生物降解地膜对植烟土壤温室气体排放的影响

Effects of Biodegradable Mulch Film on Greenhouse Gas Emission from Tobacco-planting Soil

为探讨生物降解地膜对植烟土壤肥力指标和温室气体排放的影响。采用盆栽试验,研究植烟土壤温室气体排放对不同生物降解地膜施入量T1(0.05 g/kg)、T2(0.50 g/kg)和T3(5 g/kg)的响应及其影响因素。结果表明:与对照(CK)相比,生物降解地膜处理CO_(2)、CH_(4)和N_(2)O排放通量分别增加了5.00%~47.00%、-15.79%~65.79%和18.75%~56.25%。同时,生物降解地膜处理土壤全氮和铵态氮含量分别增加了2.38%~4.29%和9.73%~56.38%,但土壤pH降低了8.64%~10.26%。土壤CO_(2)排放通量与土壤有机质和全氮呈显著正相关,与硝态氮含量呈显著负相关;CH_(4)排放通量与土壤全钾呈显著正相关,但与有机质含量呈显著负相关。因此,在施用生物降解地膜消除普通地膜“白色污染”的同时,应注意CO_(2)和N_(2)O等温室气体排放增加带来的潜在环境风险。

In order to explore the effects of biodegradable mulch film on soil fertility index and greenhouse gas emission of tobacco planting soil,the response and influencing factors of soil greenhouse gas emission to different application amounts(T1(0.05 g/kg),T2(0.50 g/kg)and T3(5 g/kg))of biodegradable mulch film were studied by pot experiments.The results showed that compared with CK treatment,the emission fluxes of CO_(2),CH_(4)and N_(2)O for the treatment of biodegradable mulch film increased by 5.00%~47.00%,-15.79%~65.79%and 18.75%~56.25%,respectively.Meanwhile,soil total nitrogen and ammonium nitrogen contents increased by 2.38%~4.29%and 9.73%~56.38%,respectively,but the pH decreased by 8.64%~10.26%.Soil CO_(2)emission flux was significantly positively correlated with soil organic matter and total nitrogen,but significantly negatively correlated with nitrate nitrogen content.The CH_(4)emission flux was significantly positively correlated with soil total potassium,but significantly negatively correlated with soil organic matter content.Therefore,it should be considered that the increase of greenhouse gas emissions such as CO_(2)and N_(2)O would cause the potential environmental risks when using biodegradable mulch film to eliminate the“white pollution”of ordinary plastic film.