不同类型地膜覆盖和环境条件对蔬菜土壤温度的影响

以不覆盖地膜为对照,选用普通聚乙烯PE黑色地膜和生物黑色降解膜,观察生物降解地膜在露地、单体大棚、连栋大棚等不同环境条件下的蔬菜覆盖后,其增温与普通塑料地膜之间的差异。结果表明:应用生物黑色降解膜和普通聚乙烯PE黑色地膜膜的增温效果接近,露地和单体大棚内比不使用地膜平均提高地温1℃左右,连栋大棚内增温效果稍差。在露地条件下,塑料地膜覆盖下的土壤温度变化很大,白天增温很高,而夜晚则下降到和不同地膜相同的低温,而降解膜覆盖下地温变化幅度就比较小,在昼夜温差大的天气夜间最低温比塑料地膜高2℃左右。由此可见,在露地条件下,生物降解地膜夜间的保温效果要好于普通塑料地膜,更适合在露地早春作物上进行覆盖,有效抑制杂草生长。

Effects of different types of plastic film mulching on soil temperature

Compared with non-covering plastic film, common PE black plastic film and biodegradation plastic film were used to observe the effect of covering vegetable with biodegradation plastic film under different environmental conditions, such as open field, monomer greenhouse, multi-span greenhouse, etc. , the difference between its warming and ordinary plastic film. The results showed that the warming effect of bioblack degradable film was similar to that of PE black film, and the average ground temperature was increased by about 1 ° C in the open field and in the monomer greenhouse, the effect of temperature increase in multi-span greenhouse is slightly poor. Under the open field condition, the soil temperature under plastic film mulch varies greatly, increasing very high during the day, but at night it drops to the same low temperature as that under different plastic film mulch, and the variation range of soil temperature under plastic film mulch is relatively small, the lowest temperature at night is about 2 ° C higher than that of plastic film in the day and night weather with large temperature difference. Therefore, under the open field condition, the heat preservation effect of biodegradable film is better than that of plastic film at night, and it is more suitable to cover crops in the open field in early spring, which can effectively inhibit the growth of weeds.