Study On The Potassium Variation In The Different Rocky Desertification Grades Soil Of Karst Mountain Area In Guizhou Province

The studying based on different Guizhou karst rocky desertification mountain grades potassium variation of the soil characteristics of different forms. The initial conclusion is as follows:(1) In the Karst rocky desertification mountainous areas of Guizhou, total potassium available potassium; slowly release potassium with rocky desertification and gradually decreasing. From obvious rocky desertification, latent rocky desertification, mild rocky desertification, moderate rocky desertification to serious rocky desertification total potassium content is 15,11,9,7,6,3g/kg, available potassium is 200,152,131,110,91,77mg/kg, slowly release potassium is97,89,83,71,62,36mg/kg;(2) Rocky desertification soil at different levels in the western region on the entire vertical section under a gradual increase from the total potassium content, available potassium; slowly release potassium changes are not so obvious. In southwestern soil total potassium available potassium; slowly release potassium in the top-down hierarchy of Rocky into a downward trend;(3) Rocky in the western region of different grades Available potassium; slowly release potassium ; total potassium content of the soil surface From obvious rocky desertification→latent rocky desertification→mild rocky desertification→moderate rocky desertification→serious rocky desertification decrease gradually. In the southwest region, the north-eastern region the central region of the different forms of potassium content Rocky degree aggravated gradual reduce. Arable land and the natural soil in the southwestern areas, the downward trend in the productivity of land;(4) Rocky desertification grades in the same soil potassium forms in the north-eastern region, followed by the western region, southwestern Central; Potassium content in different forms of agricultural land northeast >Southwest >west;(5) Karst areas in Guizhou different forms of potassium in soil and rocks exposed rate was inversely related to slope, and vegetation cover, coverage by soil, the soil root system, the soil is proportional to the number of animals;(6) Karst areas in Guizhou and silt soil potassium, and organic matter to a significant positive correlation between as a significant negative correlation with grit, with the clay, CEC, nitrogen, phosphorus, exchangeable Ca, Mg, not so relevant;(7) Slow-release potassium and organic matter, as a significant positive correlation between CEC and clay, silt, sand, nitrogen, phosphorus, There was no significant correlation of exchangeable calcium and magnesium;(8) Potassium and organic matter, CEC, nitrogen and phosphorus to significantly positive correlation between nitrogen and alkali solution for the significant correlation between and the clay, silt, sand, exchangeable Ca, Mg, not so relevant.Karst rocky desertification potassium of different levels soil morphological variation of characters, Karst Rocky desertification soil in the desertification classification category potassium Characters and Variation .And through the soil potassium evaluation summarized karst mountain soil potassium deficiency situation.