浏阳植烟区土壤主要养分的空间分布及管理分区

Spatial Variability and Management Zone of Soil Major Nutrients in Tobacco Fields in Liuyang County

为实现浏阳植烟区烤烟养分精准管理,采用地统计学和模糊c均值聚类相结合的方法,研究浏阳植烟区土壤主要养分的空间分布和精准分区。结果表明:浏阳植烟区土壤主要养分指标均为中等程度变异,各项指标均表现为中等的空间相关性,其空间变异同时受结构性因素和随机性因素的影响。其中,土壤pH、有机质、碱解氮和速效钾含量的均值分别为5.69、29.30g/kg、145.11mg/kg和206.33mg/kg,属中等水平;约有20%的面积土壤速效钾缺乏。全氮和有效磷含量均值分别为1.74g/kg和42.37mg/kg,分别属高和极高水平。浏阳植烟区可划分为高氮高磷低钾,高氮高磷钾素中等,适氮高磷钾素中等3个养分管理分区,3个分区间有机质、全氮(g/kg)、碱解氮和速效钾含量差异显著或极显著。

In order to achieve site specific nutrient management of tobacco in Liuyang,based on GPS,geo-statistics and fuzzy c-mean algorithm,spatial variability and management zone of soil major nutrients in tobacco fields in Liuyang were studied.Results：Main soil nutrients were intermediate variability.Various indicators showed moderate spatial dependence.Spatial variability of main nutrients were caused by structural factors and random factors.Soil pH,organic matter,alkali hydrolyzable nitrogen and available potassium were at moderate level,with mean of 5.69,29.30g/kg,145.11mg/kg and 206.33mg/kg,total nitrogen and available phosphorus were at＂high＂and＂very high＂level,with mean of 1.74g/kg and42.37mg/kg,about 20% of the area was of deficient available potassium in soil.Liuyang tobacco-planting area can be divided into three nutrient management zone,There are significant difference or very significant in soil organic matter,total nitrogen,alkali solution nitrogen and available potassium content among the three divisions,including high N-high P-low K,high N-high P-moderate K and moderate N-high Pmoderate K.