Discussion on desertification of humid region in southern China
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&&&&DOI: 10.18306/dlkxjz.
Ecology and Environment
Discussion on desertification of humid region in southern China
Yuanliang JIN,Hua PENG(),Luobin YAN,Yuewu XIANG,Xiangyu WANG
School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China
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Abstract&&Desertification is a serious problem worldwide that has environmental and socioeconomic consequences. Desertification research has important significance for protecting the environment and for regional sustainable development. Based on an examination of the connotation of desertification we suggest that desertification not only are caused by human disturbance superimposing on climatic drought in dryland areas of the north, but also can be a result of extreme land degradation due to soil erosion superimposing on physical drought effect in southern humid areas. This study compared different aspects of the desertification processes in dry and humid areas, including material base, climatic conditions, influencing factors, formation forces, core functions, and land surface processes. Finally, we used red beds area of southern China as an example to analyze red beds land degradation by combining on-the-spot investigation and vegetation cover (VFC) data derived from Landsat TM images in . The results show that under the impact of repeated human interference and natural factors, there is a clear trend of vegetation change, topsoil loss, and rock weathering, which produce desert-like landscape. The degradation process in red beds is similar to the Karst rocky desertification and land degradation of red soil in hilly areas, but whether this type of extreme land degradation that took place in the humid area of southern China is "desertification" needs further studying.
Corresponding Authors:
Hua PENG&&&
&E-mail: eesph@mail.
Issue Date: 17 July 2015
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Cite this article: &&
Yuanliang JIN,Hua PENG,Luobin YAN, et al. Discussion on desertification of humid region in southern China[J]. PROGRESS IN GEOGRAPHY,
): 772-780.
&&&&&OR &&&&
Fig.1&&Drought and resulting land degradation in ecologically fragile areas
Fig.2&&The three ecologically fragile zones in southern humid area of China (Data from the China Atlas of Physical Geography (Map Publishing House, 1984) and research findings from Peng et al, 2011)
Tab1&&Comparison of traditionally defined desertification and land degradation in humid areas
Fig.3&&Change of plant communities and soil properties under different succession stages
Fig. 4&&Red beds desertification classification based on vegetation coverage
Fig.5&&Desertification of Nanxiong basin red beds soft rock area, (Nanxiong City)
Tab. 2&&Percentage of varying degrees of red bed desertification in Nanxiong/%,
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