Predominant control of moisture on soil organic carbon mineralization across a broad range of arid and semiarid ecosystems on the Mongolia plateau

doi:10.1007/s10980-014-0040-0

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	Predominant control of moisture on soil organic carbon mineralization across a broad range of arid and semiarid ecosystems on the Mongolia plateau
	Mi, Jia ; Li, Jianjun ; Chen, Dima ; Xie, Yichun 1; Bai, Yongfei
刊名	LANDSCAPE ECOLOGY
	2015
卷号	30 期号:9 页码:1683-1699
关键词	SOC mineralization Precipitation gradient Water filled pore space (WFPS) Temperature sensitivity of SOC mineralization Microbial biomass carbon
ISSN号	0921-2973
DOI	10.1007/s10980-014-0040-0
文献子类	Article
英文摘要	Soil moisture and temperature are known to be the two environmental constraints regulating mineralization of soil organic carbon (SOC). However, it remains unclear to what extent the moisture, temperature, and other abiotic and biotic factors affect the mineralization of SOC across broad geographic regions. Here, we examined the effects of multiple abiotic and biotic factors on SOC mineralization across 12 widespread arid and semiarid ecosystems on the Mongolia plateau, by using an integrative approach combining short-term laboratory incubations (28-day), field survey, and structure equation modeling (SEM). Our results showed that soil moisture had a predominant control on SOC mineralization across all sites. The average CO2 emissions over all sites increased by 23 % from 30 to 60 % water filled pore space (WFPS) and by 176 % from 60 to 90 % WFPS. Under conditions of 25 A degrees C and 60 % WFPS, the cumulative CO2-C emissions in the topsoil (0-20 cm) diminished in the following order: meadow steppe (227 mg kg(-1)) > typical steppe (216 mg kg(-1)) > desert (99 mg kg(-1)) > desert steppe (72 mg kg(-1)). The temperature sensitivity of SOC mineralization (Q(10)), the proportional change in carbon mineralization rate given a 10 A degrees C temperature gradient, was highest under conditions of low temperature and high moisture, but it was lowest under high temperature and low moisture. The SEM analyses demonstrate that the mineralization potential of SOC seems to be directly regulated by microbe activity and substrate availability. Climatic factors (e.g. mean annual precipitation, mean annual temperature), above- and belowground biomass, and soil pH, which regulate SOC and microbial biomass carbon content, also indirectly influence the SOC mineralization. Our results indicate that global climate change, particularly the increase in the frequency of extreme storms and droughts, will substantially affect SOC mineralization and ecosystem carbon cycle in arid and semiarid regions.
学科主题	Ecology ; Geography, Physical ; Geosciences, Multidisciplinary
电子版国际标准刊号	1572-9761
出版地	DORDRECHT
WOS关键词	TEMPERATURE SENSITIVITY ; MATTER DECOMPOSITION ; CLIMATE-CHANGE ; MICROBIAL BIOMASS ; EURASIAN STEPPE ; LABILE CARBON ; RESPIRATION ; VEGETATION ; NITROGEN ; DEPENDENCE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000361903500009
资助机构	Natural Science Foundation of China [31030013, 31320103916] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDA05050400] ; Land-Cover/Land-Use Program at NASA [NNX09AK87G]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/25650]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing 100093, Peoples R China 2.Eastern Michigan Univ, Dept Geog & Geol, Ypsilanti, MI 48197 USA
推荐引用方式 GB/T 7714	Mi, Jia,Li, Jianjun,Chen, Dima,et al. Predominant control of moisture on soil organic carbon mineralization across a broad range of arid and semiarid ecosystems on the Mongolia plateau[J]. LANDSCAPE ECOLOGY,2015,30(9):1683-1699.
APA	Mi, Jia,Li, Jianjun,Chen, Dima,Xie, Yichun,&Bai, Yongfei.(2015).Predominant control of moisture on soil organic carbon mineralization across a broad range of arid and semiarid ecosystems on the Mongolia plateau.LANDSCAPE ECOLOGY,30(9),1683-1699.
MLA	Mi, Jia,et al."Predominant control of moisture on soil organic carbon mineralization across a broad range of arid and semiarid ecosystems on the Mongolia plateau".LANDSCAPE ECOLOGY 30.9(2015):1683-1699.