Distribution of acid-volatile sulfur(AVS) and the simultaneously extracted metals(SEM,including Pb,Zn,Cu,Cd,and Ni) along the sediment profiles at five locations in the Zhujiang River estuary have been studied in October 2003.Of the five sampling locations,Nos.
Distribution and fractions of organic carbon (C) in sediment profiles of 3 types of wetland ecosystems (peat fen, humus marsh and marshy meadow) were analyzed.
g·kg~(-1), and the maximum value was 6.66? g·kg~(-1). TP contents in sediment profiles showed that P in surface layers was much higher than that in bottem layers and decreased rapidly with depth from the top layers (0～10?cm).
Wetland is recognized as a large reservoir of organic carbon(C)in terrestrial ecosystems. In this study,the density and variations of organic C in the sediment profiles(totally 16) of the 3 types of wetlands in Sanjiang Plain,Northeast China was investigated.
There are significant positive correlations between organic carbon and water content in sediment profiles of the same type wetland(p<0.01;R~2=0.8276,0.9917,0.9916 and 0.9782 for cultivated wetland,fen,marsh and marshy meadow,respectively).
Eight sediment cores collected with gravity corer and sediment profiles dug by handed tools from the EBFZ marsh downstream of the Huolin River were studied with high resolution distribution of heavy metal (Cu, Zn, Cr, Ni, Co, Pb, Fe, Mn), pH, TOC and TN.
From March in 2005 to August in 2005, the concentration , distribution , transportation and fate of mercury species in lake water columns, lake tributaries water, sediment profiles and fish from Aha reservoir were measured and researched.
By combining the research on the radionuclide timing and the sediment granularity, the analyzed results of the sediment profiles in high resolving power show that the basic composition of the swampy profiles is dominated by silt and sand, and the change of the sedimentary environment is frequent.
Linearity was evident even at low porewater concentrations for mangrove sediment, according to isotherms based on KCl extractions on untreated sediment profiles.
To study whether airborne pollution can be detected in overbank sediments, samples collected from five overbank sediment profiles in eastern Finnmark, Norway, at 1 cm depth intervals, were subjected to chemical analysis and 210Pb dating.
It is suggested that the recent lake sediment profiles contain deposited magnetic minerals and atmospherically derived fly ash from industrial processes.
It is suggested that the recent lake sediment profiles contain deposited magnetic minerals and atmospherically derived fly ash from industrial processes.
A process of the sand landoccuring and development is discus-sed according to a number of sediment profiles in the Quaternary in east—south part of Mu Us sand land.It's pointed out that the development ofthe sand land geomorphology has a more-fluctuate process:lake—sand—lakeand marsh,and the process is correspond to the evolution of natural environ-ment.Because of this,man's environment is made more hazard.
Typhoon wave affecting the eastern Chongming flat is landing on between the middle part of Zhejiang coast and the Changjiang Estuary. and going north along the coast of the Changjiang River. The typhoon can induce water rising. The No. 8310 typhoon had made water rise of 1. 33 m at Hengsha. Based on the long- term observations at Sheshan Island oceanographic station, the maximum wave height probability of one time over 100 years is 5.6 m. During the No. 8310 typhoon, all the observable piles had been scoure...
It has long been proved that the loess stratigraphy bears a variety of information on past global changes. The alternative loess-palaeosol sequence is a well preserved materialized record of the glacial-interglacial cycles, which is now confirmed by various proxy climatic indices obtained from lots of loess profiles on the Loess Plateau of China. Much attention has been paid to the studies of the late Pleistocene loess stratigraphy in past decade aince it represents the climatic change of the last int...
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