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1987年春我们进行了石榴造林后地膜覆盖试验,成活率达98％。其具体做法是:石榴苗木截干栽植后,树穴内浇透水,水渗后穴面铺盖塑料薄膜。薄膜中间留一小孔,使苗干外露3—4个芽,并将小孔及薄膜周围用土埋严,以免被风刮掉。实践证明,用地膜覆盖穴面能减少土壤水分蒸发。据4月10日调查,0—30厘米土层内,覆盖后平均土壤含水率为7.14％,而不盖地膜的土壤含水率仅5.01％,提高42.5％。 地膜覆盖后,土壤温度4月份平均提高0.7～1.2℃,有利于苗木根系活动,也是提高造林成活率的一个重要因素。
In the spring of 1987, we carried out the plastic film mulching experiment with pomegranate afforestation, with a survival rate of 98%. The specific approach is: pomegranate seedlings truncated planting, the tree hole drenched water, water seepage surface covered plastic film. Leave a small hole in the middle of the film, the seedlings dry exposed 3-4 buds, and holes and thin film buried around the soil, so as not to be scraped by the wind. Practice has proved that the cover with mulch hole can reduce soil moisture evaporation. According to a survey conducted on April 10, in 0-30 cm soil layer, the average soil water content after covering was 7.14%, while the soil moisture content without covering film was only 5.01%, increased by 42.5%. After mulching, soil temperature increased by 0.7-1.2 ℃ on average in April, which is beneficial to seedling root activity and also an important factor for improving the survival rate of afforestation.