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- W2364477976 abstract "Plant canopies are dramatically affected by leaves as sunlit fraction receiving direct light and shaded fraction only receiving diffuse light or being shaded and by variation of light,temperature and water vapor deficit in a day.When scaling up from leaves to canopy there are additional complications that affect the measurement of water use efficiency(WUE).The carbon isotope ratio of leaves(δ13Cp) was seasonally measured,and the integrated canopy-level carbon isotope discrimination(⊿canopy) and the ratio of isotope of newly fixed carbon(δ13Cplant) were estimated for calculating the canopy WUE in an A.mangium plantation in the hilly land of Heshan in South China.A general increase was found in the maximum air temperature(Tamax),atmosphere saturation deficit(Dmax) and leaf water potential(Ψ,MPa) from winter to summer on the site.The results showed the highest δ13Cplant values occurred in the morning and at the dusk in winter,while the lowest generally appeared at the dusk in spring and summer.No obvious variation of δ13Cplant occurred in autumn.A higher δ13Cplant and a lower ⊿canopy occurred in winter compared with those in other seasons.An increasing δ13Cplant trend and a decreasing ⊿canopy one from spring to autumn were observed.The average(±SD) WUE [(2.01±0.38) mmol mol-1] of the canopy of A.mangium occurred in summer,and it was much lower than that observed in winter and spring [(6.90±0.26) and(5.65±0.14) mmol mol-1]).The difference in canopy WUE in different seasons at this site was primarily due to environment conditions,which would cause the change in integrated ratio of intercellular to ambient CO2 concentration and be consistent with the changes in ⊿canopy and δ13Cplant.There was a strong negative correlation of WUE with air temperature and water vapour pressure defi cit(D,kPa),as well as with leaf water potential(Ψ,MPa).An fair agreement between WUE measured using δ13Cplant and that using Ball Woodrow-Berry model following Wang and Leuning(1998) was observed.This result indicated that the stable isotope composition of newly-fi xed carbon was a useful canopy-scale tool that would help to study the constrain of environmental stress on canopy WUE ." @default.
- W2364477976 created "2016-06-24" @default.
- W2364477976 creator A5018193814 @default.
- W2364477976 date "2010-01-01" @default.
- W2364477976 modified "2023-09-23" @default.
- W2364477976 title "Climatic Control of Water Use Efficiency of Acacia mangium Forest Canopy" @default.
- W2364477976 hasPublicationYear "2010" @default.
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