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首页> 外文期刊>Journal of Agronomy and Crop Science/Zeitschrift fur acker-und pflanzenbau >Leaf gas exchange characteristics of jatropha as affected by nitrogen supply, leaf age and atmospheric vapour pressure deficit.
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Leaf gas exchange characteristics of jatropha as affected by nitrogen supply, leaf age and atmospheric vapour pressure deficit.

机译：麻疯树的叶片气体交换特性受氮供应，叶片年龄和大气蒸气压亏缺的影响。

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Facing a steadily increasing world energy demand, jatropha, among other energy crops, has been reported to potentially contribute to biofuel production. A basic characterisation of plant responses to abiotic environmental factors is important for assessing the model-assisted potential of this plant in view of the many agro-ecological zones in which jatropha is presently cultivated. Two pot experiments and two field studies were used to record gas exchange parameters in response to light, nitrogen supply, atmospheric vapour pressure deficit (VPD), leaf age and time of measurements. Variation of N supply from 0 to 16 mM resulted in lower rates of photosynthesis (A) and stomatal conductance (gs) of treatment 0 mM N compared with other N levels, whereas the light compensation point (IC), quantum yield (QY) and dark respiration rates (Rd) were similar in all treatments. In the field, diurnal effects were evident with higher light-saturated photosynthetic rate (Amax) and QY and lower IC and Rd in the morning than in the afternoon. Considering leaf age effects, fully expanded leaves had a lower Amax compared with expanding leaves and this variation in leaf gas exchange was not related to changes in the chlorophyll index value (SPAD) which steadily increased with leaf age. QY of field and greenhouse plants varied from 0.023 to 0.037 and was substantially lower than in C3 plants. A was positively correlated with gs in a hyperbolic function. A varied from 0.64 to 21.13 micro mol m-2 s-1 and gs varied from 12 to 469 mmol m-2 s-1. With increasing VPD, gs decreased, but this response differed between the field experiments and the two pot experiments which contrasted each other distinctively. Applying the inverse logistic function of Webb (Ecological Modeling, 56 (1991), 81), the maximal stomatal conductance of jatropha was in the range of 382 mmol m-2 s-1 and gs is predicted to be close to zero at 5 kPa. These data altogether indicate that light absorption characteristics of single leaves and carbohydrate status parameters should be investigated further to explain the low QY and the pronounced diurnal variation.
机译：面对世界能源需求的稳定增长，据报道，麻疯树以及其他能源作物可能对生物燃料的生产做出贡献。鉴于目前种植麻风树的许多农业生态区，植物对非生物环境因素的反应的基本表征对于评估该植物的模型辅助潜力很重要。使用两个盆实验和两个田间研究来记录响应光，氮供应，大气蒸气压亏缺（VPD），叶片年龄和测量时间的气体交换参数。氮供应量从0到16 mM的变化导致与其他N水平相比，处理0 mM N的光合作用（A）和气孔导度（g s ）的速率降低，而光补偿点（I在所有处理中， C ），量子产率（QY）和暗呼吸速率（R d ）相似。在田间，光饱和光合速率（A max ）和QY较高，而I C 和R d 较低时，昼夜效应明显早上比下午好。考虑到叶龄的影响，完全膨胀的叶片与膨胀叶片相比具有较低的A max ，并且叶片气体交换的这种变化与叶绿素指数值（SPAD）的变化无关，后者随叶龄的增加而稳定增加。田间和温室植物的QY从0.023到0.037不等，大大低于C3植物。 A在双曲函数中与g s 正相关。 m -2 s -1 在0.64至21.13 micro mol之间，而g s 在12至469 mmol m -2之间变化 s -1 。随着VPD的增加，g s 降低，但是这种响应在田间试验和两个盆栽试验之间有所不同，两者之间存在明显的差异。应用韦伯逆逻辑函数（Ecological Modeling，56（1991），81），麻风树的最大气孔导度在382 mmol m -2 s -1 和g s 预计在5 kPa时接近零。这些数据表明，应进一步研究单叶的光吸收特性和碳水化合物状态参数，以解释低QY和明显的昼夜变化。

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