汪婧, 蔡立群, 张仁陟, 王友玲, 董稳军. 耕作措施对温带半干旱地区土壤温室气体(CO2、CH4、N2O)通量的影响[J]. 中国生态农业学报(中英文), 2011, 19(6): 1295-1300. DOI: 10.3724/SP.J.1011.2011.01295
引用本文: 汪婧, 蔡立群, 张仁陟, 王友玲, 董稳军. 耕作措施对温带半干旱地区土壤温室气体(CO2、CH4、N2O)通量的影响[J]. 中国生态农业学报(中英文), 2011, 19(6): 1295-1300. DOI: 10.3724/SP.J.1011.2011.01295
WANG Jing, CAI Li-Qun, ZHANG Ren-Zhi, WANG You-Ling, DONG Wen-Jun. Effect of tillage pattern on soil greenhouse gases (CO2, CH4 and N2O) fluxes in semi-arid temperate regions[J]. Chinese Journal of Eco-Agriculture, 2011, 19(6): 1295-1300. DOI: 10.3724/SP.J.1011.2011.01295
Citation: WANG Jing, CAI Li-Qun, ZHANG Ren-Zhi, WANG You-Ling, DONG Wen-Jun. Effect of tillage pattern on soil greenhouse gases (CO2, CH4 and N2O) fluxes in semi-arid temperate regions[J]. Chinese Journal of Eco-Agriculture, 2011, 19(6): 1295-1300. DOI: 10.3724/SP.J.1011.2011.01295

耕作措施对温带半干旱地区土壤温室气体(CO2、CH4、N2O)通量的影响

Effect of tillage pattern on soil greenhouse gases (CO2, CH4 and N2O) fluxes in semi-arid temperate regions

  • 摘要: 通过设置在甘肃省定西市李家堡镇的不同耕作措施试验, 利用CO2分析仪、静态箱-气相色谱法对双序列轮作次序下春小麦地、豌豆地生育期内CO2、CH4和N2O通量进行了测定。试验结果表明: 4种耕作措施下春小麦地和豌豆地在生育期内均表现为CO2源、N2O源和CH4汇的功能。传统耕作不覆盖、免耕不覆盖、免耕秸秆覆盖和传统耕作结合秸秆还田下, 春小麦生育期内平均土壤CO2通量(μmol·m-2·s-1)分别为0.203 6、0.221 2、0.241 8、0.224 9, CH4通量(mg·m-2·h-1)分别为-0.041 6、-0.078 0、-0.081 8、-0.053 7, N2O通量(mg·m-2·h-1)分别为0.089 1、0.069 2、0.046 1、0.065 6; 豌豆生育期内平均土壤CO2通量(μmol·m-2·s-1)分别为0.273 6、0.261 6、0.218 1、0.236 0, CH4通量(mg·m-2·h-1)分别为-0.055 0、-0.073 7、-0.066 2、-0.054 5, N2O通量(mg·m-2·h-1)分别为0.123 4、0.084 7、0.080 6、0.035 0。少免耕及小麦秸秆覆盖有利于减少土壤CO2排放通量, 免耕不覆盖、免耕秸秆覆盖及传统耕作结合秸秆还田均能不同程度地增加CH4吸收通量、减少N2O排放通量。综合来看, 免耕不覆盖、免耕秸秆覆盖和传统耕作结合秸秆还田3种保护性耕作措施有助于减少土壤温室气体的排放量。春小麦地CO2通量随着土壤温度、土壤含水量的逐渐升高而增大; CH4吸收通量随着土壤含水量的逐渐升高而增大, 而随着土壤温度的逐渐升高而减小。豌豆地CO2通量的变化与土壤含水量存在极显著正相关关系; 而春小麦地N2O通量则与平均土壤温度呈显著正相关, 豌豆地则为极显著正相关。

     

    Abstract: Different tillage methods and crop rotations were experimented in Lijiabao Town of Dingxi City, Gansu Province and soil carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) fluxes measured using carbon dioxide analyzer and static chamber-gas chromatographic techniques. Analysis of the four tillage methods tillage without straw or plastic film mulching (T), no-tillage without straw or plastic film mulching (NT), no-tillage with straw mulching (NTS) and tillage with straw mulching (TS) showed that soils with spring wheat and pea were sources of atmospheric CO2 and N2O, sink of CH4 during crop growth seasons. In spring wheat fields, the mean values of soil CO2 flux (μmol·m-2·s-1) were 0.203 6, 0.221 2, 0.241 8 and 0.224 9 for T, NT, NTS and TS treatments, respectively. The mean values of soil CH4 flux (mg·m-2·h-1) were -0.041 6, -0.078 0, -0.081 8 and -0.053 7 and those of soil N2O flux (mg·m-2·h-1) were 0.089 1, 0.069 2, 0.046 1 and 0.065 6 for T, NT, NTS and TS treatments, respectively. In pea field, the mean values of soil CO2 flux (μmol·m-2·s-1) were 0.273 6, 0.261 6, 0.218 1 and 0.236 0 for T, NT, NTS and TS treatments, respectively. The mean values of soil CH4 flux (mg·m-2·h-1) were -0.055 0, -0.073 7, -0.066 2 and -0.054 5 and those for soil N2O flux (mg·m-2·h-1) were 0.123 4, 0.084 7, 0.080 6 and 0.035 0, respectively. Compared with T, NT and TS, NTS retarded CO2 and N2O emission and enhanced CH4 assimilation. Based on the study, NT, NTS and TS conservation tillage methods were efficient for retarding greenhouse gas emission. CO2 fluxes increased with increasing soil moisture and temperature in spring wheat field, and CH4 uptake fluxes increased with increasing soil moisture, but reduced with increasing soil temperature. A significant positive correlation was noted between CO2 flux and soil moisture in pea field. Similarly, a significant positive correlation was observed between N2O emission and soil temperature in pea and spring wheat fields.

     

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