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Observations on carbon and nitrogen content of suspended matter in aheadwater stream in Hong Kong
Abstract： The total carbon(C) and total nitrogen(N) content of suspended matter in a small undisturbed headwater drainage basin in the New Territories of Hong Kong has been monitored. Mean C and N contents were 12.85 % and 0.99% respectively for 132 samples. Samples collected under stableflow conditions had mean C and N contents of 12.81% and 1.06% respectively. Stormflow samples had mean C and N values of 12.86% and 0.97% respectively,which were very similar to the levels observed under stableflow conditions. The mean C:N ratios of 12.47 and 13.39for stableflow and stormflow also reveal little difference according to hydrologic conditions. When all the data is considered little difference is observed in C and N according to the season. However, in winter there is a significant difference in C and N content between stable and stormflow samples. When C and N are plotted against water level the scattergraphs suggested that as stage increases the percentage of C and N in the suspended matter declines.Scattergraphs of C and N against suspended sediment concentration reveal a negative association. Comparison has been made between fresh leaf C, N and C/N ratio for trees and shrubs and the suspended matter. Fresh leaves do not appear to contribute significantly to suspended matter. The C/N ratio of suspended matter would also seem to exclude woody material and algae as sources of suspended matter. 作 者： M.R.Peart Guan Dong-sheng 作者單位： M.R.Peart(Department of Geography, University of Hong Kong, Hong Kong)Guan Dong-sheng(Department of Environmental Science, Sun Yatsen(Zhongshan) University,Guangzhou 510275, China)
期 刊： 環(huán)境科學學報(英文版) ISTICSCI Journal： JOURNAL OF ENVIRONMENTAL SCIENCES 年，卷(期)： 2004, 16(4) 分類號： X131.2 Keywords： carbon nitrogen suspended matter Hong Kong【Observations on carbon and nitrogen 】相關文章：