首页 | 本学科首页   官方微博 | 高级检索  
     

不同施氮水平对农田黑土净氮转化速率和温室气体排放的影响
引用本文:郎漫,袁晓航,李平. 不同施氮水平对农田黑土净氮转化速率和温室气体排放的影响[J]. 中国农学通报, 2022, 38(31): 93-100. DOI: 10.11924/j.issn.1000-6850.casb2021-1078
作者姓名:郎漫  袁晓航  李平
作者单位:1.南京信息工程大学江苏省农业气象重点实验室,南京 210044;2.南京信息工程大学应用气象学院,南京 210044;3.南京信息工程大学长望学院,南京 210044
基金项目:中央土壤污染防治资金项目“新沂市受污染耕地安全利用推进区(示范基地);国家自然科学基金项目“结构改良剂对污染水稻土重金属形态和有效性的影响机理”(41301345);“耕作和施肥对黑土氮初级转化速率的影响及其环境效应”(41101284)
摘    要:探讨不同施氮水平对农田黑土氮素转化和温室气体排放的影响,以期为农田合理施肥提供科学指导。以黑龙江省农田黑土为对象,采用室内培养试验,研究土壤净氮矿化速率、净硝化速率、N2O和CO2排放速率及累积排放量对不同施氮水平[0 mg N/kg (N0)、40 mg N/kg (N40)、60 mg N/kg(N60)、80 mg N/kg (N80)]的响应。结果表明,不施氮的N0处理土壤净氮矿化速率为0.03 mg N/(kg·d),而N40、N60和N80处理土壤净氮矿化速率分别为-0.71、-1.01、-1.27 mg N/(kg·d),均表现为对氮的净固定。施氮显著促进了土壤硝化作用,N0处理土壤净硝化速率为0.32 mg N/(kg·d),而N40、N60和N80处理土壤净硝化速率分别为N0处理的15.2、19.7、24.0倍。在0~60 mg N/kg施氮水平内,土壤N2O排放速率随施氮水平的增加而显著增加,施氮水平增加至80 mg N/kg时,N2O排放速率反而显著低于N60处理。N0处理的N...

关 键 词:氮肥  黑土  矿化  硝化  N2O  CO2
收稿时间:2021-11-09

Effects of Different Nitrogen Application Levels on Net Nitrogen Transformation Rate and Greenhouse Gas Emission in Cropland Black Soil
LANG Man,YUAN Xiaohang,LI Ping. Effects of Different Nitrogen Application Levels on Net Nitrogen Transformation Rate and Greenhouse Gas Emission in Cropland Black Soil[J]. Chinese Agricultural Science Bulletin, 2022, 38(31): 93-100. DOI: 10.11924/j.issn.1000-6850.casb2021-1078
Authors:LANG Man  YUAN Xiaohang  LI Ping
Affiliation:1.Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044;2.School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044;3.School of Changwang, Nanjing University of Information Science & Technology, Nanjing 210044
Abstract:The study aims to understand the effects of different nitrogen (N) application levels on N transformation and greenhouse gas emissions in cropland black soil, and provide scientific guidance for rational fertilization in cropland. Cropland black soil in Heilongjiang Province was selected to study the responses of net N mineralization rate, net nitrification rate, N2O and CO2 emission rates and cumulative emissions to different N application levels [0 (N0), 40 (N40), 60 (N60) and 80 (N80) mg N/kg] through a laboratory incubation experiment. The results showed that the net N mineralization rate of N0 treatment was 0.03 mg N/(kg·d), while that of N40, N60 and N80 treatments was -0.71, -1.01 and -1.27 mg N/(kg·d), respectively, which indicated the occurrence of net N immobilization in the three treatments. Nitrogen application significantly promoted nitrification in soil, soil net nitrification rate of N0 treatment was 0.32 mg N/(kg·d), while that of N40, N60 and N80 treatments was 15.2, 19.7 and 24.0 times that of N0 treatment, respectively. The N2O emission rate increased significantly with the increase of N application level within 0-60 mg N/kg, however, when the N application level increased to 80 mg N/kg, N2O emission rate was significantly lower than that of N60 treatment. The N2O emission ratio of N0 treatment was 8.11‰, N application significantly decreased the ratio to 1.48‰, 1.72‰ and 1.15‰ under N40, N60, and N80 treatments, respectively, and no significant difference among the three N application rates was observed. Compared with N0 treatment, N application significantly inhibited CO2 emission, whereas, CO2 cumulative emission was not affected by N application level. This study show that N application level significantly affect soil net N transformation rate and greenhouse gas emissions, and the results are of practical significance for deeply understanding the N transformation regularity in cropland black soil and the rational application of N fertilizer.
Keywords:nitrogen fertilizer  black soil  mineralization  nitrification  N2O  CO2  
点击此处可从《中国农学通报》浏览原始摘要信息
点击此处可从《中国农学通报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号