永久萎蔫 (permanent wilting) 亦称永久凋萎。指由于土壤含水量的减少,植物的吸水几乎停止,植物在很弱的蒸腾作用下失去水分,致呈现完全萎蔫状态。发生永久萎蔫时,土壤水势等于或低于植物根的水势,因此植物无法吸收水,致呈现完全萎蔫状态。
其永久萎蔫系数均低于3%。表明这二种枣树的抗旱能力较强。
Permanent wilting coefficient of two jujube varieties both lower than 3%, jujube has higher drought capacity.
枣树幼树叶片的永久萎蔫系数为3.5 %,而枣树大树叶片的永久萎蔫系数应在3%左右。
The permanent wilting coefficient of young jujube trees was 3.5 percent, but that of elder trees was about 3 percent.
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