东北典型黑土区坡面土壤速效磷空间分布规律

发布时间：2019-01-02 07:08

【摘要】：土壤速效磷是反映土壤供磷水平的重要指标,也是磷环境风险评价的重要参数,研究其空间分布规律可为农田合理施肥和生态环境治理提供依据。研究利用多条典型样带系统地揭示了典型黑土区0—60cm剖面土壤速效磷水平和垂直方向分布规律。结果表明:研究区土壤速效磷(Olsen-P)含量为0.57~50.01mg/kg,耕层(0—20cm)速效磷为10~40mg/kg,位于充足水平以上。垂直方向上,土壤速效磷从表土层0—20cm处向深土层50—60cm处减小。施肥降低了表土层速效磷的变异程度,侵蚀和沉积增加了深土层的变异程度(20—50cm)。水平方向上,土壤速效磷总体沿坡向向下呈下降趋势,侵蚀和沉积同时降低了坡背和坡底土壤速效磷的含量。
[Abstract]:Soil available phosphorus is not only an important index to reflect the level of soil phosphorus supply, but also an important parameter of phosphorus environmental risk assessment. The study of its spatial distribution law can provide the basis for rational fertilization and ecological environment management in farmland. The horizontal and vertical distribution of soil available phosphorus in 0-60cm profile of typical black soil area was systematically revealed by using several typical samples. The results showed that the content of available phosphorus (Olsen-P) in soil was 0.57 ~ 50.01 mg / kg, and the available phosphorus in tilling layer (0-20cm) was 10 ~ 40 mg 路kg ~ (-1), which was above sufficient level. In the vertical direction, the available phosphorus decreased from 0-20cm to 50-60cm in deep soil. Fertilization reduced the variation of available phosphorus in the surface soil layer, and increased the variation degree of deep soil layer (20-50cm) by erosion and deposition. In the horizontal direction, soil available phosphorus decreased along the slope, erosion and deposition decreased the content of soil available phosphorus on slope back and bottom simultaneously.
【作者单位】：东北农业大学资源与环境学院;
【基金】：国家自然科学基金“冻融作用下侵蚀黑土耕层氮磷时空分异变化驱动机制研究”(41471228) 东北农业大学“学术骨干”项目“冻融作用下黑土磷空间格局变化及主要驱动机制”(15XG08) 黑龙江省普通本科高等学校青年创新人才培养计划“侵蚀黑土坡面速效氮时空格局变化的驱动机制研究”(UNPYSCT-2016011) 大学生创新训练项目“冻融驱动下黑土磷空间格局变化特征研究”(201510224008)
【分类号】：S158

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