宁乡植烟土壤养分空间变异及丰缺评价

目的]研究宁乡烟区植烟土壤养分的丰缺状况。方法]分析了宁乡县植烟土壤的常规统计特征和空间分布特征,并参考前人制订的养分评价标准对养分指标进行丰缺评价。结果]宁乡县植烟土壤酸碱度基本适宜,微酸性(p H 5.5~6.5)和强酸性(p H 4.5~5.5)植烟土壤的分布面积分别为57.13%和42.72%;宁乡县植烟土壤有机质含量较高,有机质含量为"很高"(≥40 g/kg)和"高"(30~40 g/kg)的植烟土壤分布面积分别为64.10%和35.90%;宁乡县植烟土壤碱解氮含量偏高,碱解氮含量为"很高"(≥150 mg/kg)和"高"(120~150 mg/kg)的植烟土壤分布面积分别为70.43%和21.55%;宁乡县植烟土壤有效磷含量偏低,含量为"低"(10~20 mg/kg)和"很低"(10 mg/kg)的植烟土壤分布面积分别为76.27%和12.47%;宁乡县植烟土壤速效钾含量偏低,98.89%的植烟土壤速效钾在100 mg/kg以下。宁乡县植烟土壤有效硼含量较低,全县植烟土壤有效硼含量均在临界值以下(0.5 mg/kg)。宁乡县植烟土壤有效锌含量中等,中等(1.5~3.0 mg/kg)和低的分布面积分别为66.48%和33.52%。结论]该研究为烟叶生产上科学地进行养分管理提供指导。

Spatial Variation and Abundance Evaluation of Soil Nutrient in Ningxiang Soil

Objective]To study abundance situation of soil nutrient in Ningxiang soil.Method]The conventional statistical characteristics and spatial distribution characteristics of tobacco soil in Ningxiang were analyzed,and the nutrient index was evaluated by reference to the evaluation criteria.Result]Soil pH in Ningxiang was basically suitable,and the distribution area of acid(5.5-<6.5)and strong acid(4.5-<5.5)to-bacco soil were 57.13%and 42.72%;Tobacco soil in Ningxiang had high organic matter content,and the distribution area of organic matter con-tent in Ningxiang for very high(≥40 g/kg)and high(30-<40 g/kg)were 64.10% and 35.90%;Alkaline hydrolysis nitrogen content was high,and the distribution area of alkaline hydrolysis nitrogen content for"very high"(≥150 mg/kg)and"high"(120-<150 mg/kg)were 70.43% and 21.55%; Available phosphorus content was low,and the distribution area of available phosphorus content for"low"(10 -<20 mg/kg)and"very low"(<10 mg/kg)were 76.27% and 12.47%;The content of available potassium was low,and the available potassi-um in the area of 98.89%was below 100 mg/kg.The available boron content in tobacco soil was low,and the content of available boron in all ar-ea of the whole county was below the critical value(0.5 mg/kg).The content of available zinc in tobacco soil was medium,and the distribution area of available zinc content for medium(1.5-<3.0 mg/kg)and low were 66.48% and 33.52% respectively.Condusion]The study can provide guidance for the scientific management of nutrient management in tobacco production.