| 干旱过程中苹果茎水势和叶水势的变化研究 |
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| 引用本文： | 冉辛拓,郝宝锋,张新生. 干旱过程中苹果茎水势和叶水势的变化研究[J]. 河北农业科学, 2009, 13(4): 16-17 |
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| 作者姓名： | 冉辛拓 郝宝锋 张新生 |
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| 作者单位： | 河北省农林科学院昌黎果树研究所,河北,昌黎,066600;河北省农林科学院昌黎果树研究所,河北,昌黎,066600;河北省农林科学院昌黎果树研究所,河北,昌黎,066600 |
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| 基金项目： | 现代农业产业(苹果)技术体系专项经费资助(MATS)项目 |
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| 摘 要： | 分别于8：00和15：00,对田间生长的4 a生苹果树在充分灌水后的22 d干旱周期内的茎水势和叶水势进行跟踪测定,同时测定了土壤充分湿润、中度水分亏缺及严重水分亏缺条件下上述指标的日变化。结果表明：在3种土壤水分条件下叶水势的变化幅度在0.2MPa左右,差异不明显 而午间茎水势则由土壤充分湿润时的-0.6MPa降至土壤水分严重亏缺时的-1.8MPa,下降了1.2MPa。在整个干旱周期中,午间茎水势的变化虽受日蒸发量的影响,但其变化趋势与土壤水势的变化趋势较一致。随着干旱的加重,午间茎水势与叶水势之差,即茎、叶水势梯度也出现极大变化。在土壤充分湿润时,茎、叶水势梯度高达1.5MPa 在土壤水分严重亏缺条件下,差异缩小为0MPa。研究认为苹果外围新梢水势及茎水势与叶水势梯度的变化对土壤水分亏缺的反应比叶水势的变化更敏感,因此较适宜作为衡量果树水分亏缺程度的生理指标。
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| 关 键 词： | 苹果 茎水势 叶水势 水分亏缺 |
Changes of Leaf and Stem Water Potential of Apple under Soil Drought Stress |
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| RAN Xin-tuo,HAO Bao-feng,ZHANG Xin-sheng. Changes of Leaf and Stem Water Potential of Apple under Soil Drought Stress[J]. Journal of Hebei Agricultural Sciences, 2009, 13(4): 16-17 |
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| Authors: | RAN Xin-tuo HAO Bao-feng ZHANG Xin-sheng |
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| Affiliation: | Changli Institute of Pomology;Hebei Academy of Agriculture and Forestry Sciences;Changli 066600;China |
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| Abstract: | In the 22-day drought period after sufficient irrigation,the leaf and stem water potential of four years apple trees were determined at 8:00 and 15:00,respectively,and the diurnal variation of the leaf and stem water potential under well irrigation,medium water deficiency and sever drought stress were measured.The results showed that the change range of leaf water potential was 0.2 MPa,and there had not significant difference under three soil water conditions.The stem water potential at 15:00 was-0.6 MPa un... |
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| Keywords: | Apple Stem water potential Leaf water potential Water stress |
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