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Journal of Applied Sciences
  Year: 2014 | Volume: 14 | Issue: 4 | Page No.: 301-308
DOI: 10.3923/jas.2014.301.308
 
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Distribution and Evolution of Soil Organic Carbon, Total Nitrogen and Isotopes in Shanghai, China

Xu Naizheng and Liu Hongying

Abstract:
The characteristics of soil organic carbon and nitrogen pools and changes in urban territories play a key role in the alteration of the global carbon biogeochemical cycles in the quickening urbanized world. The aim of this study is to assess the spatial distribution of soil organic carbon, total nitrogen and δ13C, δ15N signatures in different urbanized territories in Shanghai, China and provide information on evolution trend of C, N cycling with urban ecosystem evolving. The contents of organic carbon, total nitrogen and δ13C, δ15N in soil profiles (0~100 cm) of urban area vary in the ranges of 4.30-16.40, 0.50-1.80 g kg-1 and -26.72~-21.16%, 2.05~5.89%, respectively. Soil organic carbon, total nitrogen and 15N obviously accumulate while 13C is significantly depleted in the central urban area. The organic carbon, total nitrogen contents decrease with soil profiles depth increasing. The δ13C values increase from the top layer to a certain depth and then decrease. The carbon isotopic fractionation effects are more evident in the central urban area. The δ15N is at a higher value in the central urban area than the urbanized area. Soil organic carbon, total nitrogen and δ13C, δ15N signatures are correlated with urbanized periods of the studied urban ecosystem. Differences in different urbanized territories and associated environmental impacts are clearly reflected via C, N fractions and δ13C, δ15N signals. The data and information on spatial-temporal distribution and evolution in urban territories of Shanghai will be offered which may be useful to push forward C and N cycles research on urban soils.
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How to cite this article:

Xu Naizheng and Liu Hongying, 2014. Distribution and Evolution of Soil Organic Carbon, Total Nitrogen and Isotopes in Shanghai, China. Journal of Applied Sciences, 14: 301-308.

DOI: 10.3923/jas.2014.301.308

URL: https://scialert.net/abstract/?doi=jas.2014.301.308

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