摘要
采用田间试验,施用2种城市污泥堆肥(含生物质炭和不含生物质炭),通过静态暗箱-气相色谱法研究污泥堆肥土地利用过程温室气体排放特征,探讨施用污泥堆肥的短期影响作用.结果表明,在观测时间内,N_2O排放主要集中在前3周,约占总排放量的87.9%~95.6%.N_2O排放量均随污泥堆肥施用量的增加而增加(P<0.05),裸地N_2O排放量高于种植作物处理.施用含生物质炭污泥堆肥能减少土壤N_2O排放,且随着施用量的增加,N_2O减少量越大(P<0.05).CH_4排放量较低,在试验前期和后期主要为负,总体表现为吸收CH_4.各处理吸收CH_4主要集中在第18d以后,其CH_4吸收量占总吸收量的52.1%~66.7%.施用含生物质炭污泥堆肥处理CH_4吸收量比不含生物质炭污泥堆肥处理低35.2%~62.2%,同时,裸地CH_4吸收量明显高于种植作物处理(P<0.05).CO_2排放也主要集中在18d以后,约占排放总量的50.5%~61.8%.种植作物能促进CO_2的排放,种植作物处理是裸地的1.34~1.57倍.在观测时间内,污泥堆肥土地利用是CH_4的弱吸收汇,是N_2O和CO_2的排放源,施加污泥堆肥能显著增加土壤N_2O和CO_2的排放.施用生物质炭污泥堆肥短期内能够减少温室气体总排放量,温室气体减排量达到20.41%~62.51%.
Two different sewage sludge composting products(with and without biochar)were applied in field to study short-term impacts of their application on the greenhouse gases(CH4,CO2 and N2O)emission from soil.The results indicated that N2O emissions mainly occurred in the first three weeks,with the emission amount accounting for 87.9%~95.6%of the total emissions during the observation period.The emission amount of N2O increased with the application amount of compost(P<0.05),and N2O emission from bare land was higher than that of crop plants treatment.The application of sludge composting can lead to the reduction of the N2O emissions from soil,and the N2O reduction amount increased with the increase of the fertilizing amount(P<0.05).CH4 emission fluxes showed negative values in the early and late stages of the experiment,indicating that soil could adsorb CH4.The absorption of CH4 took place mainly after 18 days,accounting for 52.1%~66.7%of the total absorping amounts.The absorping amount of CH4 in soil with biochar compost was 35.2%to 62.2%less than that in soil without biochar,and higher absorping amount of CH4 appeared in bare land when compared with the land with planting crops(P<0.05).CO2 emissions mainly occurred after 18days,accounting for 50.5%~61.8%of the total emission.The planting crops can promote the CO2 emission in soil,which was 1.34~1.57 times that of the bare land.Thus,it can be speculated that land application of compost was a weak sink of CH4 and a source of N2O and CO2 emissions during the observation period.The application of sludge composting can lead to the increase of the emissions of N2O and CO2 in soil.Sludge compost with biochar in short-term could reduce the N2O and CO2 emissions from soil,and the biochar played an important role in reducing the greenhouse gas emissions,as the emission amounts from soil with biochar compost was 20.41%to 62.51%less than that in soil without biochar.
作者
蒋越
周楫
杨雨浛
陈宏
张成
JIANG yue;ZHOU Ji;YANG Yu-han;CHEN Hong;ZHANG Cheng(College of Resources and Environment,Southwest University,Chongqing 400715,China;Chongqing Key Laboratory of Agricultural Resources and Environment,Chongqing 400715,China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第10期3788-3794,共7页
China Environmental Science
基金
国家自然科学基金资助项目(51208426)
关键词
污泥堆肥
土地利用
温室气体
排放特征
短期效应
sludge compost
land application
greenhouse gas
emission characteristics
short-term effect
