气候变化领域集成服务门户(CCPortal): Influence of multi-decadal land use; irrigation practices and climate on riparian corridors across the Upper Missouri River headwaters basin; Montana

CCPortal

DOI	10.5194/hess-23-4269-2019
	Influence of multi-decadal land use; irrigation practices and climate on riparian corridors across the Upper Missouri River headwaters basin; Montana
	Vanderhoof M.K.; Christensen J.R.; Alexander L.C.
发表日期	2019
ISSN	1027-5606
起始页码	4269
结束页码	4292
卷号	23 期号:10
英文摘要	The Upper Missouri River headwaters (UMH) basin (36 400 km2) depends on its river corridors to support irrigated agriculture and world-class trout fisheries. We evaluated trends (1984-2016) in riparian wetness, an indicator of the riparian condition, in peak irrigation months (June, July and August) for 158 km2 of riparian area across the basin using the Landsat normalized difference wetness index (NDWI). We found that 8 of the 19 riparian reaches across the basin showed a significant drying trend over this period, including all three basin outlet reaches along the Jefferson, Madison and Gallatin rivers. The influence of upstream climate was quantified using per reach random forest regressions. Much of the interannual variability in the NDWI was explained by climate, especially by drought indices and annual precipitation, but the significant temporal drying trends persisted in the NDWI-climate model residuals, indicating that trends were not entirely attributable to climate. Over the same period we documented a basin-wide shift from 9% of agriculture irrigated with center-pivot irrigation to 50% irrigated with center-pivot irrigation. Riparian reaches with a drying trend had a greater increase in the total area with center-pivot irrigation (within reach and upstream from the reach) relative to riparian reaches without such a trend (p < 0:05). The drying trend, however, did not extend to river discharge. Over the same period, stream gages (n D 7) showed a positive correlation with riparian wetness (p < 0:05) but no trend in summer river discharge, suggesting that riparian areas may be more sensitive to changes in irrigation return flows relative to river discharge. Identifying trends in riparian vegetation is a critical precursor for enhancing the resiliency of river systems and associated riparian corridors. © 2019 Author(s).
语种	英语
scopus关键词	Climate models; Decision trees; Drying; Fisheries; Irrigation; Land use; Wetlands; Center-pivot irrigation; Interannual variability; Irrigated agriculture; Irrigation practices; Irrigation return flows; Normalized differences; Positive correlations; Upper missouri rivers; Rivers; annual variation; drought stress; headwater; irrigation system; land use change; Landsat; riparian vegetation; riparian zone; salmonid fishery; seasonality; Gallatin River; Madison River; Missouri River; Montana; United States; Salmonidae
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159588
作者单位	Vanderhoof, M.K., Geosciences and Environmental Change Science Center, US Geological Survey, P.O. Box 25046, Denver, CO 80225, United States; Christensen, J.R., National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency, 26 W. Martin Luther King Dr., Cincinnati, OH 45268, United States; Alexander, L.C., National Center for Environmental Assessment, Office of Research and Development, US Environmental Protection Agency, 1200 Pennsylvania Ave NW (8623-P), Washington, DC 20460, United States
推荐引用方式 GB/T 7714	Vanderhoof M.K.,Christensen J.R.,Alexander L.C.. Influence of multi-decadal land use; irrigation practices and climate on riparian corridors across the Upper Missouri River headwaters basin; Montana[J],2019,23(10).
APA	Vanderhoof M.K.,Christensen J.R.,&Alexander L.C..(2019).Influence of multi-decadal land use; irrigation practices and climate on riparian corridors across the Upper Missouri River headwaters basin; Montana.Hydrology and Earth System Sciences,23(10).
MLA	Vanderhoof M.K.,et al."Influence of multi-decadal land use; irrigation practices and climate on riparian corridors across the Upper Missouri River headwaters basin; Montana".Hydrology and Earth System Sciences 23.10(2019).