The effects of aeration and irrigation regimes on soil CO2 and N2O emissions in a greenhouse tomato production system

Irrigation Combined with Aeration Promoted Soil Respiration through Increasing Soil Microbes, Enzymes, and Crop Growth in Tomato Fields

“…As for soil temperature, a total decreasing trend was found throughout the whole tomato growing period except for a general increase between 35 to 49 DAT, between 70 to 83 DAT, as well as between 133 to 141 DAT (Figure 1d-f), which coincided with the seasonal patterns of air temperature. WFPS and soil temperature under aeration and high irrigation level were higher than the control and low irrigation level most of the time, which were in accordance with the findings of a previous study [9]. However, analysis of variance indicated that the effects of irrigation, aeration, and their interaction on mean WFPS and soil temperature were not significant (Table 1, p > 0.05).…”

“…Soil microbial abundance (especially for cfub and cfuf, Figure 2) peaked when soil hydrothermal conditions were good ( Figure 1) and crops were growing vigorously on 98 DAT. Peaks of cfua during the early tomato growing period (on 35 DAT) were probably ascribed to the highest WFPS (64.5%-67.7%) and greater soil temperature (23.1-24.7 °C), as well as greater soil substrates resulted from base fertilizer application [9]. Compared with the control, aeration under each irrigation level slightly increased mean values of cfub, cfuf, and cfua ( Table 1, p > 0.05), with average increases of 4.6%, 5.5%, and 3.4%, respectively.…”

“…Previously, studies on drivers of soil respiration have been largely conducted on soil water content, temperature, and the interaction of these two parameters [9,[11][12][13][14]. For AI treatment, a close correlation between soil CO 2 fluxes with soil water content and temperature has been confirmed [9,10]. Soil microbes and enzymes as biocatalysts for all biochemical reactions in the soil would decompose and Table 1.…”

“…Soil respiration, originating primarily from heterotrophic respiration and autotrophic respiration [7,8], is a principal component in the global carbon cycle. A few studies have reported an increase of soil respiration under AI [6,9,10], while the cause of CO 2 release needs to be further explored. Previously, studies on drivers of soil respiration have been largely conducted on soil water content, temperature, and the interaction of these two parameters [9,[11][12][13][14].…”

“…A few studies have reported an increase of soil respiration under AI [6,9,10], while the cause of CO 2 release needs to be further explored. Previously, studies on drivers of soil respiration have been largely conducted on soil water content, temperature, and the interaction of these two parameters [9,[11][12][13][14]. For AI treatment, a close correlation between soil CO 2 fluxes with soil water content and temperature has been confirmed [9,10].…”