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以‘济麦20’为供试材料,通过田间试验,在拔节期和开花期设置土壤相对含水量为65%(W_(65))、70%(W_(70))和75%(W_(75))的测墒补灌处理,以全生育期不灌溉为对照(CK),研究不同测墒补灌水平对旗叶光合特性及酶活性的影响.结果表明:W_(70)处理小麦旗叶净光合速率、蔗糖含量和磷酸蔗糖合成酶(SPS)活性在花后14~21 d均显著高于其他处理.成熟期W_(70)处理干物质量与W_(75)处理无显著差异但显著高于W_(65)处理和CK;W_(70)处理单茎质量显著高于其他处理W_(70)处理超氧化物歧化酶和过氧化氢酶活性及可溶性蛋白含量在花后14~28 d显著高于其他处理,丙二醛含量在花后14~28 d显著低于CK和W_(65)处理,与W_(75)处理无显著差.异2012-2013年和2013-2014年W_970)处理小麦籽粒产量分别为8941.4和9125.4 kg·hm~(-2),与W_(70)处理无显著差异显著高于W_(65)处理和CK;W_(70)处理水分利用效率显著高于其他处理.在本试验条件下,拔节期和开花期0~140 cm土层平均土壤相对含水量均以70%为节水高产高效的最佳灌溉处理.
The results showed that the relative water content of soil was 65% (W_ (65)), 70% (W 70) and 75% (W_ (70)) at the jointing and flowering stages. 75)) under different soil moisture conditions as control (CK), the effects of different irrigation levels on the photosynthetic characteristics and enzyme activities of flag leaves were studied.The results showed that the W_ (70) Leaf net photosynthetic rate, sucrose content and SPS activity were significantly higher than those of the other treatments at 14-21 d after anthesis.The dry matter content of W 70 in mature stage was not significantly different from that of W 75 treatment The stems of W_ (70) and W_ (70) treated with W_ (70) were significantly higher than those treated with W_ (70) and W_ (70) The content of MDA was significantly lower than that of CK and W 65 (P <0.05) at 14-28 days after flowering, which was not significantly different from that of W 75 (W 2012) The grain yield of treated wheat was 8941.4 and 9125.4 kg · hm -2, respectively, which was significantly higher than that of W_ (70) and W_ (70), and that of W_ (70) was significantly higher than that of W_ (70) In this test Under conditions, jointing and anthesis average soil Soil 0 ~ 140 cm relative moisture content of 70% are best for the water-saving irrigation high yield and efficiency.