摘要
以东北耕作黑土为对象,在25℃和60%最大持水量(WHC)条件下开展为期7 d的室内培养试验,研究了不同施肥处理对东北黑土温室气体排放的短期影响.结果表明,与不施肥对照处理相比,单施氮肥对土壤呼吸释放的CO_2没有影响,而在施用氮肥的基础上配施有机物料使得CO_2排放量提高了一个数量级,氮肥配施秸秆对CO_2排放的促进效果大于氮肥配施猪粪.短期培养时间内施用氮肥对N_2O排放没有显著影响,硝化作用是对照处理和单施氮肥处理土壤排放N_2O的主要过程.与单施氮肥处理相比,氮肥配施猪粪或秸秆显著促进了反硝化过程,使得N_2O排放量提高了两个数量级,氮肥配施秸秆处理的N_2O排放量显著大于氮肥配施猪粪处理.单施氮肥抑制了CH_4的排放,表现为对CH_4的微量吸收,而氮肥配施猪粪或秸秆则显著促进了CH_4的排放.
A 7-day incubation experiment was conducted at 25℃ with 60% water holding capacity（ WHC） to study the short-term effects of different fertilization treatments on the regularity of greenhouse gas emissions from northeast black soil. The results showed that application of chemical N fertilizer had no effect on CO2 emission,as compared with the non-fertilizer control treatment; however,a combined application of N fertilizer with pig manure or straw increased CO2 emissions by one magnitude compared to that of the chemical N fertilizer treatment,with the effect of chemical N fertilizer and straw being more prominent. Nitrification was the main process resulting in N2O emission for the non-fertilizer control and chemical N fertilizer treatments,and the application of chemical N fertilizer had no significant effect on N2O emission,as compared with the non-fertilizer control. The combined application of N fertilizer with pig manure or straw promoted the occurrence of denitrification and increased N2O emissions by two magnitudes compared to that of the chemical N fertilizer treatment,with the effect of chemical N fertilizer with straw being more remarkable. Compared with the nonfertilizer control,the application of chemical N fertilizer inhibited CH4 emissions and promoted the slightly absorption of CH4,while the combined application of chemical N fertilizer with pig manure or straw increased significantly the emission of CH4.
作者
李平
郎漫
李淼
魏玮
李凯凯
LI Ping1,2, LANG Man1,2. , LI Miao2 , WEI Wei2 , LI Kai-kai2(1. Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science ＆ Technology, Nanjing 210044, China; 2. College of Applied Meteorology, Nanjing University of Information Science ＆ Technology, Nanjing 210044, Chin)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2018年第5期2360-2367,共8页
Environmental Science
基金
国家自然科学基金项目(41301345
41101284)
江苏省高等学校大学生创新创业训练计划项目
关键词
施肥
黑土
温室气体
硝化作用
反硝化作用
fertilization
black soil
greenhouse gas
nitrification
denitrification
