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首页> 外文期刊>土壤圈（英文版） >Paddy Soil Stability and Mechanical Properties as Affected by Long-Term Application of Chemical Fertilizer and Animal Manure in Subtropical China
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Paddy Soil Stability and Mechanical Properties as Affected by Long-Term Application of Chemical Fertilizer and Animal Manure in Subtropical China

机译：亚热带长期施用化肥和动物粪肥对水稻土稳定性和力学性能的影响

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摘要

Wet stability, penetration resistance (PR), and tensile strength (TS) of paddy soils under a fertilization experiment for 22 years were determined to elucidate the function of soil organic matter in paddy soil stabilization. The treatments included no fertilization (CK), normal chemical fertilization (NPK), double the NPK application rates (2NPK), and NPK mixed with organic manure (NPK+OM). Compared with CK, fertilization increased soil organic carbon (SOC) and soil porosity. The results of soil aggregate fragmentation degree (SAFD) showed that fast wetting by water was the key fragmentation mechanism. Among the treatments, the NPK+OM treatment had the largest size of water-stable aggregates and greatest normal mean weight diameter (NMWD) (P ≤ 0.05), but the lowest PR and TS in both cultivated horizon (Ap) and plow pan. The CK and 2NPK treatments were measured with PR ＞ 2.0 MPa and friability index ＜ 0.20,respectively, in the Ap horizon, suggesting that the soils was mechanically unfavourable to root growth and tillage. In the plow pan, the fertilization treatments had greater TS and PR than in CK. TS and PR of the tested soil aggregates were negatively correlated to SOC content and soil porosity. This study suggested that chemical fertilization could cause deterioration of mechanical properties while application of organic manure could improve soil stability and mechanical properties.
机译：确定了施肥22年后水稻土的湿稳定性，抗渗透性（PR）和抗张强度（TS），以阐明土壤有机质在水稻土稳定中的作用。处理方法包括不施肥（CK），常规化学施肥（NPK），两倍的氮磷钾施用量（2NPK）和与有机肥料混合的氮磷钾肥（NPK + OM）。与CK相比，施肥增加了土壤有机碳（SOC）和土壤孔隙度。土壤团聚体破碎度（SAFD）的结果表明，水的快速润湿是关键的破碎机理。在这些处理中，NPK + OM处理具有最大的水稳性团聚体尺寸和最大的正常平均直径（NMWD）（P≤0.05），但在耕层（Ap）和犁盘中PR和TS最低。在Ap水平上，分别以PR＞ 2.0 MPa和脆性指数＜0.20进行CK和2NPK处理，表明土壤在机械上不利于根系生长和耕作。在犁盘中，施肥处理的TS和PR比CK高。被测土壤团聚体的TS和PR与SOC含量和土壤孔隙度呈负相关。这项研究表明，化学肥料可能导致机械性能下降，而有机肥的施用可以改善土壤稳定性和机械性能。

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