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作者

来源

URBAN FORESTRY & URBAN GREENING,Vol.38,P.157-164

语言

英文

关键字

Landfill restoration; Maximum quantum yield; Species selection; Transpiration; Urban trees; STOMATAL CONDUCTANCE; CHLOROPHYLL FLUORESCENCE; LEAF TRAITS; TRANSPIRATION; PERFORMANCE; PHOTOSYNTHESIS; RESTORATION; VEGETATION; DENSITY; QUALITY

作者单位

[Hui, L. C.; Chu, L. M.] Chinese Univ Hong Kong, Sch Life Sci, Shatin, Hong Kong, Peoples R China. Chu, LM (reprint author), Chinese Univ Hong Kong, Shatin, 603A,Mong Man Wai Bldg, Hong Kong, Peoples R China. E-Mail: 1009615701@link.cuhk.edu.hk; leemanchu@cuhk.edu.hk

摘要

Post-closure landfills are usually managed for restoration and revegetation. To minimize percolation and the negative environmental effects of landfill-associated factors, evapotranspiration (ET) covers are becoming more widely used on landfills to allow the establishment of a functional plant-soil system. The applicability of ET covers in humid regions can be enhanced by using plant species with high transpiration rates. This is determined using plant traits that are useful indicators for screening species with high transpiration rates. In this study, the transpiration rates of seedlings of six common tree species in Hong Kong were measured using a gravimetric method. Acacia confusa, the only exotic species, showed the best performance in terms of both growth and transpiration potential at tree-level transpiration (60.4-93.7 g/day) and leaf-level transpiration (0.080-0.172 g/day/cm(2)) among the six species studied. Whole-seedling transpiration was found to be highly dependent on the size of tree seedlings, whereas a high growth rate and small leaves were possible indicators of a high transpiration rate per unit leaf area. We suggest that the growth rate and maximum quantum yield are good criteria for the selection of species to be planted on ET covers. The possibility of using suitable exotic species as pioneer species on ET covers is also discussed.