Mortality of developing floodplain forests subjected to a drying climate and water extraction

Gillis Horner, Patrick Baker, Ralph MAC NALLY, Shaun Cunningham, Jim THOMSON, Fiona Hamilton

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

River regulation and water extraction have altered the hydrology of rivers resulting in substantial changes to forest structure and the dieback of floodplain forests globally. Forest mortality, due to water extraction, is likely to be exacerbated by climate changeinduced droughts. In 1965, a plantation trial was established within a natural floodplain forest to examine the effect of planting density on timber production. We used data from this trial to investigate the effect of initial stand density on the structure and dynamics of Eucalyptus camaldulensis (Dehnh.) forests. Highest density stands (8000 trees ha -1) were dominated by many slender trees, mostlyo10cm in diameter, whereas the lowest density stands produced size distributions with a wider range of stem diameters and higher mean and maximum stem diameter. After 1996, the study area experienced a sharp decline in water availability due to a substantial lowering of the water table, reduced flooding frequency, a pronounced rainfall deficit and increased maximum temperatures. The drought coincided with a dramatic increase in mortality in the high-density stands, yet remained little changed in low-density treatments. Our results highlight the importance of initial stand density as a key determinant of the development of forest structure. Early thinning of high-density stands is one component of a broader management approach to mitigate impacts of human-induced drought and water extraction on developing floodplain forests.
Original languageEnglish
Pages (from-to)2176-2186
Number of pages11
JournalGlobal Change Biology
Volume15
DOIs
Publication statusPublished - 2009
Externally publishedYes

Fingerprint

floodplain forest
Drying
Drought
mortality
Water
climate
Rivers
drought
Hydrology
Timber
stem
Rain
dieback
forestry production
drying
water extraction
Availability
river
water availability
thinning

Cite this

Horner, Gillis ; Baker, Patrick ; MAC NALLY, Ralph ; Cunningham, Shaun ; THOMSON, Jim ; Hamilton, Fiona. / Mortality of developing floodplain forests subjected to a drying climate and water extraction. In: Global Change Biology. 2009 ; Vol. 15. pp. 2176-2186.
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Mortality of developing floodplain forests subjected to a drying climate and water extraction. / Horner, Gillis; Baker, Patrick; MAC NALLY, Ralph; Cunningham, Shaun; THOMSON, Jim; Hamilton, Fiona.

In: Global Change Biology, Vol. 15, 2009, p. 2176-2186.

Research output: Contribution to journalArticle

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T1 - Mortality of developing floodplain forests subjected to a drying climate and water extraction

AU - Horner, Gillis

AU - Baker, Patrick

AU - MAC NALLY, Ralph

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AU - THOMSON, Jim

AU - Hamilton, Fiona

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KW - climate change

KW - drought

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