南京市郊区集约化大棚蔬菜地N_2O的排放  

N_2O emission from an intensively managed greenhouse vegetable field in Nanjing suburb,Jiangsu Province of East China

作　　者：贾俊香[1,2] 张曼[1] 熊正琴[1] 李叶[1] 

机构地区：[1]南京农业大学资源与环境科学学院/江苏省低碳农业与温室气体减排重点实验室,南京210095 [2]山西农业大学资源与环境学院,山西太谷030801

出　　处：《应用生态学报》2012年第3期739-744,共6页Chinese Journal of Applied Ecology

基　　金：教育部新世纪人才支持计划项目(NCET-10-0475);国家自然科学基金项目(40971139;41171238);公益性行业农业科研专项(200903003);中央高校基本科研业务费专项(KYZ201110)资助

摘　　要：采用静态暗箱-气相色谱法,研究了南京市郊区集约化生产管理下,芹菜-空心菜-小白菜-苋菜轮作菜地与休闲裸地的N2O排放通量的动态变化,及其与土壤温度、湿度以及NO3--N和NH4+-N含量的关系.结果表明:轮作菜地的N2O累积排放量达137.2kg N.hm-2,显著大于休闲裸地(29.2 kg N.hm-2);轮作菜地生态系统N2O-N的排放系数高达4.6%.4种蔬菜地中,空心菜地对轮作菜地的周年累积排放量贡献最大,为53.5%,小白菜地次之,为31.9%,芹菜地和苋菜地最小,分别为4.5%和4.8%.轮作菜地的N2O排放通量与土壤温度呈显著正相关,Q10为2.80;土壤湿度以及NO3--N和NH4+-N含量与轮作菜地的N2O排放通量之间的相关性不显著.By using static opaque chamber and gas chromatography,this paper studied the dynamic changes of N2O fluxes and their relationships with soil temperature,soil moisture content,and soil nitrate and ammonium contents in an intensively managed greenhouse celery-Tung choy-Bok choy-amaranth rotation field and in a bare fallow land in Nanjing suburb.The cumulative N2O emission from the rotation vegetable field was as high as 137.2 kg N·hm-2,being significantly higher than that from the bare fallow land（29.2 kg N·hm-2）,and the N2O-N emission factor of the rotation vegetable field ecosystem was up to 4.6%.In the rotation field,the planting of Tung choy had the greatest contribution to the annual cumulative N2O emission,occupying 53.5% of the total,followed by the planting of Bok choy（31.9%）,celery field（4.5%）,and amaranth（4.8%）.The N2O flux of the rotation field had significant positive correlation with soil temperature,the Q10 being 2.80,but no significant correlations with soil moisture content and soil nitrate and ammonium contents.

关 键 词：蔬菜地 N2O 排放系数 Q10 

分 类 号：S626[农业科学—园艺学]