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Increased water use in dry season in eight dipterocarp species in a common plantation in the northern boundary of Asian tropics
Siddiq, Zafar; Cao, Kun-Fang
2016
Source PublicationECOHYDROLOGY
Volume9Issue:5Pages:871-881
AbstractThe 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.
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10166
Collection植物生理生态研究组
Recommended Citation
GB/T 7714
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.
APA Siddiq, Zafar,&Cao, Kun-Fang.(2016).Increased water use in dry season in eight dipterocarp species in a common plantation in the northern boundary of Asian tropics.ECOHYDROLOGY,9(5),871-881.
MLA Siddiq, Zafar,et al."Increased water use in dry season in eight dipterocarp species in a common plantation in the northern boundary of Asian tropics".ECOHYDROLOGY 9.5(2016):871-881.
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