Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi-arid grassland

doi:10.1111/1365-2435.13226

CORC > 植物研究所 > 中国科学院植物研究所 > 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, Zhichun 3,4; Saleem, Muhammad 2; Wu, Yunqiqige 1; Hu, Shuijin 6; Bai, Yongfei
刊名	FUNCTIONAL ECOLOGY
	2019
卷号	33 期号:1 页码:175-187
关键词	below-ground carbon allocation below-ground communities mass ratio hypothesis plant-soil interactions soil acidification soil food web trophic groups
ISSN号	0269-8463
DOI	10.1111/1365-2435.13226
文献子类	Article
英文摘要	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.
学科主题	Ecology
电子版国际标准刊号	1365-2435
出版地	HOBOKEN
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
语种	英语
出版者	WILEY
WOS记录号	WOS:000456691600016
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]
内容类型	期刊论文
源URL	[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.Univ Nebraska Kearney, Dept Biol, Kearney, NE USA 2.Nanchang Univ, Sch Life Sci, Nanchang, Jiangxi, Peoples R China 3.Nanchang Univ, Inst Life Sci, Ctr Watershed Ecol, Jiangxi Prov Key Lab Watershed Ecosyst Change & B, Nanchang, Jiangxi, Peoples R China 4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 5.North Carolina State Univ, Dept Plant Pathol, Raleigh, NC USA 6.Inner Mongolia Autonomous Reg, Grassland Stn Xilinhot, Xilinhot, Inner Mongolia, Peoples R China
推荐引用方式 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.