Effects of Root, Stem and Leaf of Maize Enriched by 13C on Brown Earth's Respiration and Their Priming Effects Under Long-term Fertilization Conditions

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    【Objective】 Due to the differences in carbon chemical components among maize residue s(root, stem and leaf), their return to cropland soils with different fertility levels will induce differences in soil respiration and priming.【Method】 In order to explore these differences in the field, a 540-day in-situ field experiment with eight treatments of low fertilizer soil(LF+CK), low fertilizer soil + root (LF + R), low fertilizer soil + stem (LF + S), low fertilizer soil + leaf (LF + L), high fertilizer soil (HF+CK), high fertilizer soil + root (HF + R), high fertilizer soil + stem (HF + S) and high fertilizer soil + leaf (HF + L), was carried out at a long-term positioning station of brown earth in Shenyang Agricultural University using 13C labeled maize straw tracing method.【Result】 Results showed that (1) the contribution rates of soil respiration flux and straw carbon to soil CO2-C emission showed downward trends over the in-situ incubation period. (2) Compared to the treatment without straw, the cumulative CO2-C released from low fertility soil with root, stem and leaf increased by 134%, 126% and 95%, respectively, while that from high fertility soil increased by 157%, 189% and 96%, respectively. (3) The contributions of root and stem to soil CO2-C emission in high fertility soil were significantly greater than that of leaf, but there was no difference in low fertility soil. (4) Different parts of maize straw returning to the field could cause the positive priming effects in both high and low fertility soils. Meanwhile, the priming effects of adding root and stem were significantly stronger than that of adding leaf, showing root and stem would cause more positive priming effects of soil CO2-C than the leaf. Moreover, there was no significant effect on the priming effect between straw parts and soil fertility.【Conclusion】 Overall, this study enriched the theory of cropland soil respiration induced by straw returning, suggesting that the interaction of straw parts and soil fertility on soil respiration should be considered in straw returning.

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YU Yaxi, PEI Jiubo, LIU Wei, WANG Mengmeng, YIN Sijia. Effects of Root, Stem and Leaf of Maize Enriched by 13C on Brown Earth's Respiration and Their Priming Effects Under Long-term Fertilization Conditions[J]. Acta Pedologica Sinica,2023,60(4):1077-1087.

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  • Received:October 30,2021
  • Revised:May 10,2022
  • Adopted:September 05,2022
  • Online: September 19,2022
  • Published: July 28,2023