| 邹 杰，李 春，刘卫国，等.不同地下水位多枝柽柳幼苗光合作用及抗逆性变化[J].广东农业科学,2015,42(9):32-39 |
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不同地下水位多枝柽柳幼苗光合作用及抗逆性变化 |
| Photosynthetic and stress tolerance change of Tamarixramosissima seedling under different water tables |
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| DOI： |
| 中文关键词: 地下水位 多枝柽柳幼苗 光合作用 抗逆性 |
| 英文关键词: water table Tamarix ramosissima seedling photosynthesis stress tolerance |
| 基金项目: |
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| 摘要点击次数: 1607 |
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| 中文摘要: |
| ：以多枝柽柳幼苗为研究对象，设置4 个不同地下水位（U1、U2、U3 和U4，分别距离地面为1、2、3、
4 m），研究不同地下水位处理对多枝柽柳幼苗光合作用和抗逆性的影响。结果表明：随着地下水位的下降，多枝
柽柳幼苗的表观量子效率、暗呼吸速率、羧化效率、光呼吸速率、最大净光合速率均下降，且对有效光合辐射和
CO2 浓度的利用范围减小，U1 最大净光合速率为25.24（±4.95）μmol/m2·s，U4 最大净光合速率下降了88.99%，
下降到2.78（±0.11）μmol/m2·s；地下水位下降导致幼苗气孔导度下降，水分利用效率提高；CO2 加富降低了幼苗
气孔导度，但显著提高了水分利用效率；随着地下水位的下降，幼苗叶绿素含量显著下降、MDA 积累，U2、U3、
U4 的叶绿素含量分别比U1 下降4.6%、14.14%、30.85%，MDA 升高165%、256%、225%，干旱胁迫逐渐加剧，而
多枝柽柳幼苗通过提高脯氨酸、可溶性糖含量以及超氧化物歧化酶（SOD）、过氧化物酶（POD）活性等调控物
质来适应干旱胁迫所带来的影响。 |
| 英文摘要: |
| Saplings of Tamarix ramosissima were planted in pots with simulated water tables（U1，U2，U3 andU4）of depth 1，2，3，4 m，respectively，to study the impacts of water tables on the photosynthetic characteristicsand stress tolerance of T. ramosissima. The results showed that the apparent quantum yield，dark respiration rate，carboxylation efficiency，photorespiration rate and maximum net photosynthetic rate decreased，in addition，theusing range of effective photosynthetic radiation and CO2 concentration reduced with water table lowering. Themaximum net photosynthetic rate of U1 was 25.24（±4.95）μmol/m2·s，and the maximum net photosynthetic rate ofU4 reduced by 88.99%， down to 2.78（±0.11）μmol/m2·s. Also，stomatal conductance of saplings declined and wateruse efficiency increased with water table lowering；CO2 enrichment reduced stomatal conductance of saplings，butsignificantly improved water use efficiency. With water table lowering，chlorophyll content of saplings significantlydecreased and MDA accumulated. Compared to U1，the chlorophyll contents of U2，U3 and U4 decreased by 4.6%，14.14% and 30.85%，MDA increased by 165%，256% and 225%. Drought stress increased gradually，however，T.ramosissima adapted to the effects of drought stress by improving regulating materials like proline，soluble sugarcontent and SOD，POD activity etc. |
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