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复水前后冬小麦光合生理特征对保水剂用量的响应

, PP. 116-123

Keywords: 冬小麦,水分胁迫,复水,保水剂,光合特征

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Abstract:

为探明干旱胁迫复水前后作物水分消耗过程中冬小麦生理特征对保水剂用量的响应及作用机理,采用盆栽试验以不施保水剂为对照,测定了保水剂不同用量(无保水剂、27mg/kg、54mg/kg、81mg/kg)条件下,复水前后的土壤含水率及光合参数的持续变化特征。结果表明:干旱胁迫时,保水剂降低了小麦叶片光合速率、蒸腾速率、气孔导度,提高了水分利用效率。复水后,对照的光合速率、蒸腾速率及气孔导度仍较高,保水剂处理依次为:54mg/kg、81mg/kg、27mg/kg。而当土壤含水率降至田间持水量的55%左右时,各处理光合参数依次为:27mg/kg、CK、54mg/kg、81mg/kg;水分利用效率依次为:81mg/kg、27mg/kg、CK、54mg/kg。随保水剂用量的增加,小麦生物量增加,但81mg/kg处理显著高于对照。同时,保水剂会影响叶片光合参数之间的相关性,其中,小麦气孔导度与光合速率、蒸腾速率的相关性以54mg/kg处理最紧密,依次为81mg/kg处理、对照,27mg/kg处理最差。而气孔导度与土壤含水率、水分利用效率及光合速率与土壤含水率、蒸腾速率、水分利用效率的相关性强弱从大到小的处理依次为:81mg/kg、54mg/kg、CK、27mg/kg。说明小麦叶片光合参数对保水剂的响应以54mg/kg与81mg/kg处理最显著。

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