干旱区生态环境知识资源中心(Arid): Broad-Scale Patterns of Soil Carbon (C) Pools and Fluxes Across Semiarid Ecosystems are Linked to Climate and Soil Texture

Arid

DOI	10.1007/s10021-018-0299-0
	Broad-Scale Patterns of Soil Carbon (C) Pools and Fluxes Across Semiarid Ecosystems are Linked to Climate and Soil Texture
	Smith, Kenneth R.; Waring, Bonnie G.
通讯作者	Waring, Bonnie G.
来源期刊	ECOSYSTEMS
ISSN	1432-9840
EISSN	1435-0629
出版年	2019
卷号	22 期号:4 页码:742-753
英文摘要	Dryland (semiarid and arid) ecosystems are responsible for most of the interannual variation in atmospheric CO2 concentrations and contain a considerable fraction of the globe's soil carbon (C) stock. Despite their important contribution to the global land C sink, we have a poor mechanistic understanding of the processes that drive C cycling patterns in drylands. In this study in eastern Utah, we examined the natural variation of soil C pools and fluxes along semiorthogonal gradients of climate and soil texture in order to determine the pertinent environmental controls on soil C cycling dynamics. Our study revealed a high degree of collinearity among C stocks and fluxes, which were related to climate, vegetation, and soil clay content. Soil C pools were positively correlated with both soil clay content and precipitation, which in turn was linked to aboveground plant biomass. By contrast, enzyme activities were negatively associated with temperature. We observed a strong decoupling of C pools and fluxes (for example, total C, DOC, microbial biomass C, and respiration) from the enzyme activities involved in organic matter decomposition. Overall, our findings indicate that the within- and between-site variation of soil C pools across diverse dryland ecosystems was strongly linked to both climate and edaphic characteristics, but the high degree of local variability within sites could challenge interpretations of environmental controls at broader scales.
英文关键词	clay climate dryland ecosystems microbial biomass soil organic carbon
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000468963200004
WOS关键词	ORGANIC-CARBON ; TEMPERATURE-DEPENDENCE ; EXTRACTION METHOD ; ENZYME-ACTIVITY ; SANDY SOILS ; HUMIC ACIDS ; RESPIRATION ; NITROGEN ; MATTER ; PRECIPITATION
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215328
作者单位	Utah State Univ, Dept Biol, 5305 Old Main Hill, Logan, UT 84322 USA
推荐引用方式 GB/T 7714	Smith, Kenneth R.,Waring, Bonnie G.. Broad-Scale Patterns of Soil Carbon (C) Pools and Fluxes Across Semiarid Ecosystems are Linked to Climate and Soil Texture[J],2019,22(4):742-753.
APA	Smith, Kenneth R.,&Waring, Bonnie G..(2019).Broad-Scale Patterns of Soil Carbon (C) Pools and Fluxes Across Semiarid Ecosystems are Linked to Climate and Soil Texture.ECOSYSTEMS,22(4),742-753.
MLA	Smith, Kenneth R.,et al."Broad-Scale Patterns of Soil Carbon (C) Pools and Fluxes Across Semiarid Ecosystems are Linked to Climate and Soil Texture".ECOSYSTEMS 22.4(2019):742-753.