[目的]研究覆膜5、10、15、20、25、30年0～40cm土层残膜量变化特征。[方法](1)每个采样点5个样方，每个样方规格100 cm × 100 cm，逐层测定0～40 cm 土层残膜量;(2)地膜回收情况调查。[结果](1)5～30年0～40 cm 土层土壤残膜量排序 20＞15＞5＞10＞25＞30 年，介于 92。83～195。13 kg/hm2，平均值128。88 kg/hm2;(2)随着年限增加0～10 cm 土层残膜量排序为5＞10＞30＞15＞25＞20年，残膜量差异不显著;10～20 cm 土层残膜量排序依次为15＞20＞30＞10＞5＞25年，15、20年残膜量高，较5、10、25、30年差异显著;20～30 cm 土层残膜量排序依次为15＞20＞10＞25＞5＞30年，15、20年残膜量高，与5、30年对比有显著性差异;30～40 cm 土层残膜量排序依次为20＞25＞5＞15＞30＞10年，20、25年残膜量高，与5、10、15、30年有显著差异。(3)随着土层深度增加5年各土层之间残膜量差异不显著;10年0～30 cm各土层残膜量差异不显著，30～40 cm较其它土层残膜量差异显著;15年10～20 cm与0～10 cm、30～40 cm 土层残膜量差异显著，30～40 cm与10～20 cm，20～30 cm 土层残膜量差异显著;20～30年各土层之间残膜量差异不显著。[结论](1)随着覆膜年限的增加，5～30年0～40 cm 土层内残膜量呈先增后减的趋势，在覆膜20年时达到峰值，呈略下降的趋势;(2)随着覆膜年限增加5～30年0～10 cm 土层残膜量呈先减后增的趋势，总体量呈下降趋势;10～20 cm 土层残膜量呈先增后减的趋势，总体变化不明显;20～30 cm 土层残膜量呈先增后减的趋势，总体量呈略下降趋势;30～40 cm 土层残膜量呈先增后减的趋势，总体呈上升趋势。(3)随着土层深度增加，5～30各年份残膜量呈下降趋势，残膜主要在0～30 cm累积，30～40 cm也有少量残片:覆膜5、10年0～10 cm土层为主要累积区;覆膜15、25、30年10～20 cm 土层为主要累积区;覆膜20年0～10与10～20 cm 土层残膜量基本相同。
Study on spatial and temporal distribution characteristics of plastic film residue
[Objective]To study the variation characteristics of residual film amount in soil layer of 5,10,15,20,25,30 a 0-40 cm.[Methods](1)Each sampling point had 5 quadrats,each quadrat size was 100 cm x 100 cm,and the residual film amount of 0-40 cm soil layer was measured layer by layer.(2)In-vestigation of the basic situation of plastic film recycling.[Results](1)The order of soil residual film in 0-40 cm soil layer was 20＞15＞5＞10＞25＞30 a,ranging from 92.83-195.13 kg/hm2,with an aver-age of 128.88 kg/hm2.(2)With the increase of years,the order of residual film amount in 0-10 cm soil lay-er was 5＞10＞30＞15＞25＞20 a,and the difference of residual film amount was not significant.The order of residual film amount in 10-20 cm layer was 15＞20＞30＞10＞5＞25 a,and the residual film amount in 15 and 20 a was higher than that in 5,10,25 and 30 a,and the difference was significant.The order of residual film amount in 20-30 cm soil layer was 15＞20＞10＞25＞5＞30 a,and the residual film amount in 15 and 20 a was high,which was significantly different from that in 5 and 30 a.The order of re-sidual film amount in 30-40 cm soil layer is 20＞25＞5＞15＞30＞10 a,and the residual film a-mount in 20 and 25 a is higher,which is significantly different from that in 5,10,15 and 30 a.(3)With the increase of soil depth:there is no significant difference in residual film amount between soil layers in 5 a;The residual film amount of 10 a 0-30 cm soil layer was not significantly different,and the residual film amount of 30-40 cm soil layer was significantly different from that of other soil layers.There were significant differences in the residual film amount between 10-20 cm and 0-10 cm and 30-40 cm soil layers at 15 a,and signifi-cant differences between 30-40 cm and 10-20 cm and 20-30 cm soil layers.There was no significant differ-ence in the amount of residual film between the soil layers from 20 to 30 a.[Conclusion](1)With the in-crease of mulching years,the amount of residual film in the 5-30 a 0-40 cm soil layer first increased and then decreased,reaching the peak at 20 a mulching,and showing a slight downward trend overall.(2)With the increase of mulching years,the residual film amount of 5-30a0-10 cm soil layer decreased first and then increased,and the overall trend was downward.The residual film amount of 10-20 cm soil layer in-creased first and then decreased,and the overall change trend was not obvious.The residual film amount of 20-30 cm soil layer first increased and then decreased,and the overall trend was slightly decreasing.The resid-ual film amount in the 30-40 cm soil layer first increased and then decreased,and the overall trend was in-creasing.(3)With the increase of soil depth,the amount of residual film in each year of 5-30 a shows a downward trend,mainly accumulating in 0-30 cm,and a small amount of residual film in 30-40 cm.The 0-10 cm soil layer of 5 and 10 a is the main accumulation area.The main accumulation zone was the 10-20 cm soil layer at 15,25,30 a.The residual film amount of the 0-10 and 10-20 cm soil layers coated with film was basically the same.
万方数据
维普
