Core sediments from the Muthupettai mangroves on the southeast coast of India were analyzed for soil texture,total nitrogen,organic carbon,phosphorus and heavy metals(Fe,Mn,Cr,Cu,Ni,Pb,Zn and Cd).The distinct seasonal...Core sediments from the Muthupettai mangroves on the southeast coast of India were analyzed for soil texture,total nitrogen,organic carbon,phosphorus and heavy metals(Fe,Mn,Cr,Cu,Ni,Pb,Zn and Cd).The distinct seasonal variation in the distribution of metals in the sediments was observed.The minimum concentration was recorded in river mouth and the maximum was in lagoon.High metal concentration in sediment was observed during monsoon and low concentration in summer.The total nu-trient in lagoon and river mouth was recorded in the range of 4.528 to 8.526 mg g-1 for organic carbon,2.213 to 10.5 mg g-1 for nitro-gen and 0.824 to 7.22 mg g-1.展开更多
Nitrogen in Hongfeng South Lake water mainly comes from sewage with high N concentra- tions from Pingba Chemical Fertilizer Plant (PCFP). Studies on the sediment core HF010427 sampled in the lake showed that the upwar...Nitrogen in Hongfeng South Lake water mainly comes from sewage with high N concentra- tions from Pingba Chemical Fertilizer Plant (PCFP). Studies on the sediment core HF010427 sampled in the lake showed that the upward increase of nitrogen isotopic composition of sedimentary organic nitrogen (δ 15Norg) accorded with the trend of industrial total production (TP) of PCFC. On the contrary, diagenesis will theoretically cause an upward decrease of δ 15Norg. Because no treatment of sewage water was carried out, TP corresponds with sewage emission, indicat- ing that sedimentary δ 15Norg can reflect well the total trend of sewage input. The very similar profile shape between nitrogen isotopic composition of sedimen- tary absorbed ammonium (δ 15NH4+absorbed) and TP of PCFP suggests that δ 15NH4+absorbed can be used to reconstruct more detailed situation of sewage input. The study has a reference to history investigation of sewage input.展开更多
文摘Core sediments from the Muthupettai mangroves on the southeast coast of India were analyzed for soil texture,total nitrogen,organic carbon,phosphorus and heavy metals(Fe,Mn,Cr,Cu,Ni,Pb,Zn and Cd).The distinct seasonal variation in the distribution of metals in the sediments was observed.The minimum concentration was recorded in river mouth and the maximum was in lagoon.High metal concentration in sediment was observed during monsoon and low concentration in summer.The total nu-trient in lagoon and river mouth was recorded in the range of 4.528 to 8.526 mg g-1 for organic carbon,2.213 to 10.5 mg g-1 for nitro-gen and 0.824 to 7.22 mg g-1.
基金supported by the Major Projects of Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KZCX1-SW-12-1)the Foundation of Chinese Academy of Sciences for Key and Innovation Projects(Grant Nos.KZCX3-SW-140 and KZCX2-105)the National Natural Science Foundation of China(Grant Nos.40373039,40573006 and 40173012).
文摘Nitrogen in Hongfeng South Lake water mainly comes from sewage with high N concentra- tions from Pingba Chemical Fertilizer Plant (PCFP). Studies on the sediment core HF010427 sampled in the lake showed that the upward increase of nitrogen isotopic composition of sedimentary organic nitrogen (δ 15Norg) accorded with the trend of industrial total production (TP) of PCFC. On the contrary, diagenesis will theoretically cause an upward decrease of δ 15Norg. Because no treatment of sewage water was carried out, TP corresponds with sewage emission, indicat- ing that sedimentary δ 15Norg can reflect well the total trend of sewage input. The very similar profile shape between nitrogen isotopic composition of sedimen- tary absorbed ammonium (δ 15NH4+absorbed) and TP of PCFP suggests that δ 15NH4+absorbed can be used to reconstruct more detailed situation of sewage input. The study has a reference to history investigation of sewage input.
