The relations between land use and karst rocky desertification in a typical karst area,China |
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Authors: | Yang-bing Li Jing-an Shao Hua Yang Xiong-yong Bai |
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Institution: | (1) School of Geography and Biology, Guizhou Normal University, Guiyang, 550001, Guizhou Province, People’s Republic of China;(2) Geography Science Institute of Chongqing Normal University, Chongqing, 400047, People’s Republic of China;(3) Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, 100101, People’s Republic of China |
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Abstract: | Karst rocky desertification (KRD) is one major type of desertification which is under irrational human impact on the vulnerable
eco-geo-environment. In this study, Zhudong fengcong rocky desertification landscape was selected to investigate the land
use types distribution law in different rock types and the KRD land in different land use types. KRD data was determined by
user–computer interactive interpreting method from Aster images in 2004, according to the exposed ratio of rock, the coverage
of vegetation and soil in 0.2 km2 unit, integrating with land utilizing present situation map, hydrogeology map, relief map, vegetation map, soil distribution
map, as well as the practical investigation and the population census datum in 2002. Results showed that the occurrence ratio
of KRD land is different in land use types and rocky assemblages obviously; land cover has a strong impact upon KRD. The sloping
cropland distributed in homogenous limestone has a higher occurrence ratio of light KRD, secondly, is in the limestone interbedded
with clastic rock. Light KRD land was dominated by shrubland, and sloping cropland accounts for 11.67% of it, moderate KRD
land was dominated by moderate coverage grass slopes, strong and extremely strong KRD was dominated by rocky dry land which
is difficult to use. |
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Keywords: | Karst rocky desertification Land use impacts Panxian county Guizhou province |
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