江西省红壤旱地土壤钾素含量分布研究

Study on The Distribution of Potassium of Red Upland Soil in Jiangxi

本项研究对江西省五种主要成土母质发育的红壤旱地土壤，按土属布点，共取表层土样２４８个，剖面样７５个，分别测定了全钾、缓效性钾和速效钾含量，查明了全省红壤旱地土壤全钾、缓效性钾、速效性钾含量平均分别为１６．７ｇｋｇ￣（－１）±７．３ｇｋｇ￣（－１）、２５１．９ｍｇｋｇ￣（－１）±１４５．９ｍｇｋｇ￣（－１）和６３．９ｍｇｋｇ￣（－１）±３２．４ｍｇｋｇ￣（－１），低于缺乏临界水平（速效性钾＜７０ｍｇｋｇ￣（－１）的样品占７９．５％。阐明了不同成土母质发育的红壤旱地颖型间的钾素含量的差异，以及影响钾素含量的因素有母质、含钾矿物、有机质、质地和粘粒。绘制出土壤缓效性钾、速效性钾含量分布图为红壤旱地土壤资源评价和合理施用钾肥提供了依据。

This project had sampled 248 surface soil samples and investigated 2 5 section samplesthat were distributed over jiangxi province based on soil genus of 5 main parent materials. Theanalaysis data of total K,slow available K and available K of seils were 16.7gkg￣(-1)±7.3gkg￣(-1),251.9mgkg￣(-1)±145.9mgkg￣(-1) and 63.9mgkg￣(-1)±32.4mgkg￣(-1),respoctively. There were 79.5%of totalsemples under the critidrl level(available K :70mgkg￣(-1)).This paper also illuminated the difference ofseil K content among soils developed from difference parent materials and the factors influenced soil Kcontent,such as parent material, potassium mineral ,organic matter , texture and clay. The slowavailable K and available K distribution map were pictured in order to provide a basis for evaluatingred upland soil and utilizing potassium fertilizer.