Yu J.-B.,CAS Yantai Institute of Coastal Zone Research |
Yu J.-B.,Binzhou University |
Dong H.-F.,CAS Yantai Institute of Coastal Zone Research |
Wang H.-B.,Science and Technology Bureau of Dongying City |
And 7 more authors.
Wetland Science | Year: 2011
Abstract: Applying method of samples with transects, the spatial distributions of 12 kinds of soil metal elements (Na, Mg, Ca, Al, Cr, Pb, Sr, Co, Ga, V, Ni and Ti) in the new-born coastal wetland of the Yellow River delta were studied by laying two transects running riverward to seaward. The results showed that, from the Yellow River bank to salt beach, 11 kinds of metals except Ti showed increasing trend gradually. The contents of all of studied metal elements in 0-30 cm soil depth were much higher than those in inland marsh. Comparing with soil background values of the study area, heavy metals of Cr, Pb and Ni were all at light pollution level in soil of the Yellow River Delta. The variation differences in soil profile were significant for all metal elements. The contents of Na and Sr increased with soil depth, while inverse variations of Ca and Mg were observed, the variations of Pb, Co, Ga, V, Ni and Ti contents showed an ' S ' shape in soil profile. Correlation analysis showed that there were extremely significant positive correlations of contents of total organic carbon, total nitrogen, NO 3-N and contents of Ca, Mg, Al, V, Co, Ga, Sr, Cr, Ni and Pb in studied soils. The results indicates that the contents of total organic carbon, total nitrogen, NO 3-N were key factors for soil adsorption of metal elements in new-born coastal wetlands of the Yellow River Delta.
Wei J.-F.,Ocean University of China |
Chen H.-T.,Ocean University of China |
Liu Y.-L.,Administration of Shandong Yellow River Delta National Nature Reserve |
Shan K.,Administration of Shandong Yellow River Delta National Nature Reserve |
And 3 more authors.
Huanjing Kexue/Environmental Science | Year: 2011
Suspended particulate matter samples were collected from Lijin Station on the Yellow River during the 2008 water and sediment regulation. Using water elutriation method, samples were physically separated according to grain size, and phosphorus forms were detected by the improved SEDEX technology. Results show that authigenic apatite phosphorus and organic phosphorus are the dominant forms of the particulate phosphorus. During water and sediment regulation, concentrations of total particulate phosphorus, loosely adsorbed phosphorus, organic phosphorus and refractory phosphorus are lower than those in other time of the year, while the concentration of detrital fluorapatite phosphorus is higher than that in other time. Grain size is the primary variable in the determination of the content of various particulate phosphorus forms. In fine particles, loosely adsorbed phosphorus, organic phosphorus and refractory phosphorus concentrations are high, while detrital fluorapatite phosphorus concentration is high in coarse particles. About 28.3% of the total particulate phosphorus is in the form of bio-available phosphorus, of which organic phosphorus is the major component. During the water and sediment regulation, the fluxes of sediment, particulate phosphorus and particulate bio-available phosphorus are 6.63 × 107 t, 3.42 × 104 t, and 8.30 × 103 t, which are 83.2%, 78.6%, and 80.2% each of the total fluxes in 2008.
Yu J.,CAS Yantai Institute of Coastal Zone Research |
Yu J.,Binzhou University |
Chen X.,CAS Yantai Institute of Coastal Zone Research |
Sun Z.,CAS Yantai Institute of Coastal Zone Research |
And 8 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2010
Based on the distribution of vegetation, two transects from the Yellow River bank to a salt beach were selected in new-born coastal wetland in the core area of the Yellow River Delta National Nature Reserve to study the spatial distribution characteristics of soil nutrients. The results show that the average contents of TN, NH4 +-N, NO3 --N, TOC, TS and TP in topsoil of new-born coastal wetland in Yellow River delta were 419.37 mg·kg-1, 3.27 mg·kg-1, 0.87 mg·kg-1, 3.43 g·kg-1, 381.27 mg·kg-1 and 500.86 mg·kg-1, respectively. From river bank to salt beach, the soil nutrient contents of TN, NO3 --N, TOC and TS increased gradually, while the contents of TOC, TN, NH4 +-Nand NO3 --N decreased gradually with depth in the soil profiles. The results of correlation analysis show that there are highly significant relationships between TOC and TS, NO3 --N as well as TN in soils. The soil salinity and pH are the determining factors for soil nutrient contents of TOC, TS, NO3 --N, TN and C/N ratio.