Direct and indirect effects of nitrogen enrichment and grazing on grassland productivity through intraspecific trait variability

doi:10.1111/1365-2664.14078

	Direct and indirect effects of nitrogen enrichment and grazing on grassland productivity through intraspecific trait variability
	Zheng, Shuxia ; Chi, Yonggang 1; Yang, Xiaojing 2; Li, Wenhuai 3; Lan, Zhichun 4; Bai, Yongfei
	2022
发表期刊	JOURNAL OF APPLIED ECOLOGY
ISSN	0021-8901
卷号	59 期号:2 页码:598-610
摘要	In the context of global change, the effects of livestock grazing and nitrogen (N) deposition on ecosystem structure and function of grasslands are not isolated, but simultaneous or even interactive. However, most studies on variations in plant functional traits and linkages to ecosystem function have focused on grazing or N enrichment alone. Few studies have combined these two factors to explore the role of intraspecific trait variability in community assembly and primary productivity, and their pathways on ANPP remain unclear. Here, we examined the effects of N addition and grazing on intra- and interspecific variations in plant functional traits in Inner Mongolia steppe based on two manipulative experiments with six N addition rates or grazing intensities over 6 years. The direct and indirect effects of N addition and grazing on ANPP were further analysed. Our results showed that N enrichment greatly enhanced intraspecific trait variability compared to grazing, which played an important role in maintaining species diversity and primary productivity. There was a negative linear relationship between species richness and intraspecific trait variance within community (T-IP/IC), indicating that N enrichment promoted intraspecific trait variability and increased interspecific niche width, leading to a decrease in species richness. ANPP was positively correlated with T-IP/IC values under N addition or grazing, suggesting that higher intraspecific trait variability was beneficial to maintaining grassland productivity. We also found that N addition had a direct positive effect on ANPP, and intraspecific trait variation was the secondary cause of ANPP variation; in contrast, grazing had an indirect negative effect on ANPP, mainly through species richness and interspecific trait variation. Synthesis and applications. Our findings have important implications for the restoration and management of semi-arid grasslands. Considering the offsetting effects of N addition and grazing on primary productivity, fertilization measures can be integrated into pasture management to quickly restore productivity. In the restoration of degraded grassland by artificial reseeding, the optimal seedling density related to intraspecific variation should be determined, and the forge species should be selected according to plant functional traits, taking into account the strategies of both conservative resource-use and grazing tolerance.
关键词	above-ground net primary productivity functional diversity grazing intensity internal and external filters intraspecific trait variability nitrogen addition species richness typical steppe
学科领域	Biodiversity Conservation ; Ecology
DOI	10.1111/1365-2664.14078
收录类别	SCI
语种	英语
WOS关键词	PLANT FUNCTIONAL TRAITS ; INNER-MONGOLIA ; ECOSYSTEM STABILITY ; BIODIVERSITY LOSS ; DIVERSITY ; RESPONSES ; THRESHOLDS ; MECHANISMS ; STEPPE ; MINERALIZATION
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000719877200001
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1365-2664
资助机构	State Key Research and Development Program of China [2017YFA0604702] ; National Natural Science Foundation of China [41671046, 32071883] ; Science and Technology Transformation Project of Inner Mongolia Autonomous Region [2020CG0055]
作者邮箱	zsx@ibcas.ac.cn ; yfbai@ibcas.ac.cn
引用统计	被引频次：15[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/28638
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 2.Zhejiang Normal Univ, Coll Geog & Environm Sci, Jinhua, Zhejiang, Peoples R China 3.Shaanxi Normal Univ, Sch Geog & Tourism, Xian, Peoples R China 4.Inner Mongolia Univ, Sch Ecol & Environm, Hohhot, Peoples R China 5.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Observat & Res Stn Wetland Ecosyst Lake Poyang, Lushan, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Shuxia,Chi, Yonggang,Yang, Xiaojing,et al. Direct and indirect effects of nitrogen enrichment and grazing on grassland productivity through intraspecific trait variability[J]. JOURNAL OF APPLIED ECOLOGY,2022,59(2):598-610.
APA	Zheng, Shuxia,Chi, Yonggang,Yang, Xiaojing,Li, Wenhuai,Lan, Zhichun,&Bai, Yongfei.(2022).Direct and indirect effects of nitrogen enrichment and grazing on grassland productivity through intraspecific trait variability.JOURNAL OF APPLIED ECOLOGY,59(2),598-610.
MLA	Zheng, Shuxia,et al."Direct and indirect effects of nitrogen enrichment and grazing on grassland productivity through intraspecific trait variability".JOURNAL OF APPLIED ECOLOGY 59.2(2022):598-610.

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