气候变化领域集成服务门户(CCPortal): Groundwater dependence of riparian woodlands and the disrupting effect of anthropogenically altered streamflow

CCPortal

DOI	10.1073/pnas.2026453118
	Groundwater dependence of riparian woodlands and the disrupting effect of anthropogenically altered streamflow
	Rohde M.M.; Stella J.C.; Roberts D.A.; Singer M.B.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:25
英文摘要	Riparian ecosystems fundamentally depend on groundwater, especially in dryland regions, yet their water requirements and sources are rarely considered in water resource management decisions. Until recently, technological limitations and data gaps have hindered assessment of groundwater influences on riparian ecosystem health at the spatial and temporal scales relevant to policy and management. Here, we analyze Sentinel-2–derived normalized difference vegetation index (NDVI; n = 5,335,472 observations), field-based groundwater elevation (n = 32,051 observations), and streamflow alteration data for riparian woodland communities (n = 22,153 polygons) over a 5-y period (2015 to 2020) across California. We find that riparian woodlands exhibit a stress response to deeper groundwater, as evidenced by concurrent declines in greenness represented by NDVI. Furthermore, we find greater seasonal coupling of canopy greenness to groundwater for vegetation along streams with natural flow regimes in comparison with anthropogenically altered streams, particularly in the most water-limited regions. These patterns suggest that many riparian woodlands in California are subsidized by water management practices. Riparian woodland communities rely on naturally variable groundwater and streamflow components to sustain key ecological processes, such as recruitment and succession. Altered flow regimes, which stabilize streamflow throughout the year and artificially enhance water supplies to riparian vegetation in the dry season, disrupt the seasonal cycles of abiotic drivers to which these Mediterranean forests are adapted. Consequently, our analysis suggests that many riparian ecosystems have become reliant on anthropogenically altered flow regimes, making them more vulnerable and less resilient to rapid hydrologic change, potentially leading to future riparian forest loss across increasingly stressed dryland regions. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Riparian vegetation \| groundwater \| streamflow \| NDVI \| California
语种	英语
scopus关键词	ground water; abiotic stress; Article; California; canopy; community succession; dry season; ecosystem resilience; environmental stress; environmental sustainability; evolutionary adaptation; forest; human activities; hydrology; riparian ecosystem; seasonal variation; stream (river); technology; vegetation dynamics; water flow; water management; water supply
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238518
作者单位	Graduate Program in Environmental Science, State University of New York College of Environmental Science and Forestry, Syracuse, NY 13210, United States; CaliforniaWater Program, Nature Conservancy, Sacramento, CA 95811, United States; Department of Sustainable Resources Management, State University of New YorkCollege of Environmental Science and Forestry, Syracuse, NY 13210, United States; Department of Geography, University of California, Santa Barbara, CA 93106, United States; School of Earth and Environmental Sciences, Cardiff University, Cardiff, CF10 3AT, United Kingdom; Water Research Institute, Cardiff University, Cardiff, CF10 3AX, United Kingdom; Earth Research Institute, University of California, Santa Barbara, CA 93106, United States
推荐引用方式 GB/T 7714	Rohde M.M.,Stella J.C.,Roberts D.A.,et al. Groundwater dependence of riparian woodlands and the disrupting effect of anthropogenically altered streamflow[J],2021,118(25).
APA	Rohde M.M.,Stella J.C.,Roberts D.A.,&Singer M.B..(2021).Groundwater dependence of riparian woodlands and the disrupting effect of anthropogenically altered streamflow.Proceedings of the National Academy of Sciences of the United States of America,118(25).
MLA	Rohde M.M.,et al."Groundwater dependence of riparian woodlands and the disrupting effect of anthropogenically altered streamflow".Proceedings of the National Academy of Sciences of the United States of America 118.25(2021).