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OALib Journal期刊
ISSN: 2333-9721
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几种荒漠植物对干旱过程的生理适应性比较
DOI: 10.3724/SP.J.1145.2008.00763, PP. 763-768
Keywords: 荒漠植物,胡扬,花棒,梭梭,水势,干旱,光合作用,蒸腾作用,水分利用效率
Abstract:
在甘肃临泽实地取样进行试验，比较了胡杨、花棒和梭梭等荒漠植物离体枝条的光合、蒸腾作用对组织水势降低的响应，以探讨其对干旱过程的适应性.结果显示，梭梭在？2~？5.5mpa、胡杨在？1~？4.5mpa的枝叶水势下具有较高的光合速率和水分利用效率，花棒和二白杨则在水势低于？2mpa时光合速率和水分利用效率均显著下降；同时，梭梭的最大蒸腾速率不足2mmolm-2s-1，而同样条件下胡杨和二白杨的最大蒸腾速率则在4~6mmolm-2s-1.因此，几种荒漠植物中，梭梭最能够适应干旱荒漠环境；胡杨因蒸腾失水较多而对环境水分有较强的依赖性，适应极端干旱的能力不及梭梭；花棒虽具有蒸腾耗水少的特点，但因在环境严重缺水时光合效率低而影响了其对荒漠的适应能力.图5参25
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