干旱区生态环境知识资源中心(Arid): Temporal and elevation trends in rainfall erosivity on a 149 km~2 watershed in a semi-arid region of the American Southwest

Arid

	Temporal and elevation trends in rainfall erosivity on a 149 km~2 watershed in a semi-arid region of the American Southwest
	Nearingn Mark A; Unkrich Carl L; Goodrich Dave C; Nichols Mary H; Keefer Tim O
来源期刊	International Soil and Water Conservation Research
ISSN	2095-6339
出版年	2015
卷号	3 期号:2 页码:77-85
英文摘要	Temporal changes in rainfall erosivity can be expected to occur with changing climate, and because rainfall amounts are known to be in part of a function of elevation, erosivity can be expected to be influenced by elevation as well. This is particularly true in mountainous regions such as are found over much of the western United States. The objective of this study was to identify temporal and elevation trends in rainfall erosivity on a 149 km~2 (58 miles~2) watershed in a semi-arid region of southeastern Arizona. Data from 84 rain gages for the years 1960-2012 at elevations ranging from 1231 to 1644 m (4038-5394 ft) were used in the analyses. The average annual erosivity over the watershed as a whole was 1104 MJ mm ha~(-1) h~(-1) yr~(-1) (65 hundreds of foot ton inch acre~(-1) h~(-1) yr~(-1)), and ranged from approximately 950 to 1225 MJ mm ha~(-1) h~(-1) yr~(-1) (56-72 hundreds of foot ton inch acre~(-1) h~(-1) yr~(-1)), with a statistical trend showing greater erosivity at the higher elevations. No statistically significant temporal changes in annual or summer erosivities were found. This result stands in contrast to recent modeling studies of runoff and erosion in the area based on downscaled GCM information that project significant levels of erosivity changes over coming decades. These results are consistent with known orographic rainfall effects, but contrast with recent studies that presented projections of significant trends of increasing erosivity in the future based on downscaled GCM outputs for the area. The results illustrate the need for testing and developing improved techniques to evaluate future erosion scenarios for purposes of making targeted soil conservation decisions.
英文关键词	Climate change R-factor RUSLE Semiarid Soil erosion Walnut Gulch
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5538614
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335559
作者单位	Nearingn Mark A, USDA-ARS Southwest Watershed Research Center, Tucson, 85719, USA.; Unkrich Carl L, USDA-ARS Southwest Watershed Research Center, Tucson, 85719, USA.; Goodrich Dave C, USDA-ARS Southwest Watershed Research Center, Tucson, 85719, USA.; Nichols Mary H, USDA-ARS Southwest Watershed Research Center, Tucson, 85719, USA.; Keefer Tim O, USDA-ARS Southwest Watershed Research Center, Tucson, 85719, USA.
推荐引用方式 GB/T 7714	Nearingn Mark A,Unkrich Carl L,Goodrich Dave C,et al. Temporal and elevation trends in rainfall erosivity on a 149 km~2 watershed in a semi-arid region of the American Southwest[J],2015,3(2):77-85.
APA	Nearingn Mark A,Unkrich Carl L,Goodrich Dave C,Nichols Mary H,&Keefer Tim O.(2015).Temporal and elevation trends in rainfall erosivity on a 149 km~2 watershed in a semi-arid region of the American Southwest.International Soil and Water Conservation Research,3(2),77-85.
MLA	Nearingn Mark A,et al."Temporal and elevation trends in rainfall erosivity on a 149 km~2 watershed in a semi-arid region of the American Southwest".International Soil and Water Conservation Research 3.2(2015):77-85.