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The retention dynamics of N input within the soil-microbe-plant system in a temperate grassland
Ma, Linna; Gao, Xiuli1; Liu, Guofang; Xu, Xiaofeng2; Lu, Xiaotao3; Xin, Xiaoping4; Lu, Yixia1; Zhang, Chaoxue1; Zhang, Lihua; Wang, Renzhong1
Source PublicationGEODERMA
AbstractIn N-limited temperate regions, atmospheric N deposition remains high over the non-growing season. However, the retention dynamics of non-growing season N input within the ecosystem remain unclear. Using an isotopic approach, we investigated the initial retention and subsequent dynamics of N-15 (1.5 g N-15 m(-2)) in the soils, microbes, plants, and litter over three years in grazing-prohibited (PG) and heavily grazed treatments (HG) in northern China. For initial retention (21 days after( 15)N addition), most N-15 was immobilized in soils and microbes, while less was taken up by plants. Soil and microbial N-15 immobilization were significantly higher when grazing was prohibited, although plant 15 Nacquisition was not affected by grazing. After initial retention, rapid N-15 loss was observed in microbes and soils, while N-15 levels were sustained longer in plants and litter. The N-15 residence times were longer when grazing was prohibited. The 15 Nacquisition capacity varies among plant taxa: perennial grasses and forbs accumulated N-15 rapidly, while sagebrush and legumes acted slowly. Although the added N-15 had significant contribution to early spring N demands of soil microbes and plants, it did not increase microbial or plant biomass N. Our results showed that non-growing season exogenous N was primarily retained by soil biota in temperate grasslands in the early stage, but N retention is finally sustained in soil and plants. The findings highlighted the importance of soil microbes in sustaining N upon N input, inferring the needs for considering the microbial role for better understanding N cycling in the temperate grasslands.
KeywordN deposition N-15 N Retention Non-growing season Temperate grassland
Subject AreaSoil Science
Indexed BySCI
WOS Research AreaAgriculture
WOS IDWOS:000524458400021
Publication PlaceAMSTERDAM
Funding OrganizationNational 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 ; Hulunber Grassland Ecosystem Observation and Research Station ; San Diego State University
Corresponding Author Emailxxu@sdsu.edu ; wangrz@ibcas.ac.cn
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
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.San Diego State Univ, Biol Dept, San Diego, CA 92182 USA
4.Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Erguna Forest Steppe Ecotone Res Stn, Shenyang 110016, Peoples R China
5.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Ma, Linna,Gao, Xiuli,Liu, Guofang,et al. The retention dynamics of N input within the soil-microbe-plant system in a temperate grassland[J]. GEODERMA,2020,368.
APA Ma, Linna.,Gao, Xiuli.,Liu, Guofang.,Xu, Xiaofeng.,Lu, Xiaotao.,...&Wang, Renzhong.(2020).The retention dynamics of N input within the soil-microbe-plant system in a temperate grassland.GEODERMA,368.
MLA Ma, Linna,et al."The retention dynamics of N input within the soil-microbe-plant system in a temperate grassland".GEODERMA 368(2020).
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