期刊
AUSTRALIAN GEOGRAPHER
卷 41, 期 3, 页码 391-401出版社
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
DOI: 10.1080/00049182.2010.498042
关键词
Drought severity; inland New South Wales; landholder observations; rainfall; run-off lands; tree deaths
类别
Tree deaths over large areas during droughts are uncommon. In the semi-arid zone of New South Wales (NSW) such events were last reported during the prolonged droughts of 1895-1903 and 1939-45, though whether caused solely by drought is open to question. Anecdotal and quantitative evidence during the current prolonged drought (2001-?) in NSW's sub-humid zone (where deaths are localised) and semi-arid zone (where deaths are more extensive) suggest that climatic conditions are comparable to, and perhaps more severe than, those of the earlier prolonged droughts. It is suggested that lack of access to deep soil moisture due to inherent shallow rooting, or due to site conditions, is the most likely cause; and that this may be associated with higher than optimal tree densities in cohorts of trees that arose from previous regeneration events during periods of well above average rainfall. A more thorough examination of the extent and severity of this event is warranted.
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