干旱区生态环境知识资源中心(Arid): Can the intermediate disturbance hypothesis explain grazing-diversity relations at a global scale?

Arid

DOI	10.1111/oik.06338
	Can the intermediate disturbance hypothesis explain grazing-diversity relations at a global scale?
	Gao, Junjing; Carmel, Yohay
通讯作者	Gao, Junjing
来源期刊	OIKOS
ISSN	0030-1299
EISSN	1600-0706
出版年	2020
卷号	129 期号:4 页码:493-502
英文摘要	In the context of grazing, the intermediate disturbance hypothesis (IDH) predicts that plant diversity peaks under moderate grazing, resulting in a hump-shape pattern for the grazing-diversity relationship. Although this has been debated due to contradictory empirical results, the IDH is still widely accepted among rangeland ecologists. The Milchunas-Sala-Lauenroth (MSL) model predicts that in arid areas grazing affects diversity negatively regardless of grazing intensity, whereas in mesic areas grazing effects on plant diversity are the same as predicted by the IDH. Very few studies have attempted to specifically evaluate the applicability of the IDH and MSL to grazing systems at a global scale, accounting for the possible effects of climate. We conducted a meta-analysis and vote-counting analysis to evaluate these two hypotheses. The results of both analyses show that the IDH cannot be applied globally and that its application largely depends on aridity. The IDH prediction of a hump-shape curve is supported in wet areas, while in dry areas there is a slight decrease in species richness with increasing grazing intensity. Overall, the MSL model correctly predicted grazing-diversity relations in both wet and dry areas. Looking at specific ecosystem types, we found that these results hold in grasslands, but not in woodlands. Differences between livestock types, not considered by the MSL model, were found to be important. Mixed sheep and goat grazing in dry areas resulted in a significant decline of species richness with grazing intensity, while grazing by sheep only had little effect on species richness. Cattle grazing and yak grazing in wet areas yielded a clear hump-shape pattern. Therefore, we conclude that the climate-specific MSL model better predicts the impact of grazing on diversity than the IDH in rangelands, and that the response patterns of plant richness to grazing are dependent on aridity, grazing intensity and grazer type.
英文关键词	aridity grazing intensity intermediate disturbance hypothesis meta-analysis plant diversity vote-counting
类型	Article
语种	英语
国家	Israel
收录类别	SCI-E
WOS记录号	WOS:000508939500001
WOS关键词	GRASSLAND PLANT DIVERSITY ; SPECIES RICHNESS ; VEGETATION ; PRODUCTIVITY ; HERBIVORES ; INTENSITY ; METAANALYSIS ; MECHANISMS ; RANGELANDS ; EXCLUSION
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2020-01-22
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312574
作者单位	Technion Israel Inst Technol, Fac Civil & Environm Engn, IL-3200003 Haifa, Israel
推荐引用方式 GB/T 7714	Gao, Junjing,Carmel, Yohay. Can the intermediate disturbance hypothesis explain grazing-diversity relations at a global scale?[J],2020,129(4):493-502.
APA	Gao, Junjing,&Carmel, Yohay.(2020).Can the intermediate disturbance hypothesis explain grazing-diversity relations at a global scale?.OIKOS,129(4),493-502.
MLA	Gao, Junjing,et al."Can the intermediate disturbance hypothesis explain grazing-diversity relations at a global scale?".OIKOS 129.4(2020):493-502.