干旱区生态环境知识资源中心(Arid): Modeling Soil Nitrogen Content in South Patagonia across a Climate Gradient, Vegetation Type, and Grazing

Arid

DOI	10.3390/su11092707
	Modeling Soil Nitrogen Content in South Patagonia across a Climate Gradient, Vegetation Type, and Grazing
	Peri, Pablo L.1,2; Rosas, Yamina M.3; Ladd, Brenton 4; Toledo, Santiago 2; Lasagno, Romina G.1; Martinez Pastur, Guillermo 3
通讯作者	Peri, Pablo L. ; Ladd, Brenton
来源期刊	SUSTAINABILITY
EISSN	2071-1050
出版年	2019
卷号	11 期号:9
英文摘要	Soil total nitrogen (N) stock in rangelands, shrublands, and forests support key ecological functions such as the capacity of the land to sustain plant and animal productivity and ecosystem services. The objective of this study was to model soil total N stocks and soil C/N ratio from 0-30 cm depth across the region using freely accessible information on topography, climate, and vegetation with a view to establishing a baseline against which sustainable land management practices can be evaluated in Southern Patagonia. We used stepwise multiple regression to determine which independent variables best explained soil total N variation across the landscape in Southern Patagonia. We then used multiple regression models to upscale and produce maps of soil total N and C/N across the Santa Cruz province. Soil total N stock to 30 cm ranged from 0.13 to 2.21 kg N m(-2), and soil C/N ratios ranged from 4.5 to 26.8. The model for variation of soil total N stock explained 88% of the variance on the data and the most powerful predictor variables were: isothermality, elevation, and vegetation cover (normalized difference vegetation index (NDVI)). Soil total N and soil C/N ratios were allocated to three categories (low, medium, high) and these three levels were used to map the variation of soil total N and soil C/N ratios across Southern Patagonia. The results demonstrate that soil total N decreases as desertification increases, probably due to erosional processes, and that soil C/N is lower at low temperatures and increased with increasing precipitation. Soil total N and soil C/N ratios are critical variables that determine system capacity for productivity, especially the provisioning ecosystem services, and can serve as baselines against which efforts to adopt more sustainable land management practices in Patagonia can be assessed.
英文关键词	soil total nitrogen rangeland livestock climate native forest land-use
类型	Article
语种	英语
国家	Argentina ; Peru
开放获取类型	Green Published, Green Submitted, gold
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000469518700255
WOS关键词	ORGANIC-CARBON ; LITTER DECOMPOSITION ; ALTITUDINAL GRADIENT ; LAND MANAGEMENT ; TEMPERATURE ; DYNAMICS ; STOCKS ; MINERALIZATION ; ECOSYSTEMS ; INTENSITY
WOS类目	Green & Sustainable Science & Technology ; Environmental Sciences ; Environmental Studies
WOS研究方向	Science & Technology - Other Topics ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219002
作者单位	1.INTA, RA-9400 Rio Gallegos, Argentina; 2.UNPA, CONICET, RA-9400 Rio Gallegos, Argentina; 3.Ctr Austral Invest Cient CADIC CONICET, Lab Recursos Agroforestales, RA-9410 Ushuaia, Argentina; 4.Univ Cient, Escuela Agroforesteria, Lima 33, Peru
推荐引用方式 GB/T 7714	Peri, Pablo L.,Rosas, Yamina M.,Ladd, Brenton,et al. Modeling Soil Nitrogen Content in South Patagonia across a Climate Gradient, Vegetation Type, and Grazing[J],2019,11(9).
APA	Peri, Pablo L.,Rosas, Yamina M.,Ladd, Brenton,Toledo, Santiago,Lasagno, Romina G.,&Martinez Pastur, Guillermo.(2019).Modeling Soil Nitrogen Content in South Patagonia across a Climate Gradient, Vegetation Type, and Grazing.SUSTAINABILITY,11(9).
MLA	Peri, Pablo L.,et al."Modeling Soil Nitrogen Content in South Patagonia across a Climate Gradient, Vegetation Type, and Grazing".SUSTAINABILITY 11.9(2019).