PJB-2025-9
THE EFFECT OF CORN–SOYBEAN INTERCROPPING ON SOIL RESPIRATION
JINGJING CUI
Abstract
To explore the effects of corn–soybean intercropping on soil CO2 emission and carbon balance, we established three planting methods, namely, maize monoculture (M), soybean monoculture (S), and maize–soybean intercropping (MS). Results showed that the cumulative emissions of soil CO2 were M (21231.11 kg·hm-2) > S (19715.37 kg·hm-2) > MS (17321.97 kg·hm-2). The two-factor composite model of soil temperature and moisture content could explain the variation in soil CO2 emission rate well, which reached 58.36%–68.54%. Correlation analysis showed that the soil CO2 emission rate was significantly correlated with peroxidase activity (P＜0.01). The soil carbon balance was favorable under different treatments, serving as a sink for atmospheric carbon. M treatment exhibited superior soil carbon balance compared with MS and S treatments, with increases of 29.80% and 359.31%, respectively. Therefore, M treatment was a better planting method compared with S and MS treatments.
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