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The Influence of Cu and Ni Amendment on Potential Nitrification Rate for 17 Areas of Chinese Agricultural Soils

Author: SunJinWei
Tutor: ZhaoLiJun；HuangYiZong
School: Guangxi University
Course: Forest cultivation
Keywords: Agricultural soils Potential nitrification rates Cu Ni Leaching Non- leaching EC50
CLC: X53
Type: Master's thesis
Year: 2008
Downloads: 96
Quote: 0
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Abstract


With the soil heavy metal pollution has been increasing worldwide, the problems brought about by pollution and how pollution treatment has been more and more attention by people. Soil heavy metals in soil organisms will impact soil organisms under heavy metal stress will produce a different response. Nitrification is more sensitive to heavy metal pollution and its important role in the global nitrogen cycle, it has become one of the important indicators for people to evaluate the extent of heavy metal contamination. At present, Europe and the United States of terrestrial ecosystems ligand model of soil biological ligand model is proved feasible heavy metals of biological acute toxicity studies, and the country also has been in the water environment biological ligand model of aspects has made gratifying achievements. This paper studies the leaching and non-leaching conditions, different concentrations of copper (Cu) and nickel (Ni), 17 typical soil nitrification rate the following conclusions: (1) With the increase of Cu concentration 17 regional non-leaching and leaching potential of agricultural soil nitrification rate (PNR) decreased. Adding different concentrations of Cu, our 17 regional non-leaching farmland soil half inhibitory concentration (EC50) of 73.4 mg · kg -1 -2164.4 mg · kg -1 leaching agricultural soils EC50 of 34.4 mg · kg -1 -6000.6 mg · kg -1 . EC50 non-leaching farmland soil and soil pH, Mg and Ca content showed a significant positive correlation between; non-polluting potential nitrification rates (PNR 0 ) and soil viscosity (Clay <2μm) a negative correlation between Al content is positively correlated with the pH. Leaching of agricultural soils PNR 0 and Clay (<2μm), Al content was negatively correlated with the pH was positively correlated. (2) with the Ni concentration increased, decreased 17 regional non-leaching and leaching of agricultural soils PNR. China's 17 regions, with different concentrations of Ni non-leaching farmland soil EC50 of 69.7 mg · kg -1 -2330 mg · kg -1 , leaching farmland soil EC50 of 32.0 mg · kg -1 -2372mg · kg -1 . EC50 non-leaching farmland soil and soil pH, Ca content was a significant positive correlation between; the PNR 0 and Clay (<2μm) Al content was negatively correlated with pH, ??Ca content was positively correlation. Leaching soil PNR 0 and Clay (<2μm), Fe content, Al content was negatively correlated with pH, ??Ca content was positively correlated. (3) whether Cu or Ni contamination, leaching of agricultural soils than non-leaching farmland soil biological toxicity significantly reduced. The results of this study will be our study the toxicity of Cu and Ni and their controlling factors, and thus establish the foundation for the Biotic Ligand Model, also will lay a theoretical foundation for China's soil environmental monitoring.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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