外源钙添加对有机物料改良滨海盐碱土固碳潜力的影响

doi:10.11707/j.1001-7488.LYKX20230253

Abstract

Abstract: Objective This study aims to investigate the effects of exogenous calcium addition on soil CO₂ emission and soil carbon pool of organic amendment in improving coastal saline-alkali soil, so as to provide the theoretical basis for the improvement and utilization of coastal saline-alkali soil and the enhancement of carbon sequestration potential. Method In an indoor incubation experiment, the corn straw biochar + chicken manure (BM), and rice straw + chicken manure (SM) were respectively applied to the coastal saline-alkali soil. Calcium hydroxide and calcium silicate were used as calcium sources. Six treatments were established according to the principle of equal calcium content: no exogenous calcium application (CK), 12.4 g·kg^?1 calcium silicate application (Ca1), 24.8 g·kg^?1 calcium silicate application (Ca2), 7.9 g·kg^?1 calcium hydroxide application (Ca3), 15.8 g·kg^?1 calcium hydroxide application (Ca4), 12.4 g·kg^?1 calcium silicate and 7.9 g·kg^?1 calcium hydroxide application (Ca5). All the calcium concentrations were added to the soil, and the incubation experiment lasted for one month. Result The results showed that the addition of exogenous calcium significantly reduced cumulative CO₂ emission during the incubation period. The application of organic amendments led to the loss of SOC (soil organic carbon), while exogenous calcium addition did not significantly affect SOC mineralization but significantly increased SIC (soil inorganic carbon) content, thereby compensating for the loss of SOC and increasing the total carbon content in the soil, achieving the goal of soil carbon sequestration. Proper increase in the amount of calcium hydroxide was able to promote carbon sequestration. The emission reduction was mainly achieved by increasing the absorption of CO₂ produced during mineralization and converting it into the form of calcium carbonate for fixation. Conclusion The above results indicate that the combination of organic amendments with calcium silicate and calcium hydroxide can effectively achieve soil carbon sequestration and emission reduction during the improvement of saline-alkali soil.

Key words: saline-alkali soil, CO₂, soil carbon sequestration, soil inorganic carbon

CLC Number:

S156.4⁺2

Shi Wenzhu, Sun Xi, Shao Xusheng, Re Yousuomu, Wang Genmei, Zhang Huanchao, Xiang Jian. Effects of Exogenous Calcium Addition on Soil Carbon Sequestration Potential of Organic Amendments in Improving Coastal Saline-Alkali Soil[J]. Scientia Silvae Sinicae, 2024, 60(2): 32-41.

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Effects of Exogenous Calcium Addition on Soil Carbon Sequestration Potential of Organic Amendments in Improving Coastal Saline-Alkali Soil

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