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Retention of early-spring nitrogen in temperate grasslands: The dynamics of ammonium and nitrate nitrogen differ
Ma, Linna; Zhang, Chaoxue1; Feng, Jinchao2; Liu, Guofang; Xu, Xiaofeng3; Lue, Yixia1; He, Weiming1; Wang, Renzhong1
AbstractIn nitrogen (N)-limited temperate regions, winter is an important period of N accumulation. The accumulated N is released during snowmelt and thawing, and the availability peaks in early spring. However, the early-spring dynamics of specific N forms (i.e., ammonium NH4+ and nitrate NO3-) in temperate grasslands are still not fully understood. Here, we added (NH4+)-N-15 and (NO3-)-N-15 (equivalent to 150 mg (15)Nm(-2)) to the soils of a meadow steppe and a typical steppe in northern China immediately after snowmelt, then quantified the retention dynamics of (NH4+)-N-15 and (NO3-)-N-15 in soils, microbes, and plants over the subsequent growing season. Approximately 70% of the added N-15 tracers were initially retained within the soil-microbe-plant systems in both temperate grasslands. In early spring, much N-15 was immobilized in soils and microbes, while little had been taken up by plants. During the subsequent growing season, approximately 45% of the N-15 was rapidly lost by the soils and microbes, but plant N-15 acquisition gradually increased. Although soils and plants retained similar levels of (NH4+)-N-15 and (NO3-)-N-15 during the growing season, soil microbes retained more (NH4+)-N-15 than (NO3-)-N-15. Different plant taxa had distinct N-15 acquisition capacities: perennial grasses and forbs accumulated the N-15 tracers rapidly, while annuals did not. Perennial grasses were effective immobilizers of the (NH4+)-N-15, whereas forbs were effective immobilizers of the (NO3-)-N-15. These findings provided evidence of the substantial retention of early-spring N over the following growing season in temperate grasslands, regardless of the vegetation type and N form. However, it was clear that the dynamics of early-spring (NH4+)-N-15 and (NO3-)-N-15 differed within the soil-microbe-plant systems. (C) 2020 The Authors. Published by Elsevier B.V.
KeywordEarly spring Microbial N N-15 labeling N retention Plant N uptake Temperate grassland
Subject AreaBiodiversity Conservation ; Ecology
Indexed BySCI
WOS Research AreaBiodiversity & Conservation ; Environmental Sciences & Ecology
WOS IDWOS:000608479300024
Publication PlaceAMSTERDAM
Funding OrganizationNational Key Research and Development Program of China [2016YFC0500501] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [32071602] ; Chinese Academy of Agriculture Sciences
Corresponding Author Emailweiminghe@ibcas.ac.cn ; wangrz@ibcas.ac.cn
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Document Type期刊论文
Affiliation1.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.Chinese Acad Forestry, Inst Desertificat Studies, Beijing 100091, Peoples R China
4.San Diego State Univ, Dept Biol, San Diego, CA 92182 USA
Recommended Citation
GB/T 7714
Ma, Linna,Zhang, Chaoxue,Feng, Jinchao,et al. Retention of early-spring nitrogen in temperate grasslands: The dynamics of ammonium and nitrate nitrogen differ[J]. GLOBAL ECOLOGY AND CONSERVATION,2020,24.
APA Ma, Linna.,Zhang, Chaoxue.,Feng, Jinchao.,Liu, Guofang.,Xu, Xiaofeng.,...&Wang, Renzhong.(2020).Retention of early-spring nitrogen in temperate grasslands: The dynamics of ammonium and nitrate nitrogen differ.GLOBAL ECOLOGY AND CONSERVATION,24.
MLA Ma, Linna,et al."Retention of early-spring nitrogen in temperate grasslands: The dynamics of ammonium and nitrate nitrogen differ".GLOBAL ECOLOGY AND CONSERVATION 24(2020).
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