Relating leaf area index of natural eucalypt vegetation to climate variables in southern Australia
2008
Ellis, T.W. | Hatton, T.J.
We address a need for a rapid technique to estimate the leaf area index (LAI) of pre-existing natural vegetation. This is required to determine the effects of agroforestry plantings on deep drainage from agricultural land. Previous work shows: (1) a relationship between the hydrologic 'footprint' of tree belts and their lineal leaf area (leaf area per metre of belt, LLA, m² m⁻¹), relative to the LAI of natural vegetation and (2) that the LAI of natural vegetation is related to plant-available soil moisture and climate. We evaluated relationships between LAI measured at 37 sites across southern Australia and (1) annual average rainfall, P; (2) annual average pan evaporation, E ₀; (3) 'available rainfall'--annual average rainfall, P, minus annual average pan evaporation, E ₀; (4) a climate wetness index P/E ₀; (5) Specht's soil evaporative index, k =0.0045+71.57/E ₀. P was the best indicator for the data set used, i.e. LAI=0.003P +0.41 (r ² =0.80).
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