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Promotion effects of salt-alkali on ammonia volatilization in a coastal soil

Pedosphere 2024年第1期34卷 191-199页

作者： Zhenqi SHI Dongli SHE Yongchun PAn Yongqiu XIA College of Agricultural Science and Engineering Hohai UniversityNanjing 210098China Jiangsu Province Engineering Research Center for Agricultural Soil-Water Efficient Utilization Carbon Sequestration and Emission ReductionNanjing 210098China Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China

Coastal ecosystems are highly susceptible to salt-related problems due to their formation process and geographical location. As such ecosystems are the most accessible land resources on Earth, clarifying and quantifying the effects of salt-alkali conditions on n concentration and ammonia(nH_(3)) volatilization are pivotal for promoting coastal agricultural productivity. The challenge in establishing this effect is to determine how salt-alkali conditions impact nH_(3) volatilization through direct or indirect interactions. An incubation experiment using a coastal soil from a paddy farmland, combined with the structural equation modeling(SEM) method, was conducted to reveal the net effects of salt-alkali on nH_(3) volatilization and the role of environmental and microbial factors in mutual interaction networks. The specific experimental design consisted of four salt treatments(S1, S2, S3, and S4: 1‰, 3‰, 8‰, and 15‰ naCl by mass of soil, respectively), four alkaline treatments(A1, A2, A3, and A4: 0.5‰, 1‰, 3‰, and 8‰ naHCO_(3)by mass of soil, respectively) and a control without naCl or naHCO_(3) addition(CK), and each treatment had three urea concentrations(n1, n2, and n3: 0.05, 0.10, and 0.15 g n kg^(-1) soil,respectively) and three replicates. At the n1, n2, and n3 levels, nH_(3)volatilization increased by 9.31%–34.98%, 3.07%–26.92%, and 2.99%–43.61% as the naCl concentration increased from 1‰ to 15‰, respectively, compared with CK. With an increase in the naHCO_(3)concentration from 0.5‰ to 8‰, nH_(3) volatilization increased by 8.36%–56.46%, 5.49%–30.10%, and 30.72%–73.18% at the n1, n2, and n3 levels, respectively, compared with CK. According to the SEM method, salinity and alkalinity had positive direct effects on nH_(3)volatilization, with standardized path coefficients of 0.40 and 0.19, respectively.Considering the total effects(net positive and negative effects) in the SEM results, alkalinity had a greater influence than salinity(total standardized coefficient0.104 > 0.086). nitrogen concentrations in the

关键词： alkalinity coastal ecosystem nH_(3)emission n-transforming microbe salinity structural equation modeling

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