中国生态农业学报2016，Vol.24Issue(11)：1456-1463,8.DOI:10.13930/j.cnki.cjea.160405
秸秆还田与施氮对黑土区春玉米田产量、温室气体排放及土壤酶活性的影响
Effects of soil straw return and nitrogen on spring maize yield, greenhouse gas emission and soil enzyme activity in black soils
摘要
Abstract
AbstractNortheast China spring maize production area is among the main maize cultivation regions in China. Due to located in high latitude region and singling cropping system, spring maize fields in black soil region of Northeast China is less reported as for researches on farmland greenhouse effects. It is therefore important to explore the effects of straw return to soil and nitrogen application on maize grain yield and greenhouse gas emissions in the area. In this study, a two-factor straw return (no straw return and straw return) and three-factor nitrogen (N) application (N: 120 kg·hm-2, 240 kg·hm-2 and 300 kg·hm-2) field experiment was conducted in a randomized block design. Total emissions of CO2, N2O and CH4, global warming potential of CO2-eq and greenhouse gas emissions intensity (GHGI), soil catalase and urease activities were determined in the experiment. The results showed that the highest yield was observed in straw return with medium N dose (240 kg·hm-2) treatment, which was not significantly different from that of the highest N dose (300 kg·hm-2) with no straw return treatment (P> 0.05). With increasing N dose, CO2, N2O and CH4 emissions, global warming potential of CO2-eq, and GHGI significantly increased under no straw return conditions. On the other hand, N application with straw return only enhanced CO2 and N2O emissions, while soil CH4carbon sink increased (P< 0.05), and greenhouse gas emissions and intensities (CO2-eq and GHGI) did not increase remarkably (P> 0.05). Under no straw return conditions, N application reduced soil catalase activity and enhanced soil urease activity with increasing N application. However, straw return improved the decreasing range of soil catalase activity, and weakened the increasing range in soil urease activity caused by increased N application. Therefore, straw return with N application enhanced grain yield, with the highest yield under medium N application treatment (N: 240 kg·hm-2). Medium N application with straw return limited greenhouse effects compared with no straw return in the experiment. The results were valuable for the recommendation of N application rates in spring maize cultivation in black soil regions.关键词
黑土/秸秆还田/氮肥/温室气体/土壤酶活性/春玉米Key words
Black soil/Straw return/Nitrogen application/Greenhouse gas/Soil enzyme activity/Spring maize分类
农业科学引用本文复制引用
吕艳杰,于海燕,姚凡云,曹玉军,魏雯雯,王立春,王永军..秸秆还田与施氮对黑土区春玉米田产量、温室气体排放及土壤酶活性的影响[J].中国生态农业学报,2016,24(11):1456-1463,8.基金项目
吉林省自然科学基金项目(20130101090JC)、国家科技支撑计划项目(2013BAD07B02)和吉林省科技发展计划(20150519010JH,2015GJLS005NY)资助* Funded by the Natural Science Foundation of Jilin Province (20130101090JC), the National Key Technology R&D Program of China (2013BAD07B02), and the Science and Technology Development Plan of Jilin Province (20150519010JH,2015GJLS005NY) （20130101090JC）
