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水分胁迫下荒漠地区2种草本植物生物量分配策略

, PP. 432-439

Keywords: 水分胁迫,根冠比,荒漠地区,涩荠(Malcolmia,africana),角果藜(Ceratocarpus,arenarius)

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Abstract:

水分胁迫是荒漠地区生态系统结构和功能变化的主要驱动力。分析水分胁迫下,不同生长阶段荒漠植物生物量在地上-地下的分配比例,对精确估算地下有机碳存储量有重要的理论意义。通过盆栽控制实验,设置对照、中度和重度胁迫的水分梯度,选取荒漠地区2种草本植物涩荠(Malcolmiaafricana)和角果藜(Ceratocarpusarenarius),分析其生物量在地上-地下的分配比例变化。结果表明无论水分胁迫存在与否,总生物量累积均符合Sigmoidal生长模型;水分胁迫对植株早期发育阶段总生物量的累积无明显影响,但显著减少了发育后期总生物量的累积;植株每生长10d,涩荠和角果藜叶片占总生物量的比例分别减少8.9%~10.6%和3.1%~3.4%。几乎等同于茎所增加的比例。水分胁迫使得地下生物量显著增加,但总生物量的累积仍以地上部分为主;根冠比在整个生长过程中呈4个渐变的阶段。

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