2024-04-03 カリフォルニア大学サンタバーバラ校(UCSB)
＜関連情報＞
- https://news.ucsb.edu/in-focus/new-study-nature-water-puts-spotlight-importance-groundwater
- https://www.nature.com/articles/s44221-024-00221-w
地下水管理のための生態学的閾値と目標の設定 Establishing ecological thresholds and targets for groundwater management
Melissa M. Rohde,John C. Stella,Michael Bliss Singer,Dar A. Roberts,Kelly K. Caylor & Christine M. Albano
Nature Water Published:03 April 2024
DOI:https://doi.org/10.1038/s44221-024-00221-w
Abstract
Groundwater is critical for many ecosystems, yet groundwater requirements for dependent ecosystems are rarely accounted for during water and conservation planning. Here we compile 38 years of Landsat-derived normalized difference vegetation index (NDVI) to evaluate groundwater-dependent vegetation responses to changes in depth to groundwater (DTG) across California. To maximize applicability, we standardized raw NDVI and DTG values using Z scores to identify groundwater thresholds, groundwater targets and map potential drought refugia across a diversity of biomes and local conditions. Groundwater thresholds were analysed for vegetation impacts where ZNDVI dropped below −1. ZDTG thresholds and targets were then evaluated with respect to groundwater-dependent vegetation in different condition classes and rooting depths. ZNDVI scores were applied statewide to identify potential drought refugia supported by groundwater. Our approach provides a simple and robust methodology for water and conservation practitioners to support ecosystem water needs so biodiversity and sustainable water-management goals can be achieved.
