李鹭辰;桂子洋;秦树高;张宇清;刘靓;杨凯捷;

• 1:北京林业大学水土保持学院宁夏盐池毛乌素沙地生态系统国家定位观测研究站
• 2:北京林业大学水土保持国家林业和草原局重点实验室

摘要(Abstract)：

【目的】明确毛乌素沙地4种典型植物沙蓬、软毛虫实、刺藜和苦豆子的叶片凝结水吸收能力,阐明植物叶片对凝结水浸润的水分生理响应。【方法】将受试植物置于用高丰度氘水配置的人工标记凝结水环境中,进行凝结水浸润处理,通过比较处理组和对照组植物叶水、根水及根际土壤水的稳定氢同位素丰度变化,确定受试植物叶片是否具有吸水能力,示踪叶片吸收凝结水后,是否将水分转移到植物根系及根际土壤之中;使用露点水势仪、电子天平及气孔计,测定受试植物处理前后的叶水势、叶片含水量和气孔导度变化,了解受试植物对凝结水浸润的水分生理响应。【结果】(1)高丰度氘标记凝结水浸润后,处理组4种受试植物的叶水δ~2H(20‰～100‰)均显著高于对照组(-25‰～-15‰),而根水(-45‰～-30‰)及根际土壤水(-50‰～-40‰)则与对照组无显著差异;(2)经过凝结水浸润试验处理,沙蓬的叶水势升高23.81%,叶含水量升高2.94%,气孔导度降低57.40%;软毛虫实的叶含水量升高了2.45%,叶水势和气孔导度无显著变化;刺藜的叶水势升高了21.95%,气孔导度和叶含水量无显著变化;苦豆子的叶水势、叶含水量和气孔导度均无显著变化。【结论】毛乌素沙地4种典型植物叶片均具有凝结水吸收能力,叶片吸收的水分未被发现转移至根部或根际土壤。沙蓬、软毛虫实、刺藜通过叶片吸水显著改善了自身水分生理状态,这可能是其适应沙地严酷水分条件的重要水分利用机制,有助于植物存活,而苦豆子叶片对凝结水浸润无明显响应,不能有效利用叶片吸水改变其水分生理状态。

关键词(KeyWords)： 凝结水;叶片吸水;生理响应;水分利用策略;沙生植物

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年科学基金项目(31700638);; 中央高校基本科研业务费专项(2015ZCQ-SB-02)

作者(Author): 李鹭辰;桂子洋;秦树高;张宇清;刘靓;杨凯捷;

Email:

DOI:

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