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Plant growth in soil potassium is one of essential nutrients, which can activate a variety of enzymes, increased photosynthetic rate, promoting substance synthesis, enhance crop resistance and other functions. Based on the level of Guizhou Karst Mountainous different rock soil variability of different forms of potassium study, the results are as follows: (a) surface soils in Guizhou karst mountain full of potassium, slow potassium, potassium content increased with the degree rocky increased gradually decreased, never rocky → no obvious potential rocky desertification → → → mild to moderate rocky rocky rocky soil in full strength → potassium content are 15,11,9 , 7,6,3 g / kg, slowly available potassium content are 200,152,131,110,91,77 mg / kg, K content is 97,89,83,71,62,36 mg / kg; (2) Rocky Desertification in the western region in the vertical cross section of soil total K content increased gradually from top to bottom, slowly available K and K content changed insignificantly. In the southwestern soil available K, slow potassium, total potassium level in the absence of rocky top to bottom into a downward trend in the rest rocky grade potassium vertical section of Various Forms of little change; (3) in western region different rock surface soil total potassium level, slowly available K, available potassium never no obvious rocky rocky → → → mild to moderate rocky rocky rocky → intensity decreases In the Southwest, Northeast and central regions with different forms of potassium levels exacerbate desertification gradually reduced. Cultivated soil in the southwestern region compared with the natural soil, land productivity decline: (4) at the same level rocky soils under potassium highest in the Northeast, followed by the western region, Southwestern, Central; in agricultural land in the northeastern part of different forms of potassium> Southwestern> Western; (5) in Guizhou karst areas of different forms of potassium in soil and bare rock ratio is inversely proportional to the slope, and vegetation cover, soil cover coverage, soil root condition, proportional to the number of animals in soil relationship: (6) in Guizhou Karst Mountainous soil total K and silt, organic matter as a significant positive correlation with sand as a significant negative correlation with clay, CEC, nitrogen, phosphorus, no obvious correlation exchangeable calcium and magnesium: (7) slowly available K and organic matter, CEC is very significant positive correlation with clay, silt, sand, nitrogen, phosphorus, exchangeable calcium and magnesium obvious correlation; (8) potassium and organic matter, CEC, total nitrogen, available phosphorus is highly significant positive correlation with nitrogen was significantly correlated with soil clay, silt, sand, exchangeable Ca correlation is not obvious. Rocky Desertification in Guizhou Karst Mountainous different level of soil variability of different forms of potassium study, summed up the soil in Guizhou Karst Mountainous rocky rocky soil potassium hierarchical classification characteristics and traits Variation; and through the soil potassium evaluation, summarized the karst mountain soil potassium deficit situation.
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