作 者 ：韦兰英*,袁维圆,焦继飞,张建亮,尤业明,莫凌,黄玉清,李先琨
期 刊 ：生态学报 2009年 29卷 12期 页码：6772~6778
Keywords:specific leaf area, photosynthetic characters, polyacrylamide, Medicago sativa and Cichorium intybus,
摘 要 ：为研究紫花苜蓿（Medicago sativa）和菊苣（Cichorium intybus）叶片生长和光合生理对不同用量保水剂的适应能力和生理响应机制，以不施保水剂作为对照（CK），测定了施用不同用量保水剂（15 kg?hm-2，30 kg?hm-2）条件下大田种植的紫花苜蓿（Medicago sativa）和菊苣（Cichorium intybus）的比叶面积和光合特性。结果表明，保水剂对紫花苜蓿的比叶面积无显著影响（P>0.05），但对菊苣的比叶面积具有显著影响（P<0.05）。对紫花苜蓿而言，保水剂施用量为15 kg?hm-2时，其Pn、gs和WUE均显著高于对照（P<0.01），但施用量为30 kg?hm-2处理时，其Pn、和gs均显著低于对照处理（P<0.01），但是却维持较高的WUE；对菊苣而言，施用保水剂降低了其Pn和Tr（P<0.01），但WUE与对照无显著差异（P>0.05），这表明紫花苜蓿和菊苣采取两种不同的生理适应策略来适应变化了的水分环境条件。紫花苜蓿Pn与gs、Pn与Tr的相关性均以保水剂施用量为30 kg?hm-2处理最紧密（P<0.01），而Pn与WUE的相关性则以对照最为紧密，依次为15 kg?hm-2处理和30 kg?hm-2处理；菊苣Pn与gs、Tr和WUE的相关性强弱均表现为15 kg?hm-2处理<30 kg?hm-2处理<对照，表明保水剂影响叶片气体交换参数之间的关系。研究表明，不同植物叶片参数和光合特性对保水剂的响应并不具有一致性，植物可以根据环境条件的变化调节其形态和生理过程，以维持其正常生长。
Abstract:This study was conducted to investigate the response of specific leaf area (SLA) and photosynthesis of Medicago sativa and Cichorium intybus grown under field environmental conditions to the super absorbent polymer (SAP). The SAP was added to the soil at the following rates: 0 (CK), 15 kg·hm-2 and 30 kg·hm-2. The results showed that the SAP had no significant effect on the SLA of Medicago sativa（P>0.05）, while it had significant effect on that of Cichorium intybus（P<0.05）. Applied with 15 kg·hm-2 of SAP, Medicago sativa had higher Pn, gs and WUE than the CK significantly（P<001）, but when applied with 30 kg·hm-2 of SAP, its Pn and gs were significantly lower than that of the CK（P<001）, maintaining with high WUE; for Cichorium intybus, the Pn and Tr were lower after applied with SAP, but there is no significant difference between its WUE and that of the CK（P>0.05）, indicating that these two species responded to the changed water environmental conditions by taking two different physiological reactions respectively. The correlations between Pn and gs, Pn and Tr of Medicago sativa applied with 30 kg·hm-2 of SAP were the most closely connected（P<0.01）, while the correlation between Pn and WUE of the CK were the most closely connected, next were the treatments with 15 kg·hm-2 and 30 kg·hm-2 of SAP respectively; for Cichorium intybus, the connections of correlations between Pn and gs, Tr and WUE all showed in the following order: treatment with 15 kg·hm-2 of SAP< treatment with 30 kg·hm-2 of SAP 全 文 ：