干旱区生态环境知识资源中心(Arid): Shrub influence on soil carbon and nitrogen in a semi-arid grassland is mediated by precipitation and largely insensitive to livestock grazing

Arid

DOI	10.1080/15324982.2021.1952660
	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.
通讯作者	Throop, HL (corresponding author), Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85281 USA.
来源期刊	ARID LAND RESEARCH AND MANAGEMENT
ISSN	1532-4982
EISSN	1532-4990
出版年	2021-07
英文摘要	Dryland (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.
英文关键词	Bush encroachment dryland piosphere precipitation gradient Prosopis soil organic carbon
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000675795700001
WOS关键词	WOODY PLANT ENCROACHMENT ; ORGANIC-MATTER TURNOVER ; VEGETATION CHANGE ; ECOSYSTEM STRUCTURE ; TEMPORAL-CHANGES ; GREAT-PLAINS ; IMPACTS ; DESERT ; MESQUITE ; PATTERNS
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
来源机构	University of Arizona ; United States Geological Survey ; Arizona State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362608
作者单位	[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
推荐引用方式 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).