乌兰布和沙漠颗粒物中磷的赋存形态及环境意义

Phosphorus forms in Ulan Buh Desert particles and its environmental significance

海洋中的磷由河流和沙漠输入,我国北部海域由内蒙古西部沙漠-沙尘暴-黄河口-黄渤海构成世界磷循环的一部分。文中采用连续分级提取方法对主要入黄河的乌兰布和沙漠颗粒物磷形态分布特征进行了研究。结果表明:乌兰布和沙漠颗粒物原样中的总磷(TP)含量为740.52μg/g,其主要成分为无机磷(IP),占TP的比例为96.17%;有机磷(Porg)含量为28.13μg/g,占TP的3.80%。在所有不同粒度的沙漠颗粒物中,原生碎屑钙磷(Pdet)含量最高,占总磷的23.50%─65.99%,其次是自生钙磷(Paut),占总磷的20.43%─58.21%;乌兰布和沙漠每年向黄河输送1.1万吨总磷,其中可交换磷为492吨。

The phosphorus in sea is partially from sands and river inputs. North china is the part of the global phosphorus cycle. The shores of North China were limited by phosphorus. In this study,sequential extraction analytical method was used to study the speciation of phosphorus of Ulan Buh Desert particles. The results showed that the content of total phosphorus（ TP） of the natural samples in Ulan Buh Desert particles are 740. 52μg / g,with main composition of inorganic phosphorus（ IP）,with average of 96. 17% in TP. The concentration of organic phosphorus（ OP） is 28. 13μg / g,（ with average of 3. 80% in TP）. Pdetis the most abundant speciation,with 23. 50% ─65. 99%,Pautis the second abundant speciation,taking 20. 43% ─58. 21% in desert particulates. Comparing the speciation of phosphorus between surface sediments of Yellow River and sands of deserts,we found that the sand from the deserts of Inner Mongolia functions as a phosphorus source hence transports large amounts of phosphorus into the Yellow River. Ulan Buh Desert transported 11 thousand ton phosphorus into the Yellow River annually,and the content of exchangeable phosphorus was 492 ton.