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Title: Hydraulic redistribution affects modeled carbon cycling via soil microbial activity and suppressed fire

Journal Article · · Global Change Biology
DOI:https://doi.org/10.1111/gcb.14164· OSTI ID:1464431
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [4];  [5]; ORCiD logo [6]
  1. Department of Civil &, Environmental Engineering Center for Environmental Science and Engineering University of Connecticut Storrs Connecticut
  2. Forest Service Pacific Northwest Research Station Portland Oregon
  3. Department of Earth System Science University of California Irvine California
  4. Department of Ecology and Evolutionary Biology University of Arizona Tucson Arizona
  5. Southwest Watershed Research Center USDA‐Agricultural Research Service Tucson Arizona
  6. The Ecosystems Center Marine Biological Laboratory Woods Hole Massachusetts

Abstract 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 CO 2 (or reduce annual CO 2 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 CO 2 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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐SC0008182 ER65389
OSTI ID:
1464431
Journal Information:
Global Change Biology, Journal Name: Global Change Biology Vol. 24 Journal Issue: 8; ISSN 1354-1013
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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