globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.14164
Scopus记录号: 2-s2.0-85047468918
论文题名:
Hydraulic redistribution affects modeled carbon cycling via soil microbial activity and suppressed fire
作者: Fu C.; Wang G.; Bible K.; Goulden M.L.; Saleska S.R.; Scott R.L.; Cardon Z.G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期:8
起始页码: 3472
结束页码: 3485
语种: 英语
英文关键词: decomposition ; heterotrophic respiration ; hydraulic descent ; hydraulic lift ; hydraulic redistribution ; NEE ; nutrient limitation
Scopus关键词: carbon cycle ; carbon flux ; decomposition ; hydraulics ; microbial activity ; respiration ; soil microorganism ; soil moisture ; soil nutrient
英文摘要: Hydraulic redistribution (HR) of water from moist to drier soils, through plant roots, occurs world-wide in seasonally dry ecosystems. Although the influence of HR on landscape hydrology and plant water use has been amply demonstrated, HR's effects on microbe-controlled processes sensitive to soil moisture, including carbon and nutrient cycling at ecosystem scales, remain difficult to observe in the field and have not been integrated into a predictive framework. We incorporated a representation of HR into the Community Land Model (CLM4.5) and found the new model improved predictions of water, energy, and system-scale carbon fluxes observed by eddy covariance at four seasonally dry yet ecologically diverse temperate and tropical AmeriFlux sites. Modeled plant productivity and microbial activities were differentially stimulated by upward HR, resulting at times in increased plant demand outstripping increased nutrient supply. Modeled plant productivity and microbial activities were diminished by downward HR. Overall, inclusion of HR tended to increase modeled annual ecosystem uptake of CO2 (or reduce annual CO2 release to the atmosphere). Moreover, engagement of CLM4.5′s ground-truthed fire module indicated that though HR increased modeled fuel load at all four sites, upward HR also moistened surface soil and hydrated vegetation sufficiently to limit the modeled spread of dry season fire and concomitant very large CO2 emissions to the atmosphere. Historically, fire has been a dominant ecological force in many seasonally dry ecosystems, and intensification of soil drought and altered precipitation regimes are expected for seasonally dry ecosystems in the future. HR may play an increasingly important role mitigating development of extreme soil water potential gradients and associated limitations on plant and soil microbial activities, and may inhibit the spread of fire in seasonally dry ecosystems. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110297
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Civil & Environmental Engineering, Center for Environmental Science and Engineering, University of Connecticut, Storrs, CT, United States; Forest Service, Pacific Northwest Research Station, Portland, OR, United States; Department of Earth System Science, University of California, Irvine, CA, United States; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States; Southwest Watershed Research Center, USDA-Agricultural Research Service, Tucson, AZ, United States; The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, United States; Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China

Recommended Citation:
Fu C.,Wang G.,Bible K.,et al. Hydraulic redistribution affects modeled carbon cycling via soil microbial activity and suppressed fire[J]. Global Change Biology,2018-01-01,24(8)
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