Influence of tillage practice on soil CO2 emission rate and soil characteristics in a dryland wheat field
2013
Liu, Y. (Northwest A and F University, Yangling (China). Coll. of Agronomy) | Yang, L. (Yanan Univ., Yanan (China)) | Gu, D. (Northwest A and F Univ., Yangling (China). Coll. of Plant Protection) | Wu, W. | Wen, X. | Liao, Y.
In the present study, different tillage and straw-returning (SR) practices were evaluated at the Loess Plateau, the largest dryland region of China, to investigate the relationship between CO2 emission and soil temperature, moisture and microbial biomass C (MB-C) in dryland wheat fields under the influence of different tillage and SR practices. The results showed that tillage had significant effects on soil CO2 emissions. Compared with rotary tillage (RT), plough tillage (PT) significantly increased soil CO2 emission rate, and no tillage (NT) significantly decreased the soil CO2 emission rate throughout the wheat growing season. In addition to tillage, SR also significantly affected soil CO2 emissions. With respect to the average soil CO2 emission rate during wheat growing season, PT with SR and NT with SR significantly increased soil CO2 emissions compared with PT and NT, respectively. Moreover, the Soil CO2 emission rate was positively and significantly correlated with soil temperature, and it was negatively and significantly correlated with soil moisture for the different tillage practices. However, no significant correlation was observed between the soil CO2 emission rate and MB-C content. These results indicate that tillage and SR affect soil CO2 emissions by regulating the temperature and moisture of soil.
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