干旱区生态环境知识资源中心(Arid): Effects of grazing and precipitation variability on vegetation dynamics in a Mongolian dry steppe

Arid

	Effects of grazing and precipitation variability on vegetation dynamics in a Mongolian dry steppe
	Bat-Oyun Tserenpurev; Shinoda Masato; Cheng Yunxiang; Purevdorj Yadamjav
来源期刊	Journal of Plant Ecology
ISSN	1752-9921
出版年	2016
卷号	9 期号:5 页码:508-519
英文摘要	Aims Grazing and water availability are the primary drivers of vegetation dynamics in grazing-dominated regions of Mongolia with a semi-arid climate and frequent droughts. Nomadic animal husbandry still plays a large part in the economy of Mongolia, but more variable precipitation regime and increase in livestock number have severely affected grassland ecosystems through overgrazing, leading to pasture degradation. This study aimed to examine the effects of grazing exclusion, interannual variation of plant-available precipitation (PAP) and their interaction on the aboveground biomass (AGB) of each dominant species, the AGB of annual species and the total AGB in a Mongolian dry steppe, using long-term field data. Methods To detect the effect of grazing on vegetation dynamics, vegetation surveys were conducted in a non-grazed exclosure zone and a fully grazed area outside the exclosure. We assessed the effects of grazing, PAP and their interaction on AGB parameters using a generalized linear model. A detrended correspondence analysis (DCA) was used to visualize the effects of grazing and PAP on the AGB of each species. Important Findings Grazing, PAP and their interaction had significant effects on AGB. The effect of grazing on AGB was larger with higher precipitation and higher amounts of AGB (i.e. forage) while AGB was strongly limited in drought years, which resulted in a smaller grazing effect. The current year PAP had the highest impact (r = 0.88, P < 0.01) on AGB. The dominance of annual species was characterized by the amount of PAP in the current and preceding years: annuals dominated in wet years that followed consecutive dry years. The DCA Axis 1 reflected the variation of AGB with interannual variation of PAP while the DCA Axis 2 differentiated the grazing effect. The DCA scatter diagram based on species score illustrated that Artemisia adamsii (an unpalatable herb) was clearly linked to grazing disturbance whereas palatable perennials such as Agropyron cristatum, Stipa krylovii and Cleistogenes squarrosa were related to grazing abandonment and wetter conditions. In brief, number of livestock, hence the grazing impacts on vegetation dynamic in this region could have driven by forage availability, which is mainly controlled by current-year PAP.
英文关键词	aboveground biomass annual species drought grazing plant-available precipitation
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5848615
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335731
作者单位	Bat-Oyun Tserenpurev, Arid Land Research Center, Tottori University, Hamasaka, 680-0001, Japan.; Shinoda Masato, Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan.; Cheng Yunxiang, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu 730020, China.; Purevdorj Yadamjav, Department of Food Science and Human Wellness, Rakuno Gakuen University, Ebetsu, 069-8501, Japan.
推荐引用方式 GB/T 7714	Bat-Oyun Tserenpurev,Shinoda Masato,Cheng Yunxiang,et al. Effects of grazing and precipitation variability on vegetation dynamics in a Mongolian dry steppe[J],2016,9(5):508-519.
APA	Bat-Oyun Tserenpurev,Shinoda Masato,Cheng Yunxiang,&Purevdorj Yadamjav.(2016).Effects of grazing and precipitation variability on vegetation dynamics in a Mongolian dry steppe.Journal of Plant Ecology,9(5),508-519.
MLA	Bat-Oyun Tserenpurev,et al."Effects of grazing and precipitation variability on vegetation dynamics in a Mongolian dry steppe".Journal of Plant Ecology 9.5(2016):508-519.