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title: Increased water use in dry season in eight dipterocarp species in a common plantation in the northern boundary of Asian tropics
author: Siddiq, Zafar;  Cao, Kun-Fang
Issued Date: 2016
Abstract: The seasonal water use and stand-level transpiration of the important tropical timber tree family, Dipterocarpaceae, have not been well investigated. Here, we characterized the seasonal water use and stand-level transpiration of eight, evergreen, dipterocarps in tropical Southwest China in the 2013 wet and dry seasons: six species grown in monoculture and two species in mixture. We estimated stand-level transpiration using a power model, combining data from 22 trees of all species measured in the two seasons. Despite significant decreases in soil volumetric water content within 1-m depth, predawn leaf water potentials (> -0.5 MPa) of all trees indicated access of roots to water. Daily sap flux density (SFDd) of all species closely responded to vapour pressure deficit (VPD). Dry season VPD increased by 29%, compared to in wet season, resulting 27-52% increased SFDd in six of the eight species. Whole tree daily water use was scaled with diameter at 1.3m height for the 22 trees (r(2) = 0.91 and 0.93 in the wet and dry seasons, respectively). Daily mean stand-level transpiration ranged from 0.63 to 2.23mm d(-1) (mean = 1.05) and from 1.18 to 2.29 mm d(-1) (mean = 1.63) in the wet and dry seasons, respectively. Our results reveal conservative water use of dipterocarps and increased transpiration in dry season when a stable soil water source is available. In comparison with introduced fast-growing timber species, such as Eucalyptus and Acacia mangium, dipterocarp trees and forests consume much less water, making them more suitable as plantation timber crops for the region.
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Recommended Citation:
Siddiq, Zafar,Cao, Kun-Fang. Increased Water Use In Dry Season In Eight Dipterocarp Species In A Common Plantation In The Northern Boundary Of Asian Tropics[J]. Ecohydrology,2016,9(5):871-881.

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