乌梁素海和岱海的水-沉积物系统中有机磷分布特征

以乌梁素海和岱海2个不同类型湖泊为研究对象,系统探讨了2个湖泊上覆水和沉积物中有机磷(Or-P)的地球化学特征。结果表明,乌梁素海和岱海上覆水中溶解性有机磷(DOP)的含量范围分别为0.02～0.12mg·L-1和0.01～0.03mg·L-1,2个湖泊上覆水中DOP均占TDP的60%以上,是上覆水中TDP的重要组成部分和主要存在形态;乌梁素海和岱海沉积物中有机磷(Or-P)的平均含量分别为19.25～69.40mg·kg-1和168.21～178.41mg·kg-1;2个湖泊上覆水中DOP含量明显高于英格兰Tamar河口区,2个湖泊沉积物中Or-P的含量低于长江中下游浅水湖泊。据估算,乌梁素海和岱海上覆水中的DOP库分别达到12t和10t;这2个湖泊沉积物中Or-P的差异性反映了湖泊环境及生态类型对Or-P生物有效性的重要影响,揭示有机磷库是不容忽视的潜在生物有效磷源。

Distribution Characters of Organic Phosphorus in the Overlying Water-Sediment System of the Wuliangsuhai and Daihai in the Inner Mongolia Plateau,China

In this work,the concentrations and distribution characters of organic phosphorus(or-P)in the overlying water-sediments systems of the Wuliangsuhai and Daihai were discussed.The concentration ranges of dissolved organic phosphorus(DOP)in the overlying water from the Wuliangsuhai and Daihai were 0.02～0.12 mg·L~(-1) and 0.01～0.03 mg·L~(-1) respectively,which were hiigher than those in the waters of the Tamar estuary(SW England):the DOP concentrations account for not less than 60% of the total dissolved phosphorus(TDP) indicating that DOP was the dominant species of the TDP.The average concentration ranges of Or-P in the sediments from the Wuliangsuhai and Daihai were 19.25～69.40 mg·kg~(-1) and 168.21～178.41 mg·kg~(-1) respectively,which were lower than those in the sediments from shallow lakes in middle and lower reaches of the Yangtze River Area in China.On the basis of estimate,the DOP pools in the overlying water of the Wuliang-suhai and Daihai were of 12 t and 10 t respectively.The differences of Or-P revealed the differences of the environments and ecology types between the two lakes and the importance of the potential bioavailability of Or-P.