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研究田间滴灌条件下降解地膜的降解性能和水、热效应以及对玉米产量性状的影响。结果表明,降解地膜在玉米生育前期降解速度明显快于中、后期,覆盖150 d降解至5级,质量损失率51.37%;降解地膜具有普通地膜相当的保墒增温作用,且克服了普通地膜在玉米生育中、后期对雨水的阻碍作用,能促进雨水入渗吸收,0～20 cm土壤含水量比普通地膜高1.08%～3.90%,21～40 cm土壤含水量比普通地膜高0.91%～2.13%;6月末地膜裂解后,土壤温度低于普通地膜,避免高温对根系的伤害,有利于玉米根系的生长;降解地膜处理产量比普通地膜低0.34%,差异不显著;比不覆膜(CK)增产17.37%,差异显著。
The effects of drip irrigation on the biodegradability, water and heat effects of degrading mulching film and the yield characters of maize were studied. The results showed that the degradation rate of degraded mulching film was significantly faster than that of the middle and late stages of maize. The mulching film degraded to grade 5 after 150 days and the mass loss rate was 51.37%. The degradable mulch film had the same effect of increasing soil moisture, Maize growth in the late impediment to the rain can promote the infiltration of rainfall infiltration, 0 ~ 20 cm soil moisture than ordinary mulch 1.08% ~ 3.90%, 21 ~ 40 cm soil moisture than ordinary mulch 0.91% ~ 2.13 %. The soil temperature was lower than ordinary mulching film at the end of June, avoiding the damage to the root system by high temperature, which was beneficial to the growth of maize roots. The yield of mulching film was 0.34% lower than that of common mulching film, ) Increased 17.37%, the difference was significant.