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Seasonally pulsed heterogeneity in microclimate; phenology and cover effects along deciduous grassland-forest continuum

Juan Camilo Villegas, David D. Breshears, Chris B. Zou and Patrick D. Royer
Seasonally pulsed heterogeneity in microclimate; phenology and cover effects along deciduous grassland-forest continuum (in Coupling soil science and hydrology with ecology, Michael H. Young (prefacer), David A. Robinson (prefacer) and Ronald J. Ryel (prefacer))
Vadose Zone Journal (August 2010) 9 (3): 537-547

Abstract

Much of the terrestrial biosphere can be viewed as part of a gradient, with varying amounts of woody plant cover ranging from grassland to forest--the grassland-forest continuum. Woody plant cover directly impacts the soil microclimate through modifications of near-ground solar radiation and soil temperature, and these interactive effects are relevant for key ecohydrological processes such as soil evaporation. Trends in how increasing woody plant cover affect soil surface microclimate have recently been evaluated for gradients of evergreen woody plants, but analogous trends for deciduous plants, where phenology should be influential, are lacking. We evaluated season-dependent changes in soil microclimate along a deciduous grassland-forest continuum of velvet mesquite (Prosopis velutina Wooton) using repeated hemispherical photography and continuous soil temperature measurements at the 5-cm depth. Both near-ground solar radiation and soil temperature decreased with increasing canopy cover, even during the leafless season. The trends varied substantially among seasons, however, with differences between canopy and intercanopy patches readily evident only during the period of full leaf-out, during which the correlation between near-ground solar radiation and soil temperature was strongest. Our results provide a more comprehensive understanding about the interactions of canopy cover, canopy structure attributes, and plant phenology that produce seasonally pulsed heterogeneity in the soil surface microclimate. Notably, our results add a new dimension to the moisture "pulse dynamics" perspective commonly applied to dryland ecohydrology, highlighting seasonally pulsed heterogeneity in soil microclimate that could influence soil moisture dynamics in drylands.


ISSN: 1539-1663
Serial Title: Vadose Zone Journal
Serial Volume: 9
Serial Issue: 3
Title: Seasonally pulsed heterogeneity in microclimate; phenology and cover effects along deciduous grassland-forest continuum
Title: Coupling soil science and hydrology with ecology
Author(s): Villegas, Juan CamiloBreshears, David D.Zou, Chris B.Royer, Patrick D.
Author(s): Young, Michael H.prefacer
Author(s): Robinson, David A.prefacer
Author(s): Ryel, Ronald J.prefacer
Affiliation: University of Arizona, School of Natural Resources and the Environment, Tucson, AZ, United States
Affiliation: Desert Research Institute, Division of Hydrologic Sciences, Las Vegas, NV, United States
Pages: 537-547
Published: 201008
Text Language: English
Publisher: Soil Science Society of America, Madison, WI, United States
References: 52
Accession Number: 2010-088898
Categories: Environmental geologySoils
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Source Medium: WWW
N31°46'60" - N31°46'60", W110°49'60" - W110°49'60"
Secondary Affiliation: Environment Centre Wales, GBR, United KingdomUtah State University, USA, United StatesOklahoma State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201047
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