论文部分内容阅读
沙枣树(Elaeagnus angustifolia)覆膜试验的结果表明,覆膜对沙枣树产胶的增产效果明显,成熟林覆膜后较裸地增产30.3%,单株年产量由86.7g/株增加到112.9g/株;过熟林覆膜后较裸地增产18.0%,单株年产量由76.0g/株增加到86.7g/株。增产是因为覆膜明显地提高了地温,成熟林覆膜后林地的增温效果是13.7%,而过熟林由于土壤过湿,林地的增温效果是2.2%。覆膜增温提高了树木的生理活性,表现在以促进林木速生期的生长速率方式提高了新枝生长量,并且成熟林的速生期还较过熟林长。从生长速率到出胶速率的最大值和最小值的天数及速率分析,覆膜较裸地大,并且成熟林大于过熟林,是生理活性增强出胶量大的主要原因。
The results showed that the plastic film production of sand jujube trees increased significantly, the mature forest increased 30.3% compared with the bare land, the annual output of single plant increased from 86.7g / plant to 112.9g per plant. After over-ripening, the yield of single plant increased from 76.0g / plant to 86.7g / plant compared with bare land. The yield increase was due to the obvious increase of ground temperature. The warming effect of the mature forest after the filming was 13.7%, while that of the over-mature forest was 2.2% because of the soil over-wetting. The plastic film warming increased the physiological activity of the trees, which showed that the growth of new shoots was increased by promoting the growth rate of forest trees at a faster rate and the mature period was faster than the mature ones. From the growth rate to the rate of the maximum and minimum rate of days and the rate of analysis, the coating is larger than the bare land, and the mature forest is more than over-mature forest, is the main reason for increasing the physical activity of a large amount of plastic.