Study On Variation Features Of Phosphorus Of Karst Rocky Desertification Soil And Ecological Restore In GuiZhou

This study has discussed variation features of Nitrogen of Karst Rocky Desertification soil at different degrees of Karst Rocky Desertification , in different areas, and under different ecological modes, as well as at different levels of soil profiles separately, has established the phosphorus element target at different degrees of Karst Rocky Desertification, then discuss ecological environment restores, The main conclusions are as follows:(1) Compared with Karst no-Rocky Desertification soil, the content of soil Organic Matter and Phosphorus in various degrees of Karst Rocky Desertification shows a tendency to drop suddenly. The content of soil Organic Matter, the entire phosphorus, the organic phosphorus, the inorganic phosphorus decreases with the degradation of degrees of Karst Rocky Desertification, The content of soil Ca₁₀-P, Ca₈-P, Ca₂-P, Al-P, the 0-P in north-west also displays the same variation law, but Fe-P has not displayed the obvious variation law.(2) Compared with Karst no-Rocky Desertification soil (forest soil), the content of desertification soil Organic Matter and Phosphorus (farming soil, meadow soil, and de-farming soil)under different ecological modes show a tendency to drop suddenly in the Karst Rocky Desertification area(middle, eastern , north west and west in GuiZhou). But the variation laws of content of different shape phosphorus have nothing in common among them. The content of desertification soil Organic Matter and Phosphorus is as follows: forest soil > meadow soil in Karst no-Rocky Desertification t area (south in Gguizhou), but the disparity is relatively little compared with Karst Rocky desertification area.(3) Established the phosphorus element target at different degrees of Karst Rocky Desertification soil. With the Karst Rocky Desertification degree develops from no obvious Karst Rocky Desertification to the strength Karst Rocky Desertification , phosphorus element target presents obviously reduces the tendency, and the variation become weaker. The phosphorus element target of different degrees of Karst Rocky Desertification soil may be a nutrition target judgingt Karst Rocky Desertification ecological environment(4) The content of inorganic phosphorus has different variation laws in different areas. Under the different degrees of Karst Rocky Desertification, different area and the different ecology pattern , the proportion of inorganic phosphorus component accounts for the inorganic phosphorus not to be inconsistent with the content change tendency, but it basis consistent in north-west area lime soil. (5)The organic matter and various shapes phosphorus element main concentrates on top layer in soil profiles,, and reduces gradually along with the soil profiles, but the Fe-P content displays the same variation law. The law of profile A soil Organic Matter and Phosphorus in various ecology pattern is: forest soil > meadow soil > de-farming soil >farming soil.(6) Soil Fe-P, fast-acting phosphorus content variation disorder.(7) The content of sand grain of strongest rocky desertification soil is high, and the sandification is serious. Except for that, the proportion of sand grain, flour sand grain and glue grain in the top soil layer is more appropriate in Guizhou, and the content of glue grain decreases and increases respectively with the degree of rocky desertification and soil level growing.(8)In general, Organic Matter and Phosphorus of various degrees of Karst Rocky Desertification soil and thick silt grain(0.01-0.05mm) are extremely remarkable positive association, they and sand grain are (extremely) negative remarkable association, but as a whole west north-west Guizhou, the soil phosphorus and the soil machinery composes is no remarkable association. Soil Organic Matter and Phosphorus under different ecological modes and glue, flour sand and sand grains are certain association , but their levels are different. Organic Matter and Phosphorus of soil levels in soil profiles and Soil mechanical composition are no remarkable association.(9) With the development of Karst Rocky Desertification from no-Rocky Desertification to the strongest rocky desertification and the ecology pattern change with forest soil-meadow soil-farming soil-de-farming soil, the soil phosphorus content unceasingly reduces, also along with the Rocky Desertification degree enhancement, the phosphorus content variation is weaker. And with time increase, soil phosphorus is restored which gradually. According to this, it shows that, the phosphorus nutrition may restore gradually under the natural condition in Karst Rocky Desertification areas.