Winter Klaus, Aranda Jorge, Holtum Joseph A M
Smithsonian Tropical Research Institute, P.O. Box 2072, Balboa, Ancón, Republic of Panama.
Funct Plant Biol. 2005 Jul;32(5):381-388. doi: 10.1071/FP04123.
The relationship between water-use efficiency, measured as the transpiration ratio (g HO transpired g above- plus below-ground dry mass accumulated), and C / C ratio (expressed as δC value) of bulk biomass carbon was compared in 15 plant species growing under tropical conditions at two field sites in the Republic of Panama. The species included five constitutive crassulacean acid metabolism (CAM) species [Aloe vera (L.) Webb & Berth., Ananas comosus (L.) Merr., Euphorbia tirucalli L., Kalanchoë daigremontiana Hamet et Perr., Kalanchoë pinnata (Lam.) Pers.], two species of tropical C trees (Tectona grandis Linn. f. and Swietenia macrophylla King), one C species (Zea mays L.), and seven arborescent species of the neotropical genus Clusia, of which two exhibited pronounced CAM. The transpiration ratios of the C and CAM species, which ranged between 496 g HO g dry mass in the C-CAM species Clusia pratensis Seeman to 54 g HO g dry mass in the constitutive CAM species Aloe vera, correlated strongly with δC values and nocturnal CO gain suggesting that δC value can be used to estimate both water-use efficiency and the proportion of CO gained by CAM species during the light and the dark integrated over the lifetime of the tissues.
在巴拿马共和国两个野外地点的热带条件下生长的15种植物中，比较了以蒸腾比率（每积累克地上和地下干物质所蒸腾的克水）衡量的水分利用效率与整株生物量碳的C / C比率（以δC值表示）之间的关系。这些物种包括5种组成型景天酸代谢（CAM）物种[库拉索芦荟（Aloe vera (L.) Webb & Berth.）、菠萝（Ananas comosus (L.) Merr.）、绿玉树（Euphorbia tirucalli L.）、落地生根（Kalanchoë daigremontiana Hamet et Perr.）、羽叶落地生根（Kalanchoë pinnata (Lam.) Pers.）]、2种热带C树木（柚木（Tectona grandis Linn. f.）和大叶桃花心木（Swietenia macrophylla King））、1种C4物种（玉米（Zea mays L.））以及新热带属Clusia的7种乔木物种，其中2种表现出明显的CAM特征。C4和CAM物种的蒸腾比率在C4 - CAM物种普拉滕西亚克鲁西亚木（Clusia pratensis Seeman）的每克干物质蒸腾496克水至组成型CAM物种库拉索芦荟的每克干物质蒸腾54克水之间，与δC值和夜间CO2吸收密切相关，这表明δC值可用于估计水分利用效率以及CAM物种在组织整个生命周期内光期和暗期积累的CO2比例。
