IB-CAS  > 植被与环境变化国家重点实验室
Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi-arid grassland
Chen, Dima; Xing, Wen; Lan, Zhichun1,2; Saleem, Muhammad3; Wu, Yunqiqige4; Hu, Shuijin5; Bai, Yongfei
2019
Source PublicationFUNCTIONAL ECOLOGY
ISSN0269-8463
Volume33Issue:1Pages:175-187
AbstractSemi-arid grasslands on the Mongolian Plateau are expected to experience high inputs of anthropogenic reactive nitrogen in this century. It remains unclear, however, how soil organisms and nutrient cycling are directly affected by N enrichment (i.e., without mediation by plant input to soil) vs. indirectly affected via changes in plant-related inputs to soils resulting from N enrichment. To test the direct and indirect effects of N enrichment on soil organisms (bacteria, fungi and nematodes) and their associated C and N mineralization, in 2010, we designated two subplots (with plants and without plants) in every plot of a six-level N-enrichment experiment established in 1999 in a semi-arid grassland. In 2014, 4 years after subplots with and without plant were established, N enrichment had substantially altered the soil bacterial, fungal and nematode community structures due to declines in biomass or abundance whether plants had been removed or not. N enrichment also reduced the diversity of these groups (except for fungi) and the soil C mineralization rate and induced a hump-shaped response of soil N mineralization. As expected, plant removal decreased the biomass or abundance of soil organisms and C and N mineralization rates due to declines in soil substrates or food resources. Analyses of plant-removal-induced changes (ratios of without- to with-plant subplots) showed that micro-organisms and C and N mineralization rates were not enhanced as N enrichment increased but that nematodes were enhanced as N enrichment increased, indicating that the effects of plant removal on soil organisms and mineralization depended on trophic level and nutrient status. Surprisingly, there was no statistical interaction between N enrichment and plant removal for most variables, indicating that plant-related inputs did not qualitatively change the effects of N enrichment on soil organisms or mineralization. Structural equation modelling confirmed that changes in soil communities and mineralization rates were more affected by the direct effects of N enrichment (via soil acidification and increased N availability) than by plant-related indirect effects. Our results provide insight into how future changes in N deposition and vegetation may modify below-ground communities and processes in grassland ecosystems.
Keywordbelow-ground carbon allocation below-ground communities mass ratio hypothesis plant-soil interactions soil acidification soil food web trophic groups
Subject AreaEcology
DOI10.1111/1365-2435.13226
Indexed BySCI
Language英语
WOS KeywordBELOW-GROUND COMMUNITIES ; PLANT DIVERSITY ; MICROBIAL COMMUNITIES ; BACTERIAL COMMUNITIES ; FUNGAL DIVERSITY ; ELEVATED CO2 ; FOOD WEBS ; FERTILIZATION ; DEPOSITION ; PRODUCTIVITY
WOS Research AreaEnvironmental Sciences & Ecology
WOS IDWOS:000456691600016
PublisherWILEY
SubtypeArticle
Publication PlaceHOBOKEN
EISSN1365-2435
Funding OrganizationYouth Innovation Promotion Association of the Chinese Academy of Sciences [2015061] ; Chinese National Key Development Program for Basic Research [2015CB954201] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31320103916, 31570450]
Corresponding Author Emailyfbai@ibcas.ac.cn
OABronze
Citation statistics
Cited Times:58[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ibcas.ac.cn/handle/2S10CLM1/19394
Collection植被与环境变化国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
2.Nanchang Univ, Inst Life Sci, Ctr Watershed Ecol, Jiangxi Prov Key Lab Watershed Ecosyst Change & B, Nanchang, Jiangxi, Peoples R China
3.Nanchang Univ, Sch Life Sci, Nanchang, Jiangxi, Peoples R China
4.Univ Nebraska Kearney, Dept Biol, Kearney, NE USA
5.Inner Mongolia Autonomous Reg, Grassland Stn Xilinhot, Xilinhot, Inner Mongolia, Peoples R China
6.North Carolina State Univ, Dept Plant Pathol, Raleigh, NC USA
Recommended Citation
GB/T 7714
Chen, Dima,Xing, Wen,Lan, Zhichun,et al. Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi-arid grassland[J]. FUNCTIONAL ECOLOGY,2019,33(1):175-187.
APA Chen, Dima.,Xing, Wen.,Lan, Zhichun.,Saleem, Muhammad.,Wu, Yunqiqige.,...&Bai, Yongfei.(2019).Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi-arid grassland.FUNCTIONAL ECOLOGY,33(1),175-187.
MLA Chen, Dima,et al."Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi-arid grassland".FUNCTIONAL ECOLOGY 33.1(2019):175-187.
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