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中国沙漠  2014 

梭梭(Haloxylonammodendron)叶片气孔导度与气体交换对典型降水事件的响应

DOI: 10.7522/j.issn.1000-694X.2013.00333

Keywords: 河西走廊,梭梭(Haloxylonammodendron),C4植物,气孔导度,气体交换

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Abstract:

C4植物以其较高的水分利用效率而表现出较强利用荒漠环境有限降水的能力,但对其气孔行为和气体交换对降水响应的理解并不深入。本研究选择荒漠区沙丘上6~7年生的梭梭(Haloxylonammodendron),利用自制的降水拦截设施,将每次降水事件后样地中接受的降水量分别减少和增加10%、20%和30%,形成包括对照在内的7个降水梯度,研究梭梭气孔导度(Gs)与净光合速率(Pn)对典型降水事件的响应。结果表明:6~12mm的降水对土壤水分的补给集中在50cm土壤深度范围内。降水量每增加10%,Gs和Pn分别增加9.17%和4.17%;Gs和Pn在降水前后呈现先增加后降低的单峰型趋势,峰值出现在降水后第1天,两者与土壤水分含量(SVWC)、空气相对湿度(RH)以及水汽压差(VPD)显著相关。降水后梭梭黎明前叶水势在-2.08~-2.74MPa时叶片气体交换主要受气孔因素影响,而当叶水势降至-3.16MPa以下时主要受非气孔因素控制。

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