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首页> 外文期刊>The Journal of Horticultural Science & Biotechnology >Leaf gas exchange of green dwarf coconut (Cocos nucifera L. var. nana) in two contrasting environments of the Brazilian north-east region
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Leaf gas exchange of green dwarf coconut (Cocos nucifera L. var. nana) in two contrasting environments of the Brazilian north-east region

机译：在巴西东北部地区的两个对比环境中，绿矮椰子（Cocos nucifera L. var。nana）的叶片气体交换

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摘要

Leaf gas exchange characteristics of green dwarf coconut were studied in 2000 in two contrasting environments highlighting the technical aspects of construction of light-response curves in field conditions and its mathematical approach. Site I is atthe south-east region of Bahia State in a hot and humid climate area. The contrasting Site II is located at the Pernambuco State in a semi-arid type of climate. Measurements of leaf gas exchange were accomplished using a portable photosynthesis system equipped with an artificial light source. Significant differences were observed between the two sites for the leaf-to-air water vapour pressure deficit and light-saturated (Qi _800 #mu#mol m-2 s-1) net photosynthesis and stomatal conductance. Mean values ofthese variables, in that order, were 1.4 and 2.1 kPa, 12.7 and 8.3 #mu#mol CO2 m-2 s-1 and 0.36 and 0.13 mol H2O m-2 s-1 at Sites I and II, respectively. Eight mathematical models relating both net photosynthesis and stomatal conductance with photosynthetically active radiation, were adjusted from the field data. Good results were obtained with the models, mainly when a linear function of leaf-to-air water vapour pressure deficit was included, indicating that the green dwarf coconut stomata show a strong dependence on water vapour pressure deficit.
机译：2000年，在两个对比的环境中研究了绿矮椰子的叶片气体交换特性，突出了田间条件下光响应曲线构建的技术方面及其数学方法。网站I位于巴伊亚州的东南部地区，气候炎热潮湿。形成鲜明对比的Site II位于伯南布哥州，属于半干旱气候。使用配备有人工光源的便携式光合作用系统完成叶片气体交换的测量。观察到两个位置之间的叶对空气水蒸气压亏缺和光饱和（Qi _800＃mu＃mol m-2 s-1）净光合作用和气孔导度存在显着差异。这些变量的平均值按此顺序分别在站点I和站点II分别为1.4和2.1 kPa，12.7和8.3＃mu＃mol CO2 m-2 s-1和0.36和0.13 mol H2O m-2 s-1。从实地数据调整了八个与净光合作用和气孔电导与光合有效辐射相关的数学模型。使用该模型获得了良好的结果，主要是在包括叶对空气水蒸气压亏缺的线性函数的情况下，这表明绿色矮椰子气孔显示出对水蒸气压亏缺的强烈依赖性。

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