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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Acknowledgments
This research was supported by China PostDoc Scientific Fund (2005038473), Institute Scientific Fund of the Institute of Karst Geology (200703), China Geological Survey Project (1212010634806), China Natural Science Foundation (90202016), and UNESCO/IUGS International Geosciences Programme project (IGCP513). The authors are grateful to the anonymous reviewers and editors for their constructive comments and helpful suggestions. The authors also would like to thank Ms Wu Ge and Lu Ye for improving the manuscript.
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Zhang, C., Pei, J., Xie, Y. et al. Impact of land use covers upon karst processes in a typical Fengcong depression system of Nongla, Guangxi, China. Environ Geol 55, 1621–1626 (2008). https://doi.org/10.1007/s00254-007-1111-1
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DOI: https://doi.org/10.1007/s00254-007-1111-1