Water Use Efficiency of Eucalyptus camaldulensis Growing in Arid Regions in Western Australia

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Kiyotaka Tahara³  Nobuhide Takahashi³  Yasuyuki Egashira⁶  Hajime Utsugi²  Koichi Yamada⁵  Yukuo Abe⁴  Masahiro Saito²  Toshinori Kojima¹ 

[1] Department of Applied Chemistry, Seikei University;Forestry and Forest Products Research Institute;Japan Science and Technology Corporation;Institute of Agricultural and Forest Engineering, University of Tsukuba;Department of Fine Materials Engineering, Shinshu University;Department of Chemical Science and Engineering, Osaka University

关键词: Water Use Efficiency;    Eucalyptus camaldulensis;    Sap Flow;    Soil Water Content;    Western Australia;    Carbon Fixation;   

DOI  :  10.1252/jcej.36.391

来源: Maruzen Company Ltd

【 摘 要 】

References(14)Cited-By(7)A carbon fixation system by large-scale afforestation in arid regions is being researched near Leonora in Western Australia. A tree species that naturally grows in the area, E. camaldulensis, has been planted at the afforestation trial sites. In arid regions, water use efficiency by a tree, defined as the ratio of its organic dry matter production to its water consumption, is an important factor in tree growth for establishing a strategy for afforestation. In this study, the soil water content conditions under which E. camaldulensis could grow in arid regions were investigated and the water use efficiency, daily sap density flux, transpiration rate, and photosynthetic rates were measured. The results show that a thick soil layer (>2 m) effectively collected runoff water and could maintain the growth of E. camaldulensis. The daily sap flux density of the tree was closely related to the water content of the soil between 0.5 m and 1.0 m in depth. The water use efficiency of productivity, WUEP [g-dry mass increase/kg-water consumption] depended on the season, and the average WUEP over a 1-year period was about 5. The maximum WUEP occurred during the period of minimum soil water content, and decreased with its increase. These results were confirmed by measurements of transpiration and photosynthetic rates.

【 授权许可】

Unknown