桑植县耕地土壤供钾特征及其空间分布规律

Potassium Supplying Characteristics and Spatial Distribution Law of Arable Land Soil in Sangzhi County

采用调查采样、分析测定、GIS等方法,研究了桑植县耕地土壤的供钾特征及其空间分布规律。结果显示,桑植县耕地土壤供钾强度较弱,供钾容量较大。土壤速效钾含量平均为111.0 mg/kg,属低含量水平,低含量水平分布面积为14 333.4 hm2,且空间变异性较大。土壤缓效钾含量平均为305.4 mg/kg,属高含量水平,高与极高含量水平分布面积为13 313.4 hm2。农业生产中,除合理施用速效钾肥外,应采取有效措施促进土壤缓效钾向速效钾转化,以维持土壤供钾水平。

The spatial distribution and potassium supplying characteristics of arable land soil in Sangzhi County were studied by using the methods of investigation and sampling,analytic determination,and GIS.The results showed that the soil potassium supplying intensity was poor,while the soil potassium supplying capacity was high;the average content of soil available potassium was low（111.0 mg/kg）,and the distribution area of the low soil available potassium content was 14 333.4 hm2 with high spatial variability;the average content of soil slowly available potassium was high（305.4 mg/kg）,and the total distribution area of the high and the extremely high soil available potassium content was 13 313.4 hm2.Therefore,the results suggested that during agricultural production,besides rational applying available potassium fertilizer,it also should apply some effective measures to promote the soil slowly available potassium transforming to soil available potassium,which can maintain the capability of soil potassium supplying.