宁乡植烟土壤主要养分时空分布研究

Study on the Spatial and Temporal Distribution of Main Nutrients in Tobacco Planting Soil in Ningxiang

为了探明宁乡烟区主要养分时空变异特征,为植烟土壤养分管理提供参考,以宁乡市2000年和2014年耕地土壤主要养分为研究对象,利用经典统计学方法和地统计学等方法,对县域土壤主要养分变异变化和时空分布进行了研究。结果表明,15 a土壤全氮、碱解氮、全磷、有效磷、全钾和速效钾的含量分别增加了0.13 g/kg、17.25 mg/kg、0.02 g/kg、19.37 mg/kg、1.27 g/kg和78.98 mg/kg,增幅分别为6.63%、11.03%、3.39%、167.71%、7.98%和87.69%;从空间分布来看,全氮适宜的面积有明显减少,而全氮"高"等级的面积大幅上升。土壤碱解氮适宜的面积小幅减少,碱解氮含量"高"等级的面积大幅增加。全磷"极低""低"的面积基本相同,2个年度均以"低""极低"的分布面积最大。有效磷含量"低"的面积大幅减少,"高""极高"的面积大幅增加,全钾含量"极低"等级的面积有大幅下降,其他等级的面积变化不大;土壤速效钾含量"适宜"等级的面积从零大幅增加,"低""极低"等级的面积有减少趋势,且"高"等级面积有所增加。

In order to study the main nutrient variation of Ningxiang tobacco area characteristics,and provide reference for planting tobacco soil nutrient management,the main soil nutrients in2000and2014of cultivated land in Ningxiang city as the research object,using the classical statistics method and geo statistics method on Soil Nutrient Variation and the temporal and spatial distribution are studied.The results show that the content of15a soil total nitrogen,available nitrogen,total phosphorus,available phosphorus,total potassium and available potassium were increased by0.13g/kg,17.25mg/kg,0.02g/kg,19.37mg/kg,1.27g/kg and78.98mg/kg,an increase of6.63%,11.03%,3.39%,167.71%,7.98%and87.69%;in terms of spatial distribution,the suitable area of total nitrogen was significantly reduced,while the area of the"high"level of total nitrogen increased significantly.The suitable area of available nitrogen in soil decreased slightly,and the area of"high"level of available nitrogen increased greatly.The area of"extremely low"and"low"of total phosphorus is generally similar,and the area of"low"and"extremely low"is the largest in the2years.The content of available phosphorus in"low"area is significantly reduced,"high"and"extremely high"area increased significantly,the total potassium content of"extremely low"level area has dropped significantly,and the area of other grades changed unobviously.The area of the"suitable"level of soil available potassium increased significantly from zero,and the area of"low"and"extremely low"decreased,and the area of"high"increased.