Nitrogen acquisition strategies during the winter-spring transitional period are divergent at the species level yet convergent at the ecosystem level in temperate grasslands

doi:10.1016/j.soilbio.2018.04.020

	Nitrogen acquisition strategies during the winter-spring transitional period are divergent at the species level yet convergent at the ecosystem level in temperate grasslands
	Ma, Linna ; Liu, Guofang ; Xu, Xiaofeng 2; Xin, Xiaoping 3; Bai, Wenming; Zhang, Lihua ; Chen, Shiping; Wang, Renzhong1
	2018
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	122 页码:150-159
摘要	Nitrogen (N) is a major limiting element for productivity in temperate grasslands, particularly during early spring when soil N availability is low and the vegetative demand for it is high. Therefore, knowing whether and how plant species adopt different N acquisition strategies during the winter-spring transitional period is essential for understanding ecosystem functioning in temperate grasslands. In this study, parallel experiments with N-15 tracer were conducted to examine plant N acquisition strategies during winter-spring transition in a meadow and a typical steppe in northern China. We found that soil microbes immobilized 20% of the N-15 tracer during the spring thawing period at both sites, and then released half of it back to the soil before late spring, confirming that soil microbes competed effectively with the plant roots for mineral N in early spring. Perennial bunch grasses adopted an active N acquisition strategy at the beginning of the spring thawing period. In contrast, perennial forbs and rhizome grasses began to take up N in the middle of the spring thawing period, and they acquired more N than the bunch grasses. However, sagebrushes and legumes accounted for little N-15 recovery, indicating their dependence on internal N accumulation or N fixation. At the ecosystem level, no significant difference in the magnitude of plant N-15 uptake was observed between the meadow steppe and typical steppe, although the plant biomass N in the meadow steppe was twice that of the typical steppe during the thawing period. This was attributed to the higher soil inorganic N and faster net N mineralization rate in the meadow steppe than in the typical steppe. Our results suggest that temporal niche differentiation in N acquisition during early spring may facilitate species coexistence in temperate grasslands despite strong plant-microbe or plant-plant competition for N. The divergent N acquisition strategies at the species level and convergent N acquisition strategies at the ecosystem level should be considered for model development to better simulate vegetation growth particularly under spring N stress.
关键词	Early spring Microbial biomass N-15 labeling Plant-soil feedback Plant N uptake Temperate grassland
学科领域	Soil Science
DOI	10.1016/j.soilbio.2018.04.020
收录类别	SCI
语种	英语
WOS关键词	SOIL MICROBIAL BIOMASS ; INORGANIC NITROGEN ; ARCTIC TUNDRA ; POPULATION-DYNAMICS ; COMMUNITY STRUCTURE ; SEASONAL DYNAMICS ; ALPINE ECOSYSTEM ; LEYMUS-CHINENSIS ; NORTHERN CHINA ; CARBON
WOS记录号	WOS:000435053800016
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
资助机构	National Key Research and Development Program of China [2016YFC0500501] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31770527] ; Chinese Academy of Agriculture Sciences and Hulunber Grassland Ecosystem Observation and Research Station ; San Diego State University ; U.S. National Science FoundationNational Science Foundation (NSF) [1702797]
作者邮箱	xxu@mail.sdsu.edu ; wangrz@ibcas.ac.cn
引用统计	被引频次：17[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/2S10CLM1/20666
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 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.San Diego State Univ, Biol Dept, San Diego, CA 92182 USA 4.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Ma, Linna,Liu, Guofang,Xu, Xiaofeng,et al. Nitrogen acquisition strategies during the winter-spring transitional period are divergent at the species level yet convergent at the ecosystem level in temperate grasslands[J]. SOIL BIOLOGY & BIOCHEMISTRY,2018,122:150-159.
APA	Ma, Linna.,Liu, Guofang.,Xu, Xiaofeng.,Xin, Xiaoping.,Bai, Wenming.,...&Wang, Renzhong.(2018).Nitrogen acquisition strategies during the winter-spring transitional period are divergent at the species level yet convergent at the ecosystem level in temperate grasslands.SOIL BIOLOGY & BIOCHEMISTRY,122,150-159.
MLA	Ma, Linna,et al."Nitrogen acquisition strategies during the winter-spring transitional period are divergent at the species level yet convergent at the ecosystem level in temperate grasslands".SOIL BIOLOGY & BIOCHEMISTRY 122(2018):150-159.

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