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梨树县榆树台林场于1985—1987年连续三年对杨树插条育苗地膜覆盖技术进行了试验研究。对不同膜色、不同扦插密度、不同扦插时间作了苗高、地经、根系、地温(积温)、土壤湿度、根(茎)重量、叶面积等十几个项目的观测。结果表明,膜色(黑、白两色)不同增温效果亦不同,不同扦插密度、时间对苗木生长都有着直接影响。据观测,从扦插到展叶所需大于5℃的土壤活动积温约为恒定值(117—118℃),这样如果适时早覆膜、早插条可以延长苗木生长期。因覆膜可使苗木生长提前进入速生期,苗木生长健壮,所以覆膜的苗木在地径、根系生长及叶面积都明显大于无膜的。
Lushushu Yushu Tailan Field in 1985-1987 for three consecutive years of poplar seedling film mulching techniques were studied. The effects of different film colors, different cutting density and different cutting times on the seedling height, ground type, root system, ground temperature (accumulated temperature), soil moisture, root / stem weight and leaf area were observed. The results showed that the effects of different warming of the membrane color (black and white) were also different. Different cutting density and time had a direct impact on the growth of seedlings. It has been observed that the accumulated accumulated temperature of soils above 5 ℃ from cuttage to leaf expansion is about constant (117-118 ℃), so early cuttings can prolong the seedling growth period if early filming is timely. Because the film can make seedling growth advance into the fast-growing period, seedlings grow robust, so the coated seedlings in diameter, root growth and leaf area were significantly greater than without membrane.