干旱区生态环境知识资源中心(Arid): Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation

Arid

DOI	10.1002/ece3.6038
	Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation
	Zong, Ning 1; Song, Minghua 1; Zhao, Guangshuai 2; Shi, Peili 1,3
通讯作者	Zong, Ning ; Shi, Peili
来源期刊	ECOLOGY AND EVOLUTION
ISSN	2045-7758
出版年	2020
卷号	10 期号:4 页码:2051-2061
英文摘要	Nitrogen (N) is one of the most important factors limiting plant productivity, and N fixation by legume species is an important source of N input into ecosystems. Meanwhile, N resorption from senescent plant tissues conserves nutrients taken up in the current season, which may alleviate ecosystem N limitation. N fixation was assessed by the N-15 dilution technique in four types of alpine grasslands along the precipitation and soil nutrient gradients. The N resorption efficiency (NRE) was also measured in these alpine grasslands. The aboveground biomass in the alpine meadow was 4-6 times higher than in the alpine meadow steppe, alpine steppe, and alpine desert steppe. However, the proportion of legume species to community biomass in the alpine steppe and the alpine desert steppe was significantly higher than the proportion in the alpine meadow. N fixation by the legume plants in the alpine meadow was 0.236 g N/m(2), which was significantly higher than N fixation in other alpine grasslands (0.041 to 0.089 g N/m(2)). The NRE in the alpine meadows was lower than in the other three alpine grasslands. Both the aboveground biomass and N fixation of the legume plants showed decreasing trends with the decline of precipitation and soil N gradients from east to west, while the NRE of alpine plants showed increasing trends along the gradients, which indicates that alpine plants enhance the NRE to adapt to the increasing droughts and nutrient-poor environments. The opposite trends of N fixation and NRE along the precipitation and soil nutrient gradients indicate that alpine plants adapt to precipitation and soil nutrient limitation by promoting NRE (conservative nutrient use by alpine plants) rather than biological N fixation (open sources by legume plants) on the north Tibetan Plateau.
英文关键词	Alpine grassland biological nitrogen fixation legume species nitrogen resorption efficiency precipitation gradient
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000509469900001
WOS关键词	NUTRIENT RESORPTION ; PRECIPITATION GRADIENT ; PHOSPHORUS RESORPTION ; SEMIARID GRASSLAND ; CARBON ; WATER ; RESPONSES ; PATTERNS ; TRAITS ; EFFICIENCIES
WOS类目	Ecology ; Evolutionary Biology
WOS研究方向	Environmental Sciences & Ecology ; Evolutionary Biology
EI主题词	2020-01-27
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312610
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing, Peoples R China; 2.Natl Forestry & Grassland Adm, China Natl Forestry Grassland Econ & Dev Res Ctr, Beijing, Peoples R China; 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zong, Ning,Song, Minghua,Zhao, Guangshuai,et al. Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation[J]. 中国科学院地理科学与资源研究所,2020,10(4):2051-2061.
APA	Zong, Ning,Song, Minghua,Zhao, Guangshuai,&Shi, Peili.(2020).Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation.ECOLOGY AND EVOLUTION,10(4),2051-2061.
MLA	Zong, Ning,et al."Nitrogen economy of alpine plants on the north Tibetan Plateau: Nitrogen conservation by resorption rather than open sources through biological symbiotic fixation".ECOLOGY AND EVOLUTION 10.4(2020):2051-2061.