气候变化领域集成服务门户(CCPortal): Effects of Irrigation on Water, Carbon, and Nitrogen Budgets in a Semiarid Watershed in the Pacific Northwest: A Modeling Study

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DOI	10.1029/2019MS001953
	Effects of Irrigation on Water, Carbon, and Nitrogen Budgets in a Semiarid Watershed in the Pacific Northwest: A Modeling Study
	Zhu B.; Huang M.; Cheng Y.; Xie X.; Liu Y.; Zhang X.; Bisht G.; Chen X.; Missik J.; Liu H.
发表日期	2020
ISSN	19422466
卷号	12 期号:9
英文摘要	In this study, we use the Community Land Model Version 5 (CLM5) to investigate how irrigation modulates hydrologic and biogeochemical dynamics in the Upper Columbia-Priest Rapids (UCPR) watershed, a typical semiarid watershed located in the northwestern United States dominated by cropland. To our knowledge, this constitutes the first application of CLM5 with landscape heterogeneity fully resolved over a watershed. The model is calibrated and evaluated against flux measurements from an AmeriFlux site and the Moderate Resolution Imaging Spectroradiometer (MODIS) products. Two numerical experiments (i.e., irrigated and rainfed) are performed at hyperresolution (~1 km) over the period of 2010–2018, accounting for realistic crop types and management practices. Our results show that irrigation fundamentally alters hydrologic and biogeochemical dynamics of the watershed. By adding 79.6 mm year−1 water in addition to the mean annual precipitation of 204.0 mm year−1, irrigation leads to increases in evapotranspiration and runoff, accompanied by shallower groundwater table depths. Increases in crop productivity in response to irrigation result in more carbon storage in the watershed, and drastically large seasonal fluctuations in soil organic carbon in response to changes in soil temperature and moisture. Irrigation also intensifies the rate of denitrification and mineralization during the growing season, enhancing the interactions between soil mineral nitrogen, the atmosphere, and freshwater systems. Our study demonstrates the potential of CLM5 as an effective tool for understanding hydrological and biogeochemical dynamics in highly managed semiarid watersheds. © 2020. The Authors.
英文关键词	biogeochemistry; CLM5; irrigation; semiarid watershed; water
语种	英语
scopus关键词	Biogeochemistry; Budget control; Crops; Dynamics; Forestry; Groundwater; Nitrogen; Organic carbon; Radiometers; Soils; Watersheds; Biogeochemical dynamics; Community land models; Groundwater table depth; Landscape heterogeneities; Mean annual precipitation; Moderate resolution imaging spectroradiometer; Northwestern United States; Numerical experiments; Irrigation; calibration; carbon storage; denitrification; evapotranspiration; growing season; MODIS; numerical model; soil temperature; watershed; Columbia [Missouri]; Missouri; Pacific Northwest; United States; United States
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156642
作者单位	State Key Laboratory of Remote Sensing Science, Faculty of Geographical Science, Beijing Normal University, Beijing, China; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States; Laboratory for Atmospheric Research, Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, United States
推荐引用方式 GB/T 7714	Zhu B.,Huang M.,Cheng Y.,et al. Effects of Irrigation on Water, Carbon, and Nitrogen Budgets in a Semiarid Watershed in the Pacific Northwest: A Modeling Study[J],2020,12(9).
APA	Zhu B..,Huang M..,Cheng Y..,Xie X..,Liu Y..,...&Liu H..(2020).Effects of Irrigation on Water, Carbon, and Nitrogen Budgets in a Semiarid Watershed in the Pacific Northwest: A Modeling Study.Journal of Advances in Modeling Earth Systems,12(9).
MLA	Zhu B.,et al."Effects of Irrigation on Water, Carbon, and Nitrogen Budgets in a Semiarid Watershed in the Pacific Northwest: A Modeling Study".Journal of Advances in Modeling Earth Systems 12.9(2020).