Distribution Characteristics of Nitrogen and Phosphorus in Sediments of Hengshui Lake
Sediment samples from 14 representative sites in Hengshui Lake as the research object to analyze the change characteristics of total organic carbon(TOC),total phosphorus(TP),available phosphorus,pH,and different forms of nitrogen and phosphorus in the sediments.The results showed that the average TOC content and pH value in Hengshui Lake sediments were 20.29±0.62 g/kg and 7.77±0.14 respectively,showing a weak alkalinity.The average nitrogen content of different forms was as follows:strong base extractable nitrogen(SAEF-N,0.06 mg/g,46.54%)<ion exchange nitrogen(IEF-N,0.15 mg/g,17.59%)<strong oxidizer extractable nitrogen(SOEF-N,0.22 mg/g,38.86%)<weak acid extractable nitrogen(WAEF-N,0.73 mg/g,28.82%).NO3--N was dominated in SOEF-N,and NH4+-N was dominated in the other three forms of nitrogen.The average content of TP was 1.36 g/kg,which belonged to the above medium pollution level,and the average content of available phosphorus was 15.96 mg/kg.The average content of phosphorus in different forms was calcium bound phosphorus(Ca-P,129.40 mg/kg)<closed storage phosphorus(O-P,117.61 mg/kg)<weakly adsorbent phosphorus(NH4Cl-P,56.10 mg/g)<the sum of Fe-bound phosphorus(Fe-P)and Al-bound phosphorus(Al-P)(35.74 mg/kg).In summary,the risk of phosphorus release in Hengshui Lake sediments was relatively low,and there was a certain risk of nitrogen release.
Hengshui Lakesedimentforms of phosphorusforms of nitrogenwetland ecology
NETL
NSTL
万方数据
