气候变化领域集成服务门户(CCPortal): Priming of Soil Carbon Decomposition in Two Inner Mongolia Grassland Soils following Sheep Dung Addition: A Study Using C-13 Natural Abundance Approach

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DOI	10.1371/journal.pone.0078578
	Priming of Soil Carbon Decomposition in Two Inner Mongolia Grassland Soils following Sheep Dung Addition: A Study Using C-13 Natural Abundance Approach
	Ma, Xiuzhi; Ambus, Per; Wang, Shiping; Wang, Yanfen; Wang, Chengjie
通讯作者	Wang, SP (通讯作者)
发表日期	2013
ISSN	1932-6203
卷号	8 期号:11
英文摘要	To investigate the effect of sheep dung on soil carbon (C) sequestration, a 152 days incubation experiment was conducted with soils from two different Inner Mongolian grasslands, i.e. a Leymus chinensis dominated grassland representing the climax community (2.1% organic matter content) and a heavily degraded Artemisia frigida dominated community (1.3% organic matter content). Dung was collected from sheep either fed on L. chinensis (C-3 plant with delta C-13= -26.8%; dung delta C-13= -26.2%) or Cleistogenes squarrosa (C-4 plant with delta C-13= -14.6%; dung delta C-13= -15.7%). Fresh C-3 and C-4 sheep dung was mixed with the two grassland soils and incubated under controlled conditions for analysis of C-13-CO2 emissions. Soil samples were taken at days 17, 43, 86, 127 and 152 after sheep dung addition to detect the delta C-13 signal in soil and dung components. Analysis revealed that 16.9% and 16.6% of the sheep dung C had decomposed, of which 3.5% and 2.8% was sequestrated in the soils of L. chinensis and A. frigida grasslands, respectively, while the remaining decomposed sheep dung was emitted as CO2. The cumulative amounts of C respired from dung treated soils during 152 days were 7-8 times higher than in the un-amended controls. In both grassland soils, ca. 60% of the evolved CO2 originated from the decomposing sheep dung and 40% from the native soil C. Priming effects of soil C decomposition were observed in both soils, i.e. 1.4 g and 1.6 g additional soil C kg(-1) dry soil had been emitted as CO2 for the L. chinensis and A. frigida soils, respectively. Hence, the net C losses from L. chinensis and A. frigida soils were 0.6 g and 0.9 g C kg(-1) soil, which was 2.6% and 7.0% of the total C in L. chinensis and A. frigida grasslands soils, respectively. Our results suggest that grazing of degraded Inner Mongolian pastures may cause a net soil C loss due to the positive priming effect, thereby accelerating soil deterioration.
关键词	PIG SLURRY MICROBIAL BIOMASS SIZE FRACTIONS NITROUS-OXIDE N DYNAMICS CO2 QUANTIFICATION N2O MECHANISMS EMISSIONS
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000327254700021
来源期刊	PLOS ONE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258203
推荐引用方式 GB/T 7714	Ma, Xiuzhi,Ambus, Per,Wang, Shiping,et al. Priming of Soil Carbon Decomposition in Two Inner Mongolia Grassland Soils following Sheep Dung Addition: A Study Using C-13 Natural Abundance Approach[J]. 中国科学院青藏高原研究所,2013,8(11).
APA	Ma, Xiuzhi,Ambus, Per,Wang, Shiping,Wang, Yanfen,&Wang, Chengjie.(2013).Priming of Soil Carbon Decomposition in Two Inner Mongolia Grassland Soils following Sheep Dung Addition: A Study Using C-13 Natural Abundance Approach.PLOS ONE,8(11).
MLA	Ma, Xiuzhi,et al."Priming of Soil Carbon Decomposition in Two Inner Mongolia Grassland Soils following Sheep Dung Addition: A Study Using C-13 Natural Abundance Approach".PLOS ONE 8.11(2013).