雒宇;马莉;靳川;李鑫豪;李成;贾昕;查天山;

• 1:北京林业大学水土保持学院
• 2:宁夏盐池毛乌素沙地生态系统国家定位观测研究站
• 3:北京林业大学水土保持国家林业局重点实验室
• 4:北京市园林设计工程有限公司

摘要(Abstract)：

【目的】探究干旱半干旱地区植被光合生理在生长季动态变化及其对各个影响因子的响应机制,对进一步了解该区植被对波动环境的适应性具有重要意义。【方法】该研究于2019年5-9月,对典型沙生植被油蒿的光合电子传递速率(ETR)进行长期原位连续监测,同步观测光合有效辐射(PAR)、空气温度(T_a)、相对湿度(RH)和土壤含水量(SWC)等环境因子,同时测定叶绿素含量(SPAD)。分析ETR的动态变化规律及其对主要影响因子的响应。【结果】ETR与PAR、T_a、SPAD显著相关(P <0.05),ETR月均值7月份达到最大,9月份最小。ETR随光强的变化呈上升趋势,且在弱光条件下(PAR≤800μmol/(m~2·s))对光照响应强度大于强光。ETR随T_a的变化呈先上升后下降的趋势,5月(展叶期)和9月(落叶期)的高低温胁迫阈值分别为5和20℃,6-8月(成熟期)为10和25℃。ETR与SPAD呈线性正相关关系。成熟期ETR的稳定性小于展叶期和落叶期。【结论】通过以上研究发现PAR、T_a、SPAD是影响ETR的3个主要因子。在展叶期ETR主要受SPAD的影响,成熟期主要受温度和光强的影响,落叶期主要受植物生理的影响。油蒿在不同环境因子的交替作用下均体现出了良好的适应性。此外适当的升温能够促进光合电子的传递,增强植物光合能力。该研究结果可以为全球气候变暖下植物光合生理对环境响应的研究提供一定的理论指导,同时也为荒漠植被的恢复提供参考。

关键词(KeyWords)： 油蒿;光合电子传递速率;光合有效辐射;空气温度;叶绿素含量

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(31670710、31670708)

作者(Author): 雒宇;马莉;靳川;李鑫豪;李成;贾昕;查天山;

Email:

DOI:

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