from Part V - Cloud forest water use, photosynthesis, and effects of forest conversion
Published online by Cambridge University Press: 03 May 2011
ABSTRACT
This chapter presents a comparison of the water budgets of a lower and an upper montane cloud forest in Australia's Wet Tropics region based on field measurements of rainfall, throughfall (TF), stemflow (SF), transpiration, and cloud water interception (CWI). The proportions of total precipitation measured as TF and SF varied between the two sites. At the lower montane cloud forest site (Upper Barron), SF was 7% while TF was just 64%. The upper montane cloud forest site (Bellenden Ker) showed higher SF at 10% while TF was also high at 83%. CWI at the two sites was quantified using a wet-canopy water balance methodology and was found to contribute up to 65% of the monthly water input during dry season months. At Upper Barron, CWI was 19% of average annual precipitation while at Bellenden Ker it was as much as 29%. These measurements resulted in an overall canopy interception evaporation loss of 29% at Upper Barron and just 7% at Bellenden Ker. About 20% of total precipitation was lost through transpiration at Upper Barron and just 5% at Bellenden Ker. Transpiration losses were less than water losses through wet-canopy evaporation at both sites. Both sites have a large annual net surplus of water to sustain streamflow and groundwater recharge. Total evaporation losses at Upper Barron accounted for about 50% of total precipitation input, leaving 50% for runoff and groundwater recharge. […]
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