Impact of land use covers upon karst processes in a typical Fengcong depression system of Nongla, Guangxi, China |
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Authors: | Cheng Zhang Jianguo Pei Yunqiu Xie Jianhua Cao Lanling Wang |
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Institution: | (1) Karst Dynamics Laboratory, MLR, Institute of Karst Geology, CAGS, 541004 Guilin, Guangxi, People’s Republic of China;(2) Daqing Oilfield Engineering C., Ltd, Daqing, People’s Republic of China |
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Abstract: | The direction and intensity of karst processes can be deeply affected by soil physical and chemical variations which were
resulted from land use. Taking Nongla Fengcong depression area, Mashan County, Guangxi as an example, authors discussed the
impact of land use on karst processes based on the data of field limestone tablet. The results showed that the corrosional
rates at varied soil depth are quite different. Corrosional rate in woodland and orchard is mostly bigger than 20 mg/a, which
is much higher than that in tilled land and shrub. Generally, corrosional rate decreased from orchard, woodland, tilled land,
fallow land and shrub successively, in which soil organic matter (OM) and soil pH are two major controlling factors: corrosion
process is controlled remarkably by soil OM in woodland and orchard. The higher the organic matter content is and the less
the pH value is, the higher the corrosional rate is. Owing to lower organic matter content, the corrosional rate is mainly
affected by soil CO2 in tilled land and shrub. |
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Keywords: | Land use Karst processes Corrosional rate Nongla Guangxi China |
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