摘要
在浙江省嘉善县选取1.3 hm^(2)稻田,设置节水旱管+秸秆还田/不还田与普通淹灌+秸秆还田/不还田2种种植模式4个处理组(以下简称节水还田、节水不还田、普通还田、普通不还田),采用静态箱-气相色谱法获取28批次336个稻田甲烷(CH_(4))和氧化亚氮(N_(2)O)排放数据,同时结合土壤颗粒有机碳(POC)等6个环境因子12个样品分析结果,探究种植模式协同秸秆管理对稻田温室气体排放特征的影响。结果显示:1)CH_(4)累计排放量依次为普通还田>普通不还田>节水还田>节水不还田,N_(2)O累计排放量为普通还田>节水不还田>节水还田>普通不还田。全球增温潜势(GWP)与温室气体排放强度(GHGI),普通还田最高,分别为7696.03 kg/hm^(2)(以CO_(2)计,全文同)、0.97 kg/kg;节水不还田最低,分别为2110.12 kg/hm^(2)、0.21 kg/kg。2)最小显著差异法分析结果表明,各处理组之间CH_(4)累计排放量存在显著差异。据Pearson相关性分析结果,CH_(4)累计排放量与POC含量呈极显著正相关(P<0.01),与微生物碳含量呈显著正相关(P<0.05);N_(2)O累计排放量则与硝态氮(NO_(3)^(-)-N)含量呈显著正相关(P<0.05),GWP、GHGI与POC含量呈极显著正相关(P<0.01)。3)种植模式与秸秆管理均对CH_(4)累计排放量有极显著影响(P<0.01),二者交互作用对CH_(4)累计排放量、N_(2)O累计排放量有显著影响(P<0.05)。研究表明,水稻节水旱管种植协同秸秆还田措施是一种气候友好型的高产经济种植模式,既可保证粮食安全,降低秸秆离田成本,对于减缓全球温室效应也具有积极作用。
A 1.3 hm^(2) paddy field was selected in Jiashan County,Zhejiang Province,and four treatment groups,briefly referred to as water-saving irrigation,water-saving non-returning,ordinary returning,and ordinary nonreturning,were set up with two planting modes,namely water-saving drought pipe+straw returning/non-returning and ordinary inundation irrigation+straw returning/non-returning.The methane(CH_(4))and nitrous oxide(N_(2)O)emission data from 336 rice fields in 28 batches obtained by static box gas chromatography,in combination with the analysis results of 12 samples of 6 environmental factors,including soil particulate organic carbon(POC),were used to explore the influence of planting mode and straw management on greenhouse gas emission characteristics of rice fields.The results showed as follows:(1)The cumulative CH_(4) emissions were in the order of ordinary returning>ordinary non-returning>water-saving returning>water-saving non-returning,and the cumulative N_(2)O emissions were in the order of ordinary returning>water-saving non-returning>water-saving returning>ordinary nonreturning.The global warming potential(GWP)and greenhouse gas emission intensity(GHGI)of ordinary returning group were the highest,being 7696.03 kg/hm^(2)(calculated as CO_(2))and 0.97 kg/kg,and those of water-saving non-returning group were the lowest,being 2110.12 kg/hm^(2) and 0.21 kg/kg,respectively.(2)The analysis results of the least significant difference method showed significant differences in cumulative CH_(4) emissions among the treatment groups.According to Pearson correlation analysis,the cumulative CH_(4) emission was extremely significantly positively correlated with POC content(P<0.01)and significantly positively correlated with microbial carbon content(P<0.05).The cumulative emission of N_(2)O was significantly positively correlated with NO_(3)^(-)-N content(P<0.05),and GWP and GHGI were extremely significantly positively correlated with POC content(P<0.01).(3)Both planting mode and straw management had extremely significan
作者
余婷
翟壮
高镜清
蔡文倩
YU Ting;ZHAI Zhuang;GAO Jingqing;CAI Wenqian(College of Ecology and Environment,Zhengzhou University;Technical Centre for Soil,Agriculture and Rural Ecology and Environment,Ministry of Ecology and Environment;Innovation Institute of Carbon Peaking and Carbon Neutrality,TCARE&Jiashan)
出处
《环境工程技术学报》
CAS
CSCD
北大核心
2024年第5期1504-1512,共9页
Journal of Environmental Engineering Technology
基金
生态环境部土壤与农业农村生态环境监管技术中心双碳课题(2024-07)。
关键词
节水旱管
秸秆还田
稻田温室气体
全球增温潜势(GWP)
温室气体排放强度(GHGI)
water-saving drought pipe
returning straw to the field
greenhouse gases in rice field
global warming potential(GWP)
greenhouse gas emission intensity(GHGI)
