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Journal of Geographical Sciences    2006, Vol. 16 Issue (1) : 69-77     DOI: 10.1007/s11442-006-0107-1
Climate and Environmental Change |
The impact of land use on soil properties in a karst agricultural region of Southwest China:a case study of Xiaojiang watershed, Yunnan
Jiang Yongjun
School of Resources &|Environmental Sciences, Southwest University, Chongqing 400715, China
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Abstract  

Supported by RS and GIS, the land use change from 1982 to 2003 were analyzed and the impacts of land use changes on pH value, organic matter, total N, total P, total K, available N, available P, and available K in soil of Xiaojiang watershed, a typical karst agricultural region of Yunnan Province, Southwest China were assessed. The following aspects are concluded. (1) The total land use converted during the past 20 years in Xiaojiang watershed covers an area of 610.12 km2, of which 134.29 km2 of forestland was converted into cultivated land, and 210 km2 of unused land was converted into cultivated land. (2) The rapid growth of population and the economic development were the main driving forces of land use change. (3) With the change in land use, the soil properties have been changed significantly. The pH, organic matter, total N, total P, total K, available N, available P and available K in soil in 1982 were 6.3, 38.02 g kg-1, 1.86 g kg-1, 1.63 g kg-1, 10.94 g kg-1, 114.42 g kg-1, 11.65 mg kg-1 and 64.69 mg kg-1g, respectively; and those in 2003 were 6.73, 25.26 g kg-1, 1.41 g kg-1, 0.99 g kg-1, 12.6 g kg-1, 113.43 mg kg-1, 11.11 mg kg-1 and 151.59 mg kg-1, respectively. Pared samples t-test of the tested indices of soil properties indicate that those indices have changed significantly during the last 20 years. But the soil properties changed differently, due to the differences in land use change. (4) Also, with the change in land use and management measures of soil, the modifications in soil properties which developed from carbonate rocks were more sensitive than those in the soil developed from sandstone.

Keywords karst agricultural region      land use change      soil properties      Xiaojiang watershed      Yunnan Province     
Fund:

Doctorate Foundation of Southwest University, No.SWNUB2005035; Open Foundation of Physical Geography of Southwest University, No.250-411109; Foundation of Science and Technology Committee of Chongqing, No.20027534; No.20048258; The project of Ministry of Land and Resources, No.200310400024

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Jiang Yongjun. The impact of land use on soil properties in a karst agricultural region of Southwest China:a case study of Xiaojiang watershed, Yunnan[J]. Journal of Geographical Sciences,2006, 16(1): 69-77.
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http://www.geogsci.com/EN/10.1007/s11442-006-0107-1     OR     http://www.geogsci.com/EN/Y2006/V16/I1/69
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