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不同增温方式下芦苇植硅体数量变化特征的对比分析

, PP. 977-987

Keywords: 增温方式,芦苇,植硅体,数量

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Abstract:

由于未来全球变暖的情况仍可能持续,了解陆地生态系统对温度升高的响应对研究全球变化具有重要的参考价值。本文利用开顶式气室(OpenTopChamber,简称OTC)和红外线辐射器(InfraredRadiator,简称IR)对位于松嫩草原西南部吉林省长岭县腰井子村种马场境内的芦苇(Phragmitescommunis)群落进行模拟温度升高处理,研究增温对芦苇植硅体数量的影响。OTC增温方式设置两种不同的规格,分别用OTC-Ⅰ和OTC-Ⅱ表示,即本文利用OTC-Ⅰ、OTC-Ⅱ和IR这3种不同的增温方式来模拟温度升高,每种增温方式均设置了3个不同温度梯度的增温处理和1个对照处理,以期更详细的研究芦苇中植硅体数量与温度因子之间的动态关系。实验发现,3种不同增温方式对芦苇鞍型植硅体和芦苇硅化气孔的影响一致,即增温后芦苇鞍型植硅体的数量增加、芦苇硅化气孔的数量有所减少;在3种不同增温方式的影响下,芦苇尖型植硅体对增温的响应存在差异,在OTC(OTC-Ⅰ、OTC-Ⅱ)增温方式下,增温后芦苇尖型植硅体的数量减少,但在IR增温方式下,增温后芦苇尖型植硅体的数量增加。通过对比不同增温方式下芦苇植硅体数量变化特征的异同,有利于得出比较全面和令人信服的结论,同时为今后广大学者根据实际情况选择适宜的增温装置提供参考。

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