不同外源有机碳对稻田甲烷排放和易氧化有机碳的影响  

Effects of Applications of Exogenous Organic Carbon on Methane Emissions and Oxidizable Organic Carbon in Paddy Soil

作　　者：霍莲杰[1,2,3] 纪雄辉[2,3] 吴家梅[1,2,3] 彭华[2,3] 朱坚[1,2,3] 

机构地区：[1]中南大学研究生院隆平分院,湖南长沙410125 [2]湖南省土壤肥料研究所,湖南长沙410125 [3]农业部长江中游平原农业环境重点实验室,湖南长沙410125

出　　处：《农业现代化研究》2013年第4期496-501,共6页Research of Agricultural Modernization

基　　金：国家科技支撑项目"稻田生态系统固碳减排技术集成与示范"(编号:2013BAD11B02);中南大学学位论文创新资助项目(编号:2011ssxt124)

摘　　要：本文以猪粪、鸡粪和稻草等外源有机碳与水稻土混合淹水培养,监测其甲烷排放动态,并采用高锰酸钾氧化法进行易氧化有机碳分组,研究其甲烷排放、土壤易氧化有机碳组分之间的动态相关性,旨在弄清土壤易氧化有机碳组分之间的相互转化关系及其与甲烷排放的关系。结果表明,稻田土壤与外源有机碳混合淹水培养极显著增加了CH4排放,其中,土+稻草处理的CH4排放量(178.8 kg/hm2)较对照(纯土处理)增加达265.2%(P<0.01),土+鸡粪处理和土+猪粪处理分别增加了127.3%(P<0.01)和95.3%(P<0.01);外源有机碳的添加增加了土壤中易氧化有机碳AOC3.33、AOC16.7-3.33、AOC33-16.7和AOC167-33的含量,且土壤极易氧化有机碳AOC3.33和AOC16.7-3.33关联性较强,且总体上分别与CH4排放通量呈极显著动态相关(P<0.01);有机碳AOC33-16.7和AOC167-33之间,以及分别与AOC3.33、AOC16.7-3.33、CH4排放通量之间动态相关性较差。可见,淹水条件下易氧化有机碳AOC3.33和AOC16.7-3.33极显著影响稻田土壤CH4排放。In order to find out the mutual transformation relationship of soil oxidizable organic carbon fraction and its relationship with methane emission, an incubation experiment was designed to monitor the dynamic of methane emission, analysis the oxidizable organic carbon fraction using potassium permanganate （KMnO4） procedure and study the dynamic relevance of methane emission and oxidizable organic carbon fraction after applications of pig manure, chicken manure and rice straw in flooded paddy soil. The results showed that, soil methane accumulation emission fluxes increased significantly after applications of exogenous organic carbon, methane accumulation emission fluxes of the treatment of soil ＋ rice straw （178.8 kg/hm2 was 265.2% （P〈0.01） highly than that of the treatment of single soil. The treatment of soil ＋ chicken manure and soil ＋ pig manure respectively increased 127.3% （P〈0.01） and 95.3% （P〈0.01）. After applications of exogenous organic carbon, the content of soil oxidizable organic carbon （AOC3.33,AOC16.7-3.33, AOC33-16.7 and AOC167.33） also increased. Besides, AOC3.33 and AOC16.7-3.33 as high-activity soil organic carbon had a strong correlation, and respectively had extremely significant correlations with methane emission fluxes （P〈0.01）. AOC33-16.7 had no correlation with other active organic carbon fraction and methane emission fluxes, as well as AOC16.7-33. The conclusions indicate that soil oxidizable organic carbon AOC3.33 and AOC167-3.33 significantly influence methane emission from flooded paddy soil.

关 键 词：甲烷 土壤 外源有机碳 易氧化有机碳 淹水培养 

分 类 号：S141[农业科学—肥料学] S153.6[农业科学—农业基础科学]