干旱区生态环境知识资源中心(Arid): Sexual Reproduction Is Not Responsible for Caragana Shrub Encroachment in Grasslands

Arid

DOI	10.3390/agronomy13071848
	Sexual Reproduction Is Not Responsible for Caragana Shrub Encroachment in Grasslands
	Xie, Lina; Li, Yuchen; Lin, Mingyan; Guo, Hongyu; Wang, Yue; Wang, Lihong; Ma, Chengcang
通讯作者	Ma, CC
来源期刊	AGRONOMY-BASEL
EISSN	2073-4395
出版年	2023
卷号	13 期号:7
英文摘要	Shrubs tended to increase their abundance as climatic aridity and grazing intensity increased in the Inner Mongolian grassland. Increasing shrub abundance was believed to be due to enhanced reproduction. However, the effects of climatic aridity and grazing on the sexual reproduction of shrubs in grassland remain largely unclear. In this study, we conducted field experiments with Caragana microphylla to examine the variation of sexual reproduction aspects (seed production, seed vigor, and sapling establishment) along a climatic aridity gradient (subhumid, semiarid, arid, and dry arid zones) and a grazing intensity gradient (fenced, mildly grazed, and severely grazed). We then quantified the population growth rate based on seed production and sapling establishment rates. Our objective was to evaluate whether sexual reproduction is the main mechanism for Caragana encroachment into grasslands. We found that climatic aridity decreased seed quantity and seed vigor but increased the sapling establishment rate of Caragana shrubs. Under ungrazed conditions, climatic aridity did not affect population growth rates, while under grazing conditions, increased aridity stresses reduced population growth rates. Grazing reduced seed production, sapling establishment, and population growth rates. Climatic aridity enhanced the negative effects of grazing on sexual reproduction, while grazing intensified the negative effects of aridity on the population growth of Caragana shrubs. In conclusion, climatic aridity, grazing, and their combined effects had negative effects on the sexual reproduction of Caragana shrubs. Therefore, sexual reproduction could not fully explain the increased abundance of shrubs with increasing aridity and grazing. Clonal reproduction might be of considerable importance for understanding the mechanism of shrub encroachment in grasslands.
英文关键词	shrub encroachment population growth sexual reproduction grazing climatic aridity gradient
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001034705000001
WOS关键词	LEYMUS-CHINENSIS POACEAE ; SEED PRODUCTION ; WOODY ENCROACHMENT ; GRAZING INTENSITY ; CLIMATE GRADIENT ; PINUS-SYLVESTRIS ; LIFE-HISTORY ; POPULATIONS ; ESTABLISHMENT ; HERBIVORY
WOS类目	Agronomy ; Plant Sciences
WOS研究方向	Agriculture ; Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395217
推荐引用方式 GB/T 7714	Xie, Lina,Li, Yuchen,Lin, Mingyan,et al. Sexual Reproduction Is Not Responsible for Caragana Shrub Encroachment in Grasslands[J],2023,13(7).
APA	Xie, Lina.,Li, Yuchen.,Lin, Mingyan.,Guo, Hongyu.,Wang, Yue.,...&Ma, Chengcang.(2023).Sexual Reproduction Is Not Responsible for Caragana Shrub Encroachment in Grasslands.AGRONOMY-BASEL,13(7).
MLA	Xie, Lina,et al."Sexual Reproduction Is Not Responsible for Caragana Shrub Encroachment in Grasslands".AGRONOMY-BASEL 13.7(2023).