苗期刈割伤害对春小麦生长及产量的影响

Effect of clipping at seedling stage on growth and yield of spring wheat

通过1996年大田试验研究了黄土高原半干旱区春小麦苗期(三叶一心期)受到不同强度刈割伤害(模拟动物的采食)后的补偿作用.结果表明,在大田试验条件下,受轻度刈割(刈割一半叶面积,H0,H1)春小麦的补偿效应大于受重度刈割(刈割全部叶面积T0,T1)春小麦的补偿效应,且都低于未受刈割处理(对照,CK0,CK1),即 CK0>H0>T0;CK1>H1>T1.刈割处理后,灌溉一次水(CK1,H1,T1)虽可增强其补偿能力,促进小麦的生长,但仍为低补偿.

The compensation for spring wheat (Triticum aestivum ) under simulated herbivory stress by clipping was examined in a semi-arid region of Gansu province in 1996. The results showed that clipping at seedling stage reduced spring wheat growth under two irrigation conditions. The yield of spring wheat generally under-compensated the clipping effect. Heavy clipping (cutting all leaves above the ground, T0, T1 ) resulted in a more serious reduction in yield, compared with light clipping cutting half of the leaves, H0, H1 ). The yields of all treatments were lower than controls(CK0,CK1),i.e., CK0>H0>T0>CK1 >H1 >T1. Irrigation for once right after clipping increased wheat growth and its compensatory ability, although they were still under-compensation.