and soil carbon and nitrogen pools were further calculated. Important findings 1) The species richness, functional attribute diversity and community-weighted mean traits differed significantly among three grassland sites, and species diversity and functional diversity were relatively higher in the moderate shrub-encroachment site, indicating moderate shrub-encroachment favors biodiversity maintenance. 2) The aboveground net primary productivity of heavy shrub-encroachment grassland was significantly higher than those of light and moderate shrub-encroachment grasslands, which was mainly due to a shift in functional group composition, that is, the proportion of annuals and biennials to perennial grasses and forbs increased greatly with intensifying shrub encroachment. The vegetation leaf and soil carbon and nitrogen pools differed little among three sites. 3) Shrub encroachment did not directly affect ecosystem function, including ANPP, vegetation and soil nutrient pools, but it indirectly affected them through pathways of the shift in functional group composition and changes in soil property and functional diversity. Particularly, the shift in functional group composition and intensified soil drought and basification was separately important biotic and abiotic factors for variations in ecosystem function.
中文关键词	灌丛化 ; 物种多样性 ; 功能多样性 ; 植物功能性状 ; 功能群组成 ; 生态系统功能
英文关键词	shrub encroachment species diversity functional diversity plant functional trait functional group composition ecosystem function
类型	Article
语种	中文
开放获取类型	gold
收录类别	CSCD
WOS类目	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:6728780
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/379023
作者单位	丁威, 江西师范大学生命科学学院, 南昌, 江西 330022, 中国.; 鲁顺保, 江西师范大学生命科学学院, 南昌, 江西 330022, 中国.; 王玉冰, 中国科学院植物研究所;;中国科学院大学, 植被与环境变化国家重点实验室;;, ;;, 北京;;北京 100093;;100049, 中国.; 向官海, 中国科学院植物研究所;;中国科学院大学, 植被与环境变化国家重点实验室;;, ;;, 北京;;北京 100093;;100049, 中国.; 迟永刚, 浙江师范大学地理与环境科学学院, 金华, 浙江 321004, 中国.; 郑淑霞, 中国科学院植物研究所, 植被与环境变化国家重点实验室, 北京 100093, 中国.
推荐引用方式 GB/T 7714	丁威,王玉冰,向官海,等. 小叶锦鸡儿灌丛化对典型草原群落结构与生态系统功能的影响[J],2020,44(1):33-43.
APA	丁威,王玉冰,向官海,迟永刚,鲁顺保,&郑淑霞.(2020).小叶锦鸡儿灌丛化对典型草原群落结构与生态系统功能的影响.植物生态学报,44(1),33-43.
MLA	丁威,et al."小叶锦鸡儿灌丛化对典型草原群落结构与生态系统功能的影响".植物生态学报 44.1(2020):33-43.