The impact of urban land expansion on soil quality in rapidly urbanizing regions in China: Kunshan as a case study |
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Authors: | Jian Zhang Lijie Pu Buzhuo Peng Zhonggui Gao |
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Institution: | (1) School of Geographic and Oceanographic Sciences, Nanjing University, Hankou Road #22, 210093 Nanjing, People’s Republic of China |
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Abstract: | At a stage of rapid economic development and urbanization in China, most cities are faced with serious problems caused by
environment deterioration such as pollution, space press, afforestation degradation, and disordering. Kunshan City, one of
the most economically vigorous regions in China, has suffered a more prominent conflict between urbanization and environmental
safety. In this paper, urban land expansion in Kunshan City in the Yangtze River Delta was measured with reference to the
Landsat data recorded in 1982, 1991, 1995, and 2003 and change in land-use pattern in 1981, 1991, 1995, and 2004 as well as
that in nutrients in soils of different purposes between the periods were analyzed to study the effect of urban land-use expansion
on soil characteristics. To get a better understanding of soil nutrients, heavy metal content, and pollution, on-the-spot
investigation, sampling and laboratory analysis were all conducted, and the geo-accumulation factors and revised Nemerow comprehensive
index method were adopted for evaluation of the findings. The results show that the content of organic matter, total nitrogen,
rapidly available nitrogen, and available phosphorus in the soil (except available potassium) all increased, and the average
content of As, Cd, Cr, Cu, Pb, Ni, Hg, Se, and Zn prove to be 8.61, 0.12, 83.53, 32.49, 29.93, 30.45, 0.27, 0.24, and 93.3 mg kg−1, respectively, showing degradation in soil quality. |
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