DOI: 10.1111/gcb.14403
Scopus记录号: 2-s2.0-85052376360
论文题名: Groundwater drawdown drives ecophysiological adjustments of woody vegetation in a semi-arid coastal ecosystem
作者: Antunes C. ; Chozas S. ; West J. ; Zunzunegui M. ; Diaz Barradas M.C. ; Vieira S. ; Máguas C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 10 起始页码: 4894
结束页码: 4908
语种: 英语
英文关键词: coastal dune ecosystem
; groundwater table depth
; photosynthetic activity
; physiological responses
; plant functional types
; plant water status
; water table lowering
; water-uptake depth
英文摘要: Predicted droughts and anthropogenic water use will increase groundwater lowering rates and intensify groundwater limitation, particularly for Mediterranean semi-arid ecosystems. These hydrological changes may be expected to elicit differential functional responses of vegetation either belowground or aboveground. Yet, our ability to predict the impacts of groundwater changes on these ecosystems is still poor. Thus, we sought to better understand the impact of falling water table on the physiology of woody vegetation. We specifically ask (a) how is woody vegetation ecophysiological performance affected by water table depth during the dry season? and (b) does the vegetation response to increasing depth to groundwater differ among water-use functional types? We examined a suite of physiological parameters and water-uptake depths of the dominant, functionally distinct woody vegetation along a water-table depth gradient in a Mediterranean semi-arid coastal ecosystem that is currently experiencing anthropogenic groundwater extraction pressure. We found that groundwater drawdown did negatively affect the ecophysiological performance of the woody vegetation. Across all studied environmental factors, depth to groundwater was the most important driver of ecophysiological adjustments. Plant functional types, independent of groundwater dependence, showed consistent declines in water content and generally reduced C and N acquisition with increasing depths to groundwater. Functional types showed distinct operating physiological ranges, but common physiological sensitivity to greater water table depth. Thus, although differences in water-source use exist, a physiological convergence appeared to happen among different functional types. These results strongly suggest that hydrological drought has an important impact on fundamental physiological processes, constraining the performance of woody vegetation under semi-arid conditions. By disentangling the functional responses and vulnerability of woody vegetation to groundwater limitation, our study establishes the basis for predicting the physiological responses of woody vegetation in semi-arid coastal ecosystems to groundwater drawdown. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110230
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Centre for Ecology Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal; PPG – Ecologia, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, Brazil; Department of Ecosystem Science and Management, Texas A&M University, College Station, TX, United States; Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Sevilla, Spain; Núcleo de Estudos e Pesquisas Ambientais, Universidade Estadual de Campinas, Campinas, Brazil
Recommended Citation:
Antunes C.,Chozas S.,West J.,et al. Groundwater drawdown drives ecophysiological adjustments of woody vegetation in a semi-arid coastal ecosystem[J]. Global Change Biology,2018-01-01,24(10)