湘中南土地整理后烟田土壤肥力指标评价及空间变异特征

发布时间：2018-04-28 15:33

本文选题：土地整理 + 烟田　；参考：《水土保持研究》2017年02期

【摘要】：掌握土地整理区土壤养分特征已成为烟田快速培肥和提升土壤质量的首要问题。采用GIS与地统计学相结合的方法,评价了土地整理后烟田土壤养分等肥力指标的适宜性等级状况及其空间变异特征。结果表明:研究区土壤偏酸,有机质、碱解氮含量普遍缺乏,存在较大面积的缺钾现象;各肥力指标均属于中等变异,变异系数大小顺序依次为有效磷速效钾碱解氮有机质全氮全磷全钾pH值。有机质和速效钾的变异函数比较符合指数模型,全钾、碱解氮用高斯模型拟合效果好,而pH值、全磷、全氮和有效磷则以球状模型拟合效果最佳。肥力指标的块金系数[C0/(C0+C)]中,土壤有机质、全钾、碱解氮分别为0.903,0.998,0.823,空间相关性较弱;而pH值、全氮、全磷和有效磷的块金系数[C0/(C0+C)]变化范围为0.501~0.724,具有中等空间相关性;各肥力指标空间变程为99~1 003m,最大和最小值分别为全钾和碱解氮;各肥力指标表现出不同的空间分布特征,其中,pH值呈斑块状,碱解氮及全钾呈条带状,全磷整体上呈从北至南含量增加的梯度分布格局。
[Abstract]:Mastering the characteristics of soil nutrients in the land consolidation area has become the primary problem in the rapid fertilization and improvement of soil quality in the tobacco field. By combining GIS with geostatistics, the suitability grade status and spatial variation characteristics of soil nutrients such as soil nutrients after land consolidation are evaluated. The results show that the soil is partial to acid and organic matter in the study area. The content of alkali hydrolysable nitrogen is generally lack, and there is a large area of potassium deficiency. All the fertility indexes are medium variation. The order of variation coefficient is the total phosphorus total potassium pH value in the organic matter and total nitrogen. The variation function of organic matter and available potassium is in accordance with the exponential model. All potassium and alkali hydrolysable nitrogen use Gauss model to fit well. The pH value, total phosphorus, total nitrogen and effective phosphorus are best fitted with spherical model. In the bulk gold coefficient [C0/ (C0+C) of the fertility index, the soil organic matter, total potassium, alkali hydrolysable nitrogen are 0.903,0.998,0.823, and the spatial correlation is weak, while the pH value, total nitrogen, total phosphorus and effective phosphorus (total phosphorus) coefficient [C0/ (C0+C)] vary in the range of 0.501~0.724, with medium space. The spatial variability of each fertility index is 99~1 003m, and the maximum and minimum values are total potassium and alkali hydrolysable nitrogen, and each fertility index shows different spatial distribution characteristics. Among them, the pH values are plaque like, alkali hydrolysable nitrogen and total potassium strip, and the total phosphorus is in a gradient distribution pattern from north to south.

【作者单位】：湖南农业大学资源环境学院;邵阳市烟草公司;
【基金】：湖南省教育厅重点项目(15A085) 湖南省烟草公司2014年度重点科技项目(14-16ZDAa01) 湖南省烟草公司邵阳市公司资助项目(12143)
【分类号】：S158

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