Arid
DOI10.1080/15324982.2021.1952660
Shrub influence on soil carbon and nitrogen in a semi-arid grassland is mediated by precipitation and largely insensitive to livestock grazing
Throop, Heather L.; Munson, Seth; Hornslein, Nicole; McClaran, Mitchel P.
Corresponding AuthorThroop, HL (corresponding author), Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85281 USA.
JournalARID LAND RESEARCH AND MANAGEMENT
ISSN1532-4982
EISSN1532-4990
Year Published2021-07
Abstract in EnglishDryland (arid and semi-arid) ecosystems globally provide more than half of livestock production and store roughly one-third of soil organic carbon (SOC). Biogeochemical pools are changing due to shrub encroachment, livestock grazing, and climate change. We assessed how vegetation microsite, grazing, and precipitation interacted to affect SOC and total nitrogen (TN) at a site with long-term grazing manipulations and well-described patterns of shrub encroachment across elevation and mean annual precipitation (MAP) gradients. We analyzed SOC and TN in the context of vegetation cover at ungrazed locations within livestock exclosures, high-intensity grazing locations near water sources, and moderate-intensity grazing locations away from water. SOC was enhanced by MAP (p < 0.0001), but grazing intensity had little effect regardless of MAP (p = 0.12). Shrubs enhanced SOC (300-1279 g C m(-2)) and TN (27-122 g N m(-2)), except at high MAP where the contribution or stabilization of shrub inputs relative to grassland inputs was likely diminished. Cover of perennial herbaceous plants and litter were significant predictors of SOC (r(2) = 0.63 and 0.34, respectively) and TN (r(2) = 0.64 and 0.30, respectively). Our results suggest that continued shrub encroachment in drylands can increase SOC storage when grass production remains high, although this response may saturate with higher MAP. In contrast, grazing - at least at the intensities of our sites - has a lesser effect. These effects underscore the need to understand how future climate and grazing may interact to influence dryland biogeochemical cycling.
Keyword in EnglishBush encroachment dryland piosphere precipitation gradient Prosopis soil organic carbon
SubtypeArticle ; Early Access
Language英语
Indexed BySCI-E
WOS IDWOS:000675795700001
WOS KeywordWOODY PLANT ENCROACHMENT ; ORGANIC-MATTER TURNOVER ; VEGETATION CHANGE ; ECOSYSTEM STRUCTURE ; TEMPORAL-CHANGES ; GREAT-PLAINS ; IMPACTS ; DESERT ; MESQUITE ; PATTERNS
WOS SubjectEnvironmental Sciences ; Soil Science
WOS Research AreaEnvironmental Sciences & Ecology ; Agriculture
Source InstitutionUniversity of Arizona ; United States Geological Survey ; Arizona State University
Document Type期刊论文
Identifierhttp://119.78.100.177/qdio/handle/2XILL650/362608
Affiliation[Throop, Heather L.; Hornslein, Nicole] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85281 USA; [Throop, Heather L.] Arizona State Univ, Sch Life Sci, Tempe, AZ USA; [Munson, Seth] US Geol Survey, Southwest Biol Sci Ctr, Flagstaff, AZ 86001 USA; [McClaran, Mitchel P.] Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ USA
Recommended Citation
GB/T 7714
Throop, Heather L.,Munson, Seth,Hornslein, Nicole,et al. Shrub influence on soil carbon and nitrogen in a semi-arid grassland is mediated by precipitation and largely insensitive to livestock grazing[J]. University of Arizona, United States Geological Survey, Arizona State University,2021.
APA Throop, Heather L.,Munson, Seth,Hornslein, Nicole,&McClaran, Mitchel P..(2021).Shrub influence on soil carbon and nitrogen in a semi-arid grassland is mediated by precipitation and largely insensitive to livestock grazing.ARID LAND RESEARCH AND MANAGEMENT.
MLA Throop, Heather L.,et al."Shrub influence on soil carbon and nitrogen in a semi-arid grassland is mediated by precipitation and largely insensitive to livestock grazing".ARID LAND RESEARCH AND MANAGEMENT (2021).
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