Soil acidification exerts a greater control on soil respiration than soil nitrogen availability in grasslands subjected to long-term nitrogen enrichment

doi:10.1111/1365-2435.12525

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	Soil acidification exerts a greater control on soil respiration than soil nitrogen availability in grasslands subjected to long-term nitrogen enrichment
	Chen, Dima 1; Li, Jianjun ; Lan, Zhichun ; Hu, Shuijin 1; Bai, Yongfei
刊名	FUNCTIONAL ECOLOGY
	2016
卷号	30 期号:4 页码:658-669
关键词	base mineral cations below-ground carbon allocation microbial respiration plant functional group root nitrogen content root respiration root specific respiration soil microbial community
ISSN号	0269-8463
DOI	10.1111/1365-2435.12525
文献子类	Article
英文摘要	Terrestrial ecosystems worldwide are receiving increasing amounts of biologically reactive nitrogen (N) as a consequence of anthropogenic activities. This intended or unintended fertilization can have a wide-range of impacts on biotic communities and hence on soil respiration. Reduction in below-ground carbon (C) allocation induced by high N availability has been assumed to be a major mechanism determining the effects of N enrichment on soil respiration. In addition to increasing available N, however, N enrichment causes soil acidification, which may also affect root and microbial activities. The relative importance of increased N availability vs. soil acidification on soil respiration in natural ecosystems experiencing N enrichment is unclear. We conducted a 12-year N enrichment experiment and a 4-year complementary acid addition experiment in a semi-arid Inner Mongolian grassland. We found that N enrichment had contrasting effects on root and microbial respiration. N enrichment significantly increased root biomass, root N content and specific root respiration, thereby promoting root respiration. In contrast, N enrichment significantly suppressed microbial respiration likely by reducing total microbial biomass and changing the microbial community composition. The effect on root activities was due to both soil acidity and increased available N, while the effect on microbes primarily stemmed from soil acidity, which was further confirmed by results from the acid addition experiment. Our results indicate that soil acidification exerts a greater control than soil N availability on soil respiration in grasslands experiencing long-term N enrichment. These findings suggest that N-induced soil acidification should be included in predicting terrestrial ecosystem C balance under future N deposition scenarios.
学科主题	Ecology
电子版国际标准刊号	1365-2435
出版地	HOBOKEN
WOS关键词	ROOT RESPIRATION ; SUBTROPICAL PLANTATIONS ; MICROBIAL COMMUNITIES ; PLANT DIVERSITY ; CARBON STORAGE ; CO2 EFFLUX ; DEPOSITION ; ACID ; PRODUCTIVITY ; DECLINES
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	WILEY
WOS记录号	WOS:000373920800017
资助机构	Chinese National Key Development Program for Basic Research [2015CB954201] ; Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31320103916, 31030013] ; Strategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences [XDA05050400]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/25192]
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 100093, Peoples R China 2.N Carolina State Univ, Dept Plant Pathol, Box 7616, Raleigh, NC 27695 USA
推荐引用方式 GB/T 7714	Chen, Dima,Li, Jianjun,Lan, Zhichun,et al. Soil acidification exerts a greater control on soil respiration than soil nitrogen availability in grasslands subjected to long-term nitrogen enrichment[J]. FUNCTIONAL ECOLOGY,2016,30(4):658-669.
APA	Chen, Dima,Li, Jianjun,Lan, Zhichun,Hu, Shuijin,&Bai, Yongfei.(2016).Soil acidification exerts a greater control on soil respiration than soil nitrogen availability in grasslands subjected to long-term nitrogen enrichment.FUNCTIONAL ECOLOGY,30(4),658-669.
MLA	Chen, Dima,et al."Soil acidification exerts a greater control on soil respiration than soil nitrogen availability in grasslands subjected to long-term nitrogen enrichment".FUNCTIONAL ECOLOGY 30.4(2016):658-669.