山西农业大学学报（自然科学版）2025，Vol.45Issue(5)：87-99,13.DOI:10.13842/j.cnki.issn1671-8151.202505031
腐熟剂适宜用量显著提高秸秆腐解率并降低麦玉轮作农田周年温室气体排放
Optimizing decomposer application to enhance straw decomposition and mitigate greenhouse gas emis-sions in a wheat-maize rotation system
摘要
Abstract
[Objective]Long-term straw incorporation can lead to impaired soil structure and environmental risks due to slow de-composition.This study,conducted on the Guanzhong Plain in a winter wheat-summer maize rotation system,investigated the effects of different decomposer application rates on straw decomposition and greenhouse gas emissions,with the goal of identify-ing a strategy that enhances crop yield while reducing greenhouse gas emission.[Methods]A field experiment was conducted in the Yangling Demonstration Zone,Shaanxi Province from 2020 to 2021.A single-factor,completely randomized block design was employed with four decomposer application rates:30 kg/hm2(T1),45 kg/hm2(T2),60 kg/hm2(T3),and 75 kg/hm2(T4),alongside a control with no decomposer(CK).Annual GHG fluxes were monitored to determine their cumulative emis-sions and global warming potential.[Results]At 30,90,120,and 360 days after incorporation,the straw decomposition rate under T2 was 30.66%,10.68%,6.95%and 3.21%higher than CK,respectively,with the increases at 30 and 90 days being statistically significant.The soil was a net source for CO2 and N2O emissions and a net sink for CH4.Decomposer application significantly regulated GHG flux.Compared to CK,the T3 treatment significantly reduced cumulative annual CO2 and N2O emissions and doubled the cumulative CH4 uptake.Decomposer application also significantly affected the annual global warm-ing potential(GWP)of the system.The GWP across treatments ranked as T4>T1>T2>CK>T3,with significant differ-ences(p<0.05).The T3 treatment resulted in the lowest annual GWP(1 833.2 kgCO2-eq/hm2),while T2 produced a GWP of 2 107.01 kgCO2-eq/hm2 with a GHG emission intensity of 0.11 kgCO2-eq/hm2.Crop yields were also significantly influ-enced.T2 yielded the highest summer maize(12 293.78 kg/hm2)and winter wheat(7 318.50 kg/hm2)production,resulting in the highest total yield.[Conclusion]In summary,straw incorporation combined with a decomposer at 45 kg/hm2(T2)accel-erated straw decomposition,significantly reduced annual GHG emissions,and optimized crop yields.This approach effectively balances environmental benefits with economic viability.关键词
腐熟剂/秸秆还田/温室气体/腐解特征/作物产量Key words
Decomposer/Straw incorporation/Greenhouse gases/Decomposition characteristics/Crop yield分类
农业科学引用本文复制引用
白延倩,肖金宝,李会,韩清芳,贾志宽,刘铁宁..腐熟剂适宜用量显著提高秸秆腐解率并降低麦玉轮作农田周年温室气体排放[J].山西农业大学学报（自然科学版）,2025,45(5):87-99,13.基金项目
国家自然科学基金(31601256) （31601256）
中国博士后科学基金(2016M602869) （2016M602869）
