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    Root density distribution and biomass allocation of co-occurring woody plants on contrasting soils in a subtropical savanna parkland

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    Author
    Zhou, Yong
    Watts, Stephen E.
    Boutton, Thomas W.
    Archer, Steven R.
    Affiliation
    Univ Arizona, Sch Nat Resources & Environm
    Issue Date
    2019-05
    Keywords
    Root distribution
    Soil profile
    Prosopis glandulosa
    Argillic horizon
    Woody patches
    Interspecific competition
    Subtropical savanna parkland
    Woody plant encroachment
    
    Metadata
    Show full item record
    Publisher
    SPRINGER
    Citation
    Zhou, Y., Watts, S. E., Boutton, T. W., & Archer, S. R. (2019). Root density distribution and biomass allocation of co-occurring woody plants on contrasting soils in a subtropical savanna parkland. Plant and Soil, 438(1-2), 263-279.
    Journal
    PLANT AND SOIL
    Rights
    © Springer Nature Switzerland AG 2019.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Background and aims: Root niche partitioning among trees/shrubs and grasses facilitates their coexistence in savannas, but little is known regarding root distribution patterns of co-occurring woody plants, and how they might differ on contrasting soils. Methods: We quantified root distributions of co-occurring shrubs to 2m on argillic and non-argillic soils. Results: Root biomass in the two shrub communities was 3- to 5- fold greater than that in the grassland community. Prosopis glandulosa, the dominant overstory species was deep-rooted, while the dominant understory shrub, Zanthoxylum fagara, was shallow-rooted (47% vs. 25% of root density at depths >0.4m). Shrubs on argillic soils had less aboveground and greater belowground mass than those on non-argillic soils. Root biomass and density on argillic soils was elevated at shallow (< 0.4m) depths, whereas root density of the same species on non-argillic soils were skewed to depths >0.4m. Root density decreased exponentially with increasing distance from woody patch perimeters. Conclusions: Belowground biomass (carbon) pools increased markedly with grassland-to-shrubland state change. The presence/absence of a restrictive barrier had substantial effects on root distributions and above- vs. belowground biomass allocation. Differences in root distribution patterns of co-occurring woody species would facilitate their co-existence.
    Note
    12 month embargo; first online: 11 March 2019
    ISSN
    0032-079X
    EISSN
    1573-5036
    DOI
    10.1007/s11104-019-04018-9
    Version
    Final accepted manuscript
    Sponsors
    NSF [BSR-9109240]; NASA [NAGW-2662]; NSF Doctoral Dissertation Improvement Grant [DEB/DDIG-1600790]; USDA/NIFA Hatch Project [1003961]; Sid Kyle Graduate Merit Assistantship from the Department of Ecosystem Science and Management; Tom Slick Graduate Research Fellowship from the College of Agriculture and Life Sciences, Texas AM University; Office of Graduate and Professional Studies at Texas AM University
    ae974a485f413a2113503eed53cd6c53
    10.1007/s11104-019-04018-9
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    UA Faculty Publications

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