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Abstract <p>Soil CO<sub>2</sub> emission of was measured by the field chamber method in the experiment on application of no-till technology (zero tillage) on chernozemlike soils of the Amur region of Russia, where 30% of the country’s soybeans are grown. One-factor and two-factor models for estimation of soil respiration per year were constructed based on the data of field measurements in 2022–2024. Soil temperature is a reasonably good predictor of emission (<i>R</i><sup>2</sup> = 0.8, <i>p</i> &lt; 0.001), which allows us to use continuous soil temperature series from loggers to calculate seasonal fluxes at a frequency of six times per day. The total annual CO<sub>2</sub> flux from the experimental plot (no-till) was 0.69 t C/ha, or 23.6% lower than the CO<sub>2</sub> flux from the control plot (conventional tillage). The contribution of summer period to the annual flux was 59%. The two-factor <i>T</i>&amp;<i>P</i>-model (temperature and precipitation) showed an overestimation of annual flux by 40%. Application of air temperature from the nearest weather station for modeling gave an underestimation of total flux by 13–20%. The no-till plot showed higher water-soluble carbon (2.5 and 3.8%, <i>p</i> = 0.055) and nitrogen (0.3&#xa0;and 0.6%, <i>p</i> = 0.0025) contents relative to the conventional tillage plot. Switching to no-till technology increased the density of the upper soil horizons by 8–12%, but the density remained within the optimum for soybean. In the no-till plot, the volumetric soil water content was also consistently higher (by 38% on average in the upper 5-cm-thick layer), which was a strategically important advantage because of the frequent periods of moisture deficiency.</p>

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Influence of Direct Seeding Technology on the CO2 Emission by Chernozem-Like Soils of the Amur Region

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • A. V. Ivanov,
  • V. V. Getmanskii,
  • P. V. Tikhonchuk,
  • O. A. Selikhova,
  • A. V. Danilov,
  • O. A. Piletskaya

摘要

Abstract

Soil CO2 emission of was measured by the field chamber method in the experiment on application of no-till technology (zero tillage) on chernozemlike soils of the Amur region of Russia, where 30% of the country’s soybeans are grown. One-factor and two-factor models for estimation of soil respiration per year were constructed based on the data of field measurements in 2022–2024. Soil temperature is a reasonably good predictor of emission (R2 = 0.8, p < 0.001), which allows us to use continuous soil temperature series from loggers to calculate seasonal fluxes at a frequency of six times per day. The total annual CO2 flux from the experimental plot (no-till) was 0.69 t C/ha, or 23.6% lower than the CO2 flux from the control plot (conventional tillage). The contribution of summer period to the annual flux was 59%. The two-factor T&P-model (temperature and precipitation) showed an overestimation of annual flux by 40%. Application of air temperature from the nearest weather station for modeling gave an underestimation of total flux by 13–20%. The no-till plot showed higher water-soluble carbon (2.5 and 3.8%, p = 0.055) and nitrogen (0.3 and 0.6%, p = 0.0025) contents relative to the conventional tillage plot. Switching to no-till technology increased the density of the upper soil horizons by 8–12%, but the density remained within the optimum for soybean. In the no-till plot, the volumetric soil water content was also consistently higher (by 38% on average in the upper 5-cm-thick layer), which was a strategically important advantage because of the frequent periods of moisture deficiency.