数字农科院2.0

Biochar and Soil Water Synergistically Regulating Root Growth to Affect Photosynthesis in Maize (Zea mays L.)

文献类型： 外文期刊

作者： Chao Gao;Jingtao Qin;Yan Tian;Jianbo Yang;Guobing Wang

作者机构：

关键词： drought stress;maize;root density;van Genuchten model;water retention

期刊名称： Agronomy

ISSN： 2073-4395

年卷期： 2025 年 15 卷 9 期

页码：

收录情况： SCIE（2025版）

摘要： In arid/semi-arid regions, strategies to enhance soil water retention are critical for crop productivity. This study elucidates the synergistic regulatory mechanisms of biochar and soil water regulation on maize root growth and photosynthesis. An integrated pot experiment (2023) with three biochar (0, 7.5, 15 t ha−1), a field experiment (2024) with two biochar (0, 7.5 t ha−1), and three soil water gradients (sufficient water, moderate drought, and severe drought) were conducted. Pot results showed that biochar applied at 7.5 t ha−1 significantly increased soil-saturated water content by 11.4% and residual water content by 4.7% compared to the control, as confirmed by the fitting van Genuchten model (R2 > 0.94). Maize roots were primarily concentrated in the 5–15 cm soil layer, with root weight density (RWD) increasing by 21.0% under 7.5 t ha−1 biochar treatment. The field experiment based on the pot results showed that biochar attenuated the drop in net photosynthesis (Pn) and stomatal conductance (Gs) under drought, reducing Pn and Gs decline by 24.5% and 21.4%, respectively, and suggesting improved efficiency. The study indicates that 7.5 t ha−1 biochar optimizes maize root growth and photosynthesis through improved soil hydraulic properties, providing a sustainable strategy for arid and semi-arid regional agriculture.

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