水分胁迫对3个枣品种光合特性及水分利用率的影响 |
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引用本文: | 马艳丽,朱虹,王鹏. 水分胁迫对3个枣品种光合特性及水分利用率的影响[J]. 防护林科技, 2016, 0(8): 38-42. DOI: 10.13601/j.issn.1005-5215.2016.08.014 |
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作者姓名: | 马艳丽 朱虹 王鹏 |
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作者单位: | 辽宁省干旱地区造林研究所,辽宁 朝阳,122000 |
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摘 要: | 对朝阳地区常见的3个品种枣苗(大平顶枣、金铃圆枣、三星大枣)2年生嫁接苗进行4个不同的土壤控水处理,测定出3个品种枣苗在不同水分胁迫条件下的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间CO2浓度(Ci)等光合特性指标,并计算水分利用效率,以探讨水分胁迫对3个枣品种光合特性及水分利用率的影响,结果表明:土壤水分的变化与净光合速率和气孔导度的变化呈正比关系;在重度胁迫条件下,随着胁迫时间的增加,3个枣品种胞间CO2浓度值接近直线上升状态;随干旱胁迫强度加大,蒸腾速率呈下降趋势。三个枣品种抗旱性大小顺序为三星大枣金铃圆枣大平顶枣。
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关 键 词: | 水分胁迫 枣 光合特性 水分利用率 |
Effects of Water Stress on Photosynthetic Characteristics and Water Use Efficiency of Three Varieties of Ziziphus jujuba |
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Abstract: | Two-year-old Zizyphus jujuba ‘Dapingding’,Zizyphus jujuba ‘Jinlingyuan’and Zizyphus jujube‘Sanxingda’in Chaoyang Region were conducted water-controlled treatment.Photosynthetic rate under (Pn),tran-spiration rate (Tr),stomatal conductance (Gs),intercellular CO2 concentration (Ci)of three varieties were meas-ured under different water stress conditions.Water use efficiency was calculated.Effects of water stress on photo-synthetic characteristics and water use efficiency of three j uj ube varieties were discussed.Result shows that:changes of soil moisture with net photosynthetic rate and stomatal conductance appear direct proportional relationship;under severe stress,intercellular CO2 concentration values among three jujube varieties are close to straight up state with the increase of stress time ;as drought stress intensity increased,transpiration rate decreased.The descending or-der of drought resistance for three varieties of Zizyphusjujuba is Zizyphusjujube ‘Sanxingda’>Zizyphusjujuba‘Jinlingyuan’> Zizyphus jujuba ‘Dapingding’. |
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Keywords: | water stress Zizyphus jujuba photosynthetic characteristics water use efficiency |
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