| Biology and Soil |
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| Change of Soil Nutrient in Process of Rocky Desertification in Karst Mountainous Area of North Guangdong |
| HUANG Jin-guo1, LI Sen1,2, WEI Xing-hu1, WANG Xi-zhi1 |
1.Department of Resources and Environmental Science, Foshan University, Foshan 528000, Guangdong, China;
2.College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China |
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Abstract For exploring the impacts of rocky desertification process on soil nutrient change and understanding the laws of soil nutrient variation in rocky desertification process in karst mountainous area of North Guangdong,a margin area of rocky desertification region in Yanbei town and Jiangying town was selected as study site. According to the different levels of rocky desertification: slight rocky desertification, moderate rocky desertification, severe rocky desertification, and very severe rocky desertification, the surface soil layer(0—20 cm) samples were investigated and analyzed. Results drawn from this case study are listed as follows: There is a close relationship between rocky desertification process and soil nutrient condition, and with the development of the rocky desertification, the contents of soil organic matter, total N, available N, available P and available K show a obviously decreasing trend(P<0.05). Simultaneously, soil became more and more infertile. The decrease of soil nutrient contents shows a relation of positive feedback with rocky desertification process, and there is consistency in the degradation direction and synchronism in the degradation process.
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Received: 27 June 2011
Published: 20 January 2012
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2012, Vol. 32 
