Xiong Xiao-Bin, Wang Peng-Yang, Zhao Ze-Ying, Han Zi-Yu, Song Yuan, Zhu Ying, Wang Yi-Bo, Zhang Jin-Lin, Guo Xu-Sheng, Zhang Xiao-Feng, Lu Xiao-Yu, Xiong You-Cai
State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, College of Ecology, Lanzhou University, Lanzhou, 730000, China.
Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing, 100012, China.
J Environ Manage. 2025 Aug;390:126356. doi: 10.1016/j.jenvman.2025.126356. Epub 2025 Jun 26.
It is crucial to lessen secondary pollution of plastic film mulching (PFM) in drylands, where high and stable yielding of crops are highly dependent on PFM. To explore the solution, field investigations were conducted in dryland maize using the plastic films with four different thicknesses (0.015, 0.010, 0.008 and 0.006- mm) in an arid oasis site of northwest China (no-mulching as control group - CK). The results indicated that the release rate of phthalate acid esters (PAEs) tended to decline with increasing film thickness, up to the lowest in 0.015-mm films (19.7 %), significantly lower than others (p < 0.05). It was significant negatively associated with surface integrity of plastic films after aging, since the damaged area was only 3.5 % in 0.015-mm film, but up to 17.3 % in 0.010-mm, 19.2 % in 0.008-mm and 32.2 % in 0.006-mm thick films, respectively. Thicker PFM was observed to have less plastic fragment residues in soils, due to the higher recycling rate. Moreover, it optimized soil hydrothermal status across two growing seasons, and 0.015-mm plastic film significantly improved the accumulations of soil microbial biomass carbon and nitrogen by 1.4-15.5 % and 3.5-22.6 % relative to CK, also superior to others. The concentrations of easily oxidizable organic carbon and dissolved organic carbon in soils were improved by 8.9-9.8 % and 3.4-6.2 % in 0.015-mm plastic film respectively, relative to CK, significantly greater than others. Under conventional irrigation regime, the grain yield was the highest in 0.015-mm film group, up to 18,091 kg/ha, significantly greater than that of other groups. Thus, thick plastic film acted as a promising solution to lessen secondary pollution footprint while boosting environmental and productive merits in arid areas.
在旱地减少地膜覆盖的二次污染至关重要，因为旱地作物的高产稳产高度依赖地膜覆盖。为探索解决方案，在中国西北干旱绿洲地区的旱地玉米田进行了实地调查，使用了四种不同厚度（0.015、0.010、0.008和0.006毫米）的塑料薄膜（不覆盖地膜作为对照组 - CK）。结果表明，邻苯二甲酸酯（PAEs）的释放率随薄膜厚度增加而趋于下降，在0.015毫米薄膜中降至最低（19.7%），显著低于其他薄膜（p < 0.05）。它与老化后塑料薄膜的表面完整性呈显著负相关，因为0.015毫米薄膜的破损面积仅为3.5%，而0.010毫米薄膜为17.3%，0.008毫米薄膜为19.2%，0.006毫米薄膜为32.2%。观察到较厚的地膜在土壤中的塑料碎片残留较少，因为回收率较高。此外，它在两个生长季节优化了土壤水热状况，0.015毫米塑料薄膜相对于CK显著提高了土壤微生物生物量碳和氮的积累，分别提高了1.4 - 15.5%和3.5 - 22.6%，也优于其他薄膜。相对于CK，0.015毫米塑料薄膜分别使土壤中易氧化有机碳和溶解有机碳的浓度提高了8.9 - 9.8%和3.4 - 6.2%，显著高于其他薄膜。在常规灌溉制度下，0.015毫米薄膜组的粮食产量最高，达到18,091公斤/公顷，显著高于其他组。因此，厚塑料薄膜是减少干旱地区二次污染足迹同时提升环境和生产效益的一个有前景的解决方案。
