秸秆还田下不同施氮量对旱地小麦旗叶衰老及产量的影响__92文库网 关键词：氮素水平；旱地小麦；旗叶衰老；产量 [gap=1821]Key words: dry-land wheat; flag leaf senescence; yield; Nitrogen levels
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There was a close correlation among root senescence and flag leaf senescence and grain filling rate.
根系衰老与旗叶衰老、及与籽粒灌浆速率密切相关。
Photosynthetic rate and chlorophyll content of flag leaf declined sharply, and leaf stomatal resistance increased rapidly in late period of senescence.
衰老后期，根系活力、叶片光合速率和叶绿素含量快速下降，叶片气孔阻力增加。
Soluble protein in flag leaf, which implies senescence of flag leaf, tented to decline with the increase of nitrogen fertilization.
在氮素代谢方面，增施氮肥使小麦旗叶中硝酸还原酶活性增加，旗叶中可溶性蛋白含量降低，可明显延缓小麦叶片的衰老；
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