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水分条件对梭梭气体交换特性的影响
Authors
吴琦,张希明
Publication date
1 January 2005
Publisher
Abstract
对梭梭 (Haloxylonammodendron) 在不同沙地水分条件下的净光合速率 (An)、蒸腾速率 (E)、气孔导度(gs)、水分利用效率 (WUE)和光响应曲线进行了测定和分析。结果表明 ,梭梭的净光合速率、蒸腾速率、气孔导度均随土壤含水率的增加而升高 ,光补偿点 (LCP)随含水率的增加呈下降趋势 ,表观量子效率 (Φ) 随含水率的增加而增大。在沙地含水率为 2 .2 5 %和 2 .6 3%时 ,梭梭的水分利用效率较高 ;含水率为 4 .2 9% ,6 .2 7% ,9.97%时 ,水分利用效率次之 ,且三者差异不大 ;当含水率为 1.6 5 %时 ,水分利用效率最低
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Last time updated on 29/11/2016