摘要
依据田间试验和生长箱内的模拟试验资料，分析了冬小麦和玉米叶水势与蒸腾速率在不同有效土壤水势下的相互关系，结果发现，在一定的有效土壤水势范围内，叶水势与蒸腾速率间存在滞后现象，而且滞后效应随有效土壤水势的降低而减弱，当有效土壤水势降低到一定的值时，叶水势与蒸腾速率间呈非线性关系，最后借助于瞬态流方程探讨了这一现象形成的原因。
Based on the experimental data obtained from winter wheat and corn in field and growth room, the relation between leaf water potential(LWP) and transpiration rate (Tr) under various effective soil water potential (ψB) is analysed in this paper. The results indicate that an hysteresis between LWP and Tr is existed when -3.321 bar<ψB.≤-0.631 bar for winter wheat, when -4.319 bar <ψB≤-0.867 bar for corn. The hysteresis effect decreases with decrease of the effective soil water potential and approaches a non-liner reation at lower ψB. The cause of the hysteresis effect is also studied with the aid of the non-linear model.
出处
《水利学报》
EI
CSCD
北大核心
1996年第3期1-6,共6页
Journal of Hydraulic Engineering
关键词
土壤
蒸腾速率
滞后效应
水容
水流阻力
effective soil water potential
hydraulic resistance
hydraulic capacitance hysteresis effect
leaf water potential
transpiration rate
