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冬小麦叶水势-蒸腾速率关系的滞后效应
Authors
邵明安
黄明斌
Publication date
1 January 1995
Publisher
Abstract
<正>植物叶水势和蒸腾速率是判断和预测植物水分亏缺的2个常用生理指标.在稳态水流条件下,对其关系的研究人们已做过大量的工作,普遍接受的结论有二:一为线性关系,即系统内的水流阻力为一常数;二为非线性关系,即系统内的水流通量较小时,有较高的水流阻力,而当水流通量逐渐增大时,水流阻力趋于定值.然而,系统内的水流通量除受控于势梯度和水流阻力外,还受系统内的水容影响,是瞬态流而非稳态流.因此,在瞬态水流条件下研究植物叶水势与蒸腾速率的关系就更具有实用价值.为此,本文以冬小麦田间试验和生长箱内的模型试验为基础探讨了这一关系.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效应,并借助于非线性网络模型,对其形成的原因进行了分析
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018