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首页> 外文期刊>Plant and Soil >Mechanical properties and soil stability affected by fertilizer treatments for an Ultisol in subtropical China
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Mechanical properties and soil stability affected by fertilizer treatments for an Ultisol in subtropical China

机译：亚热带Ultisol的施肥处理对力学性质和土壤稳定性的影响。

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摘要

Soil mechanical properties are crucial for plant growth, soil erosion, tillage and traffic. The soil mechanical properties and stability of an Ultisol were determined in a 13-year fertilization experiment in subtropical China. The effect of organic matter on soil structure was also evaluated. The treatments include: unfertilized, mineral fertilized, mineral mixed with straw, and animal manure. Bulk soil strengths (shear strength and penetration resistance) were tested in field. Aggregate strengths (penetration resistance and tensile strength), water stability, organic carbon (OC), hot-water-extractable carbohydrate (HWEC) and some related factors were determined in laboratory. Fertilizer increases aggregate penetration resistance, tensile strength, water stability and organic matter content in cultivated horizon (0-15 cm depth), especially at the 0-5 cm layer. OC and HWEC showed significantly regression relationships with aggregate water stability, porosity and water repellency for the whole soil profile (0-40 cm). Aggregate strengths also increased with OC and HWEC in cultivated horizon. Animal manure is most effective in improving soil structure while aggregate water stability is the most sensitive index of fertilizer management. Soil organic matter is a strong determinant of soil structure. Both OC and HWEC are good indicators of surface aggregate strengths and stability, and thus, soil quality in this region.
机译：土壤机械特性对植物生长，土壤侵蚀，耕作和运输至关重要。通过在亚热带地区进行的为期13年的施肥实验，确定了Ultisol的土壤力学性能和稳定性。还评估了有机物对土壤结构的影响。处理包括：未受精，受精矿物，与秸秆混合的矿物和动物粪便。现场测试了大块土壤强度（抗剪强度和抗穿透性）。在实验室中确定了总强度（抗渗透性和抗张强度），水稳定性，有机碳（OC），可热水提取的碳水化合物（HWEC）和一些相关因素。在耕层（0-15厘米深），特别是在0-5厘米层，肥料提高了骨料的抗穿透性，抗张强度，水稳定性和有机质含量。 OC和HWEC与整个土壤剖面（0-40厘米）的总水稳定性，孔隙率和憎水性之间显示出显着的回归关系。 OC和HWEC在耕地中的综合实力也有所提高。动物肥料对改善土壤结构最有效，而集水稳定性是肥料管理的最敏感指标。土壤有机质是决定土壤结构的重要因素。 OC和HWEC都是表面聚集体强度和稳定性以及该地区土壤质量的良好指标。

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