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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
发表期刊FUNCTIONAL ECOLOGY
ISSN0269-8463
卷号33期号:1页码:175-187
摘要Semi-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.
关键词below-ground carbon allocation below-ground communities mass ratio hypothesis plant-soil interactions soil acidification soil food web trophic groups
学科领域Ecology
DOI10.1111/1365-2435.13226
收录类别SCI
语种英语
WOS关键词BELOW-GROUND COMMUNITIES ; PLANT DIVERSITY ; MICROBIAL COMMUNITIES ; BACTERIAL COMMUNITIES ; FUNGAL DIVERSITY ; ELEVATED CO2 ; FOOD WEBS ; FERTILIZATION ; DEPOSITION ; PRODUCTIVITY
WOS研究方向Environmental Sciences & Ecology
WOS记录号WOS:000456691600016
出版者WILEY
文献子类Article
出版地HOBOKEN
EISSN1365-2435
资助机构Youth 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]
作者邮箱yfbai@ibcas.ac.cn
作品OA属性Bronze
引用统计
被引频次:111[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/2S10CLM1/19394
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, 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
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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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