土地整理后烟田土壤钾素含量和肥力特征

Potassium Content and Fertility of Tobacco Field Soils after Land Consolidation

选取湘中邵阳县1个面积140 hm2的土地整理项目区,用网格法采集耕层土壤样品213个,分析土壤钾(K)组分的含量和肥力等级。结果表明,该项目区土地整理后烟田耕层土壤的全K、速效K和缓效K含量的平均值分别为18.26 g/kg、178.2 mg/kg和334.1 mg/kg,均为适宜水平,土地整理并未明显影响土壤K素含量。成土母质对土壤K素及组分含量的影响很大,全K、缓效K和速效K的平均含量以河流沉积物发育的土壤较高,均在适宜水平以上;第四纪红土发育土壤居中;石灰岩风化物发育土壤最低,均低于适宜水平。项目区内,石灰岩风化物发育土壤应增施K肥,而科学管理土壤K素应对不同母质发育的土壤制定不同K肥施用方案。

A district （140 hectare） of land consolidation in Shaoyang county, central Hunan province was chosen, and 213 soil samples were collected using grid method. The content of soil potassium （K） and its components were analyzed and the soil fertility was evaluated. It is indicated that the mean value of total K, slow-release K and availability K was 18.26 g kg-1, 334.1 mg kg-1, and 178.2 mg kg- 1, respectively, all of which were ranked at the optimum level. The soil consolidations showed minor effects on the content of soil K, while the parent material exhibited great effects on soil K content and its components. Soils developed from fluvial deposit had the highest average contents of total K, slow-release K and availability K, and were ranked as above the optimum level. Soils developed from Quaternary red clay had moderate level. Soils derived from limestone had the lowest average content of total K, slow-release K and availability K, and were ranked at the deficit level. We should increase the application of K fertilizer for soils developed from limestone in the project district, and implement different fertilization schemes for soils derived from different parent materials.