Water Consumption ofEucalyptus urophy lla P lantations on the Leizhou Peninsula

ZHANG Ning-nan; XU Da-ping; JIM Morris; ZHOU Guang-yi; BAI Jia-yu; ZHOU Tao

T ree grow th, w ater consumption, clima te factors, availab lew ater in so il pro file as deep as 4 meters w eremon ito red for 1 year in 4-year-o ld Eucalyp tus urophy lla trees grow n in contrasting so il types at the Le izhou pen insula, southeastern China. The present experimental resu lts indica ted that the sapw ood area in Eucalyp tus urophyllatrees w as close ly re lated to d iameter at breast height ( DBH ) and itw as possible to use the sapw ood area in scalingup estimat ion o fw ater consumption from an ind iv idual tree to stand leve.l Themean daily sap flow density ( SFD) inHetou and Jijia, the study sites, w ere respective ly 2 772、1 839 L m-2 d-1; mean da ily w ater use w ere 1. 49、1??53mmd -1. Annualw ater use ofHetou and Jijia p lantations were 542 and 559mm, respective ly; wh ich w ereequ iva lent to 35% and 36% of annua l ra infal.l Low w ater use may have resulted from comb ined e ffects o f severalfacto rs, including open canopy and low leaf area index, soilw ater decline in the dry season, and low vapor pressuredef ic i,t which limited w ater consumption o f the trees.

1. Research Inst itute of Trop ical Fores try, CAF, Guangzhou?? 510520, Guangdong, China

2. Fores t Science Cen tre, Heidelberg, V ictoria, Austra lia?? 3084

Received Date: 2006-04-25

Abstract: T ree grow th, w ater consumption, clima te factors, availab lew ater in so il pro file as deep as 4 meters w eremon ito red for 1 year in 4-year-o ld Eucalyp tus urophy lla trees grow n in contrasting so il types at the Le izhou pen insula, southeastern China. The present experimental resu lts indica ted that the sapw ood area in Eucalyp tus urophyllatrees w as close ly re lated to d iameter at breast height ( DBH ) and itw as possible to use the sapw ood area in scalingup estimat ion o fw ater consumption from an ind iv idual tree to stand leve.l Themean daily sap flow density ( SFD) inHetou and Jijia, the study sites, w ere respective ly 2 772、1 839 L m-2 d-1; mean da ily w ater use w ere 1. 49、1??53mmd -1. Annualw ater use ofHetou and Jijia p lantations were 542 and 559mm, respective ly; wh ich w ereequ iva lent to 35% and 36% of annua l ra infal.l Low w ater use may have resulted from comb ined e ffects o f severalfacto rs, including open canopy and low leaf area index, soilw ater decline in the dry season, and low vapor pressuredef ic i,t which limited w ater consumption o f the trees.

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Water Consumption ofEucalyptus urophy lla P lantations on the Leizhou Peninsula

Abstract

References

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