摘要
为探究稻虾共作体系中不同龙虾品种和养殖密度对稻田温室气体排放的影响,本研究通过设置不同龙虾品种和养殖密度试验,采取密闭静态箱-气相色谱法研究稻虾共作对温室气体排放规律、排放量及综合增温潜势(GWP)的影响。结果表明:在整个稻虾共作期间,各处理CH_(4)和N_(2)O排放规律基本一致,均在拔节期出现排放高峰;CH_(4)累积排放量表现为DZ(水稻单作)>DA(水稻澳龙共作)>DD(水稻低密度克氏原螯虾共作)>DG(水稻高密度克氏原螯虾共作),而N_(2)O累积排放量表现为DG>DD>DA>DZ;GWP表现为DZ>DA>DD>DG,与DZ处理相比,DG、DD和DA处理GWP分别降低36.9%、30.7%和18.1%。土壤氧化还原电位、水体溶解氧、铵态氮、硝态氮与CH_(4)排放呈显著负相关(P<0.05),与N_(2)O排放呈显著正相关(P<0.05)。研究表明,稻虾共作降低稻田CH_(4)排放,增加N_(2)O排放,减少GWP,其中DG处理减缓GWP效果最好。在稻虾共作体系中,为了更有效降低稻田系统中温室气体的排放,需要考虑龙虾品种和养殖密度的选择。
To explore the effects of different lobster species and breeding density on greenhouse gas(GHG)emissions in rice shrimp cocropping system.In this study,the effects of rice shrimp co-cropping on fluxes of CH_(4),N_(2)O,and global warming potential(GWP)were studied using the closed static chamber method.The results indicated that seasonal patterns of CH_(4) and N_(2)O fluxes were similar in each treatment,e.g.,rice monoculture(DZ),rice co-cropping with Cherax quadricarinatus(DA),rice co-cropping with low-density Procambarus clarkii(DD),and rice co-cropping with high-density Procambarus clarkii(DG).The CH_(4) and N_(2)O fluxes peaked in the jointing stage.The cumulative CH_(4) emissions were in order of DZ>DA>DD>DG.The cumulative N_(2)O emission followed the order of DG>DD>DA>DZ.Compared with DZ,the GWP in DG,DD,and DA treatments decreased by 36.9%,30.7%,and 18.1%,respectively.Soil Eh as well as concentrations of dissolved oxygen,ammonium,and nitrate were negatively correlated with CH_(4) emissions(P<0.05),but positively correlated with N_(2)O emissions(P<0.05).Rice and shrimp co-cropping reduced CH_(4) emissions,increased N_(2)O emissions,and decreased GWP.Moreover,the DG treatment was most effective in reducing GWP.The selection of lobster species and breeding density within a riceshrimp co-cropping system should be considered to reduce greenhouse gas emissions more effectively in a paddy field system.
作者
罗加伟
钱开国
徐博
李虹颖
刘少君
熊启中
李硕
孙瑞波
张朝春
叶新新
LUO Jiawei;QIAN Kaiguo;XU Bo;LI Hongying;LIU Shaojun;XIONG Qizhong;LI Shuo;SUN Ruibo;ZHANG Chaochun;YE Xinxin(College of Resources and Environment,Anhui Agricultural University/Anhui Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green phosphorus Fertilizer/Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/Key Laboratory of Jianghuai Arable Land Resources Protection and Eco-restoration,Hefei 230036,China;Institute of Soil and Fertilizer,Anhui Academy of Agricultural Sciences,Hefei 230001,China;National Agricultural Technology Extension Service Center,Beijing 100125,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2023年第8期1852-1859,共8页
Journal of Agro-Environment Science
基金
安徽省教育厅重点项目(2022AH050886)
安徽省科技重大专项(202103a06020012)
安徽省杰出青年科学基金项目(2008085J13)。
关键词
稻虾共作
温室气体
综合增温潜势
养殖密度
rice-shrimp co-cropping
greenhouse gases
global warming potential
breeding density
