施磷对水稻土硅素吸附与解吸特性的影响

研究了水稻土中施磷 (P)对硅 (Si)吸附与解吸特性的影响。结果表明 ,由于土壤中Si、P元素化学性质和结构相似 ,存在着竞争性吸附 ,施P降低了土壤中Si的吸附量 ,同时增加了土壤Si的解吸量 ,提高土壤Si的解吸率。表明P在降低土壤Si吸附量的同时 ,也由于降低了土壤对Si的吸附结合能 ,从而增加了Si的解吸量。P的存在对Si的吸咐具有一种外推作用。连续解吸试验进一步证实了上述的观点。

Effect of supply phosphorus on adsorption and desorption action of silicon in paddy soil

The effect of supplying phosphorus on adsorption and desorption action of silicon in paddy soil was studied. The results showed that supplying phosphorus to the soil decreased the amount of adsorption for silicon because of competitive between silicon and phosphorus,and increased silicon desorption and desorption rate in soil. This was, on one hand application of phosphorus reduce silicon adsorption, and other hand enhanced easily desorbed silicon content because of decreased bonding energy of silicon. Application of phosphorus produced the pushing action for silicon adsorption. This opinion is proved out by successive desorption experiment further.