不同耕作方式对小麦硝酸还原酶活性和旗叶衰老指标的影响

为了从生理角度揭示不同耕作方式下春小麦产量的差异,重点研究了传统耕作(CT)、秸秆还田(CS)、免耕不覆盖(NT)和免耕覆盖(NTS)等4种处理方式对干旱区春小麦硝酸还原酶(NR)活性和旗叶衰老指标的影响。结果表明:翻耕CS与对照CT无显著差异,免耕方式NT和NTS对其花后旗叶叶绿素含量或叶面积指数的影响均表现为显著差异,其大小均为NTS>NT>CS>CT;在小麦花后的各时期,除CS外,免耕方式对NR活性的影响呈显著差异,NTS表现为最优,其次分别为NT、CS和CT;综合以上生理特性,NTS处理最有利于延缓叶绿素的降解和NR活性的提高,减缓叶片衰老,表现最佳。

Effect of Different Tillage on Flag Leaf Senescence Index and Nitrate Reductase Activity of Spring Wheat

In order to reveal the difference of spring wheat yield under different treatments in physiological field,the effects of four different tillage treatments on flag leaf senescence index and nitrate reductase activity of spring wheat in arid areas were emphatically studied.These four different tillage treatments were conventional tillage(CT),conventional tillage with straw incorporated(CS),no-till with no straw cover(NT) and no-till with straw cover(NTS).The main results showed that there were no significant differences between CS and CT under different treatments,but there were significant differences between NTS,NTand CT.The effect of different treatments was in the following order:NTS>NT>CS>CT.After anthesis every period apart from CS,the NR activity in the no-tillage methods showed significant differences compared with the CT.The NTS treatment was optimum,followed by NT,CS and CT.To sum up,the degradation of chlorophyll was delayed obviously and the NR activity was increased and the leaf senescence was slowed down in the NTS treatment,so the NTS was the best treatment.