中国生态农业学报2011，Vol.19Issue(6)：1295-1300,6.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
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 CFL, 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 (mgm"2h"') 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·-1) were 0.123 4, 0.084 7, 0.080 6 and 0.035 0, respectively. Compared with T, NT and TS, NTS retarded CO2and 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.关键词
温带半干旱地区/春小麦/豌豆/轮作/耕作措施/温室气体/排放通量/吸收通量/土壤含水量/土壤温度Key words
Semi-arid temperate region/ Spring wheat/ Pea/ Crop rotation/ Tillage method/ Greenhouse gas/ Emission flux/ Assimilation flux/ Soil moisture/ Soil temperature分类
农业科学引用本文复制引用
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,2011,19(6):1295-1300,6.基金项目
国家自然科学基金项目(31160269)、教育部博士点基金(新教师类)项目(20106202120004)和甘肃省高等学校研究生导师科研计划项目(1002-09)资助 （31160269）
