保护性耕作对旱作农田干湿交替过程中土壤呼吸速率的影响

doi:10.3864/j.issn.0578-1752.2017.24.009

Abstract

Abstract: 【Objective】This study was conducted to investigate the effects of conservation tillage practices on soil respiration during drying and wetting period in dry farmland. 【Method】A long-term conservation tillage experiment was carried out at the Qingyang Experimental Station of Lanzhou University. The experiment had four treatments: conventional tillage (T), conventional tillage with stubble retention (TS), no-till without stubble retention (NT) and no-till (NTS). Soil respiration rate was measured continuously with LI-8100 automated soil respiration system during the common vetch growing season from July 7 to August 20 in the 2014. 【Result】The mean soil respiration rates of T, TS, NT and NTS during the drying period were 2.16, 3.56, 2.26 and 2.45 µmol·m^-2·s^-1, respectively, and the corresponding values during the wetting period were 2.09, 5.31, 2.80 and 3.56 µmol·m^-2·s^-1, respectively. Diurnal patterns of soil respiration after the heavy rainfall event were different among the four tillage practices. Soil respiration was positively related to soil water content and negatively related to soil temperature during the drying period, but had an opposite relationship with these parameters after the rewetting. The sensitivity of soil respiration to soil temperature (Q₁₀) reduced by no-till and stubble retention practices. During the wetting period, the Q₁₀values of T, TS, NT and NTS were 1.37, 1.24, 1.31 and 1.25, respectively, and dropped to less than 1.0 for all treatments during the dry period. 【Conclusion】No-till has the potential to release less CO₂. Residue retention buffers soil temperature and soil water content fluctuations, and reduces the Q₁₀ value. Our results also illustrated that it is fairly important to consider the short-term changes of soil respiration during the drying-wetting cycles when modeling the relationship between soil respiration and its influencing factors.

Key words: no-till, stubble retention, soil respiration, drying-wetting cycle, dry farmland

DING XinYu, WANG ZiKui, YANG Xuan, DU ShanShan, SHEN YuYing. Response of Dry Land Soil Respiration to Conservation Tillage Practices During Drying-Wetting Cycles[J].Scientia Agricultura Sinica, 2017, 50(24): 4759-4768.

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