期刊
ECOLOGICAL ENGINEERING
卷 36, 期 9, 页码 1191-1200出版社
ELSEVIER
DOI: 10.1016/j.ecoleng.2009.11.029
关键词
Phreatophyte; Vegetation; Groundwater management; Climate change; Drawdown; Monitoring
The influence of climatic drought and groundwater abstraction on phreatophytic vegetation dynamics was investigated in the southwest of Western Australia. Two contrasting examples of long-term phreatophytic plant community response to reduced water availability are presented. Multivariate analysis of vegetation and hydrological parameters determined depth to watertable as the dominant biophysical driver of floristic spatial and temporal patterns. Under lower rates of watertable drawdown (9 cm year(-1)), a progressive change in floristic composition was observed over a 33-year period. The abundance of species with a preference for wetter sites was significantly reduced, whereas that of more drought-tolerant species increased. Higher rates of drawdown (50 cm year-1) where groundwater abstraction exacerbated climatic drought resulted in a threshold response in vegetation and 33% dissimilarity to pre-abstraction floristics in 12 years. In the context of an ecohydrological state and transition conceptual model, it is suggested higher rates of groundwater drawdown result in a threshold breach and subsequent transition to an alternative ecohydrological state, whilst lower rates result in a progressive floristic transition. (C) 2009 Elsevier B.V. All rights reserved.
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