干旱区生态环境知识资源中心(Arid): Nitrogen-enhanced herbaceous competition threatens woody species persistence in a desert ecosystem

Arid

DOI	10.1007/s11104-020-04810-y
	Nitrogen-enhanced herbaceous competition threatens woody species persistence in a desert ecosystem
	She, Weiwei; Bai, Yuxuan; Zhang, Yuqing; Qin, Shugao; Feng, Wei; Lai, Zongrui; Qiao, Yangui; Liu, Liang; Zhang, Wenjin; Miao, Chun
通讯作者	Zhang, YQ (corresponding author), Beijing Forestry Univ, Key Lab State Forestry Adm Soil & Water Conservat, Beijing 100083, Peoples R China.
来源期刊	PLANT AND SOIL
ISSN	0032-079X
EISSN	1573-5036
出版年	2021
卷号	460 期号:1-2 页码:333-345
英文摘要	Aims Water and nitrogen availability are primary determinants of woody communities in dryland ecosystems and are strongly affected by global change. However, the mechanisms by which resource availability and plant demographic responses regulate woody-herb composition are unclear. Methods We investigated plant productivity, shrub demography, and resource availability in a 5-year field experiment involving three levels of precipitation (ambient, + 20% precipitation, + 40% precipitation) and two levels of nitrogen addition (0, 60 kg N ha(- 1) yr(- 1)) in a desert shrubland of northern China. Results Increased precipitation had similar positive effects on shrub and herbaceous productivity and, thus, did not alter the community composition. However, nitrogen enrichment dramatically increased herbaceous productivity but tended to decrease shrub productivity. Five years after the experimental manipulation, increased precipitation and nitrogen enrichment significantly altered shrub demography. Increased precipitation decreased the number and cover of small shrubs but increased those of large shrubs. Nitrogen enrichment largely decreased the number and cover of small shrubs, whereas large shrubs showed a higher resistance. Structural equation modeling revealed that nitrogen-enhanced herbaceous competition for water and light potentially reduced shrub growth, especially the growth of small shrubs. Conclusions Our results suggest that large shrubs can coexist with herbs, whereas small shrubs tend to be competitively excluded from the system under enhanced precipitation and nitrogen deposition. Nitrogen enrichment may lead to continued declines in shrub recruitment and growth, and a conversion to grassland. Our findings highlight the competitive and demographic mechanisms underlying the responses of woody communities to global change.
英文关键词	Competition Community composition Nitrogen deposition Plant demography Precipitation change Shrubland
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000607330400003
WOS关键词	TREE-GRASS INTERACTIONS ; SHRUB ENCROACHMENT ; 2-LAYER HYPOTHESIS ; PLANT DIVERSITY ; N-ENRICHMENT ; PRECIPITATION ; DEPOSITION ; WATER ; AVAILABILITY ; CONSEQUENCES
WOS类目	Agronomy ; Plant Sciences ; Soil Science
WOS研究方向	Agriculture ; Plant Sciences
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351329
作者单位	[She, Weiwei; Bai, Yuxuan; Zhang, Yuqing; Qin, Shugao; Feng, Wei; Lai, Zongrui; Qiao, Yangui; Liu, Liang; Zhang, Wenjin; Miao, Chun] Beijing Forestry Univ, Sch Soil & Water Conservat, Yanchi Res Stn, Beijing 100083, Peoples R China; [She, Weiwei; Zhang, Yuqing; Feng, Wei; Lai, Zongrui] Beijing Forestry Univ, Key Lab State Forestry Adm Soil & Water Conservat, Beijing 100083, Peoples R China; [Qin, Shugao] Beijing Forestry Univ, Engn Res Ctr Forestry Ecol Engn, Minist Educ, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	She, Weiwei,Bai, Yuxuan,Zhang, Yuqing,et al. Nitrogen-enhanced herbaceous competition threatens woody species persistence in a desert ecosystem[J]. 北京林业大学,2021,460(1-2):333-345.
APA	She, Weiwei.,Bai, Yuxuan.,Zhang, Yuqing.,Qin, Shugao.,Feng, Wei.,...&Miao, Chun.(2021).Nitrogen-enhanced herbaceous competition threatens woody species persistence in a desert ecosystem.PLANT AND SOIL,460(1-2),333-345.
MLA	She, Weiwei,et al."Nitrogen-enhanced herbaceous competition threatens woody species persistence in a desert ecosystem".PLANT AND SOIL 460.1-2(2021):333-345.