田间玉米在水分胁迫下的水分利用效率。
Water Use Efficiency of Field-grown Maize during Moisture Stress.
机构信息
Microclimate Project, United States Department of Agriculture, Agricultural Research Service Northeastern Region, Cornell University, Ithaca, New York 14853.
出版信息
Plant Physiol. 1975 Aug;56(2):245-9. doi: 10.1104/pp.56.2.245.
Theoretical analysis of the CO(2) assimilation and water loss by single leaves suggests that the water use efficiency of C(4) species decreases as stomatal resistance increases. To confirm this hypothesis for a complete maize crop, results from computer simulations and a field experiment were compiled for varying stomatal resistances. A soil-plant-atmosphere model allowed simulations of the many simultaneous interactions between a crop canopy and its environment. The simulations for varying stomatal resistances clearly indicated that as stomatal resistance increased, water use efficiency of the maize crop decreased. The field experiment data also confirmed that water use efficiency was significantly decreased under water stress conditions when stomatal resistance increased. We concluded that management practices for maize, which induce moisture stress conditions resulting in increased stomatal resistance, reduce both crop photosynthetic productivity and water use efficiency.
对单叶的二氧化碳同化和水分损失的理论分析表明，随着气孔阻力的增加，C4 物种的水分利用效率降低。为了证实这一假说在完整的玉米作物中的适用性，对不同气孔阻力下的计算机模拟和田间试验结果进行了编译。土壤-植物-大气模型允许模拟作物冠层及其环境之间的许多同时相互作用。不同气孔阻力的模拟清楚地表明，随着气孔阻力的增加，玉米作物的水分利用效率降低。田间试验数据也证实，当气孔阻力增加时，水分胁迫条件下的水分利用效率显著降低。我们的结论是，导致水分胁迫条件下气孔阻力增加从而减少作物光合生产力和水分利用效率的玉米管理措施。
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