加气滴灌和可降解膜覆盖对玉米生长发育及水分利用的影响

Effects of aerated drip irrigation and degradable film mulching on growth and water use of maize

  • 摘要: 为揭示加气滴灌对降解地膜覆盖下玉米产量降低的补偿机制, 设置3种地膜覆盖(诱导期60 d和100 d氧化生物双降解地膜、普通塑料地膜)和2种灌水方式(加气滴灌和不加气滴灌)进行完全组合试验, 分析不同处理对玉米生长、光合特性、产量和水分利用效率的影响。结果表明, 诱导期60 d和100 d可降解地膜分别在覆膜50 d和70 d后呈现初始裂纹。与普通塑料地膜相比, 可降解地膜覆盖玉米产量和水分利用效率较普通塑料地膜分别显著降低14.81%~27.42%和16.70%~34.46% (P<0.05)。加气滴灌提高了玉米株高、茎粗、叶面积指数, 减少了玉米耗水量; 与不加气处理对比, 加气滴灌下玉米净光合速率显著增加10.40% (P<0.05), 蒸腾速率显著增加12.86% (P<0.05), 气孔导度显著提高25.99% (P<0.05), 干物质积累量显著增加7.57% (P<0.05), 加气滴灌还可使降解地膜和普通塑料地膜覆盖下玉米产量和水分利用效率平均提高6.44%~14.41%和9.09%~17.90% (P<0.05), 可减少由于降解地膜过早降解而造成的产量及水分利用效率的下降。研究认为诱导期为100 d氧化生物双降解膜地膜覆盖下进行加气滴灌可代替新疆绿洲区传统塑料地膜覆盖下滴灌玉米栽培措施。本研究可为新疆膜下滴灌缓解残膜污染, 提高玉米产量及水分利用效率提供理论依据。

     

    Abstract: Xinjiang is a typical arid area in China with scarce precipitation and intense water evaporation. Plastic film mulching increases temperature, preserves moisture, prevents weed growth, inhibits water evaporation, and improves crop yield. However, with the overuse of traditional plastic film, residual plastic film is constantly increasing in farmland, which has led to negative impacts, such as environmental pollution and decreased soil aeration. This study aimed to explore the effects of aerated drip irrigation and degradable film mulching on the growth and yield of maize and to reveal the compensation mechanism of aerated irrigation on maize yield reduction under degradable mulching film. Three kinds of films (oxidative biodegradable plastic films with induction periods of 60 and 100 days, and traditional polyethylene film) and two irrigation methods (aerated drip irrigation and non-aerated drip irrigation) were set up for a complete combination experiment to analyze the effects of different treatments on the growth, photosynthetic characteristics, yield, and water use efficiency of maize. The results showed that the cracks initially appeared 50 and 70 days after mulching under biodegradable plastic films mulching with induction periods of 60 and 100 days, respectively. Compared to traditional plastic mulching, maize yield and water use efficiency (WUE) under degradable plastic mulching were significantly reduced by 14.81%–27.42% and 16.70%–34.46% (P<0.05), respectively. Aerated drip irrigation increased plant height, stem diameter, and leaf area index, and reduced water consumption of maize. Compared to non-aerated drip irrigation, the net photosynthetic rate, transpiration rate, stomatal conductance, and dry matter accumulation of maize significantly increased under aerated drip irrigation by 10.40%, 12.86%, 25.99%, and 7.57% (P<0.05), respectively. Aerated drip irrigation significantly increased maize yield and WUE by 6.44%–14.41% and 9.09%–17.90% on average (P<0.05) under degradable mulching film and plastic mulching film, respectively. The decline in yield and WUE caused by premature degradation due to degradable film mulching was reduced by aerated drip irrigation. It was concluded that aerated drip irrigation combined with oxidative biodegradable film with an induction period of 100 days can replace the traditional drip irrigation of maize under plastic film mulching in the oasis of Xinjiang. This study provides a theoretical basis for reducing residual film pollution and improving maize yield and water use efficiency by aerated drip irrigation under mulch in Xinjiang.

     

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