Rocky desertification is a serious threat to socioeconomic development and the ecological security of karst areas. The control of rocky desertification has therefore become a major concern of both the Chinese government and local populations living in karst areas. In this paper, we used the national evaluation system for monitoring rocky desertification, and adjusted relevant indices. For example, we improved the system’s base rock exposure index with Normalized Difference Rock index (NDRI), substituted a soil erosion index for soil depth, and from these obtained the categories and spatial distribution of rocky desertification. We also studied the main factors and functional mechanisms of rocky desertification with consideration given to natural geographic conditions such as soil, physiognomy, elevation, slope and river network density, and, also human interference factors such as population density, GDP, population distribution, and from these got spatial distribution characteristics and influencing factors of rocky desertification in Qiandongnan prefecture. Results indicate that the primary soil types of rocky desertification in the research areas include yellow, limestone and paddy soils. These rocky desertification areas are more likely to contain limestone soil than purple soil, and least likely to contain paddy soil. The distribution of moderate or severe rocky desertification in areas with moderate to steep slope is 40%, where sloping agricultural land comprises a large proportion of the total. Rocky desertification is widely distributed in regions with precipitation between 1000-1200 mm, and this precipitation is the main factor causing greater soil erosion in limestone soil base and sloping agricultural areas. Moreover, desertification is closely related to the distribution of residential areas, population density, poverty and sloping agricultural land
DOU Hongtao, ZHEN Lin, LI Haiping
. Spatial Distribution Characteristics of Rocky Desertification in Qiandongnan Prefecture of Guizhou Province[J]. Journal of Resources and Ecology, 2017
, 8(4)
: 422
-432
.
DOI: 10.5814/j.issn.1674-764x.2017.04.015
[1] Cao J., Yuan D., Tong L.., et al . 2015. An overview of karst ecosystem in Southwest China: current state and future management. Journal of Resources & Ecology 6(4): 247-256.
[2] Cao W. Z. 1995. A study on K-supplying ability of some soil types in Guizhou southwest China. Journal of Agricultural Sciences 4: 60-65. (in Chinese).
[3] Chen H. 2013. Spatial variation of soil properties in slope farmland of rocky desertification area at small scale. Southwest University. (in Chinese).
[4] Fu B. J. 2013. Research on ecological regionalization in China. Science Press . (in Chinese).
[5] Gao J. X. 2014. Degraded mountain ecosystem assessment and restoration technologies in southwestern of China. Science Press . (in Chinese).
[6] Hu B. Q., Huang Q .Y, Liao C M. 2004. Spatial correlation analysis of karst rocky desertification and soil type based on RS & GIS—A case study at Yao Autonomous County of Guangxi Province. Bulletin of Soil and Water Conservation 24(5): 67-70.
[7] Huang Q. H., Cai. L. 2016. Mapping karst rock in southwest China. Mountain Research & Development 29(1): 14-20.
[8] Jiang Z. C. 2011. Study on karst rocky desertification and comprehensive control in Guangxi Province. Beijing: Science Press. (in Chinese).
[9] Jiang Z. C., Luo W. Q., Tong L. Q. 2016. Evolution features of rocky desertification and influence factors in karst areas of southwest China in the 21st century. Carsologica Sinica 5: 461-468. (in Chinese).
[10] Kovačič G., Ravbar N. 2013. Analysis of human induced changes in a karst landscape - the filling of dolines in the Kras plateau, Slovenia. Science of the Total Environment 447(1): 143-151.
[11] Lan A.. J, Xiong K N, An Y L. 2001. Analysis on driving factors of Karst rock desertification—with a special reference to Guizhou Province. Bulletin of Soil and Water Conservation 21(6): 19-23. (in Chinese).
[12] Li C. Y., Kuang S.. D, Li Z. Z., et al . 2007. RS monitoring technology in karst rocky desertification. Journal of Guilin University of Technology 27(1): 30-35. (in Chinese).
[13] Li Song, Luo X. Q. 2015. Study on monitoring of karst rock desertification using multi-temporal remote sensing. Chinese Agricultural Science Bulletin 31(11): 262-267. (in Chinese).
[14] Liu G. C. 2008. Purple soil erosion and its prevention and control technology. Chengdu: Sichuan University Press. (in Chinese).
[15] Liu S. L., Guo X. D., Fu B. J., et al . 2006. Effects of road networks on land ecological security: A case study in a transitional area of the Loess Plateau. Arid Zone Research 23(1): 126-132. (in Chiese).
[16] Lou W. J. 2016. Quantitative evaluation and analysis of rocky desertification remote sensing in karst mountainous area based on landscape unit. Guizhou Normal University. (in Chinese).
[17] Luo K, Shao K. 2012. The value of the Miao people's traditional ecological knowledge for a solution to rocky desertification in Mashan. Journal of Resources & Ecology 2(Mar 2011): 34-45.
[18] Tang L. H., Xu J. X., Zhu Q. Q., et al . 1983. Content and distribution of microelements in yellow earth. Acta Pedologica Sinica 20(2): 186-196. (in Chinese).
[19] Tong L. Q. 2003. A method for extracting remote sensing information from rocky desertification areas in southwest China. Remote Sensing for Land &Resources 4: 35-38. (in Chinese).
[20] Tu Y. 1989. Preliminary study on karst forests in Guizhou. Carsologica Sinica. 4: 005 .
[21] Wan H. F., Wu Y. X,. Long Y C. 2015. Research on rocky desertification in southwest karst region of China. Forest Inventory and Planning 40(5): 137-142. (in Chinese).
[22] Wang S. J. 2002. Concept deduction and its connotation of karst rocky desertification. Carsologica Sinica 21(2): 101-105. (in Chinese).
[23] Xiong K. N., et al . 2002. A typical study on RS-GIS of karst rock desertification—setting Guizhou Province as the study case. Beijing: Geological Publishing House . (in Chinese).
[24] Xiong P. S., Yuan D .X., Xie S. Y. 2010. Progress of research on rocky desertification in south China karst mountain. China Karst 29 (4): 355- 362. (in Chinese).
[25] Yang Q. Q., Li S. Q., Cai L, et al . 2011. Progress of research on extracting methods of rock desertification from RS image. Environment and Development 12: 95-98. (in Chinese).
[26] Yi S. 2008. Based on RS and GIS analysis of vegetation in karst area. Guangxi Normal University . (in Chinese).
[27] Yuan D. X. 1997. Rock desertification in the subtropical karst of south China. Berlin:Gerbuder Borntraeger.
[28] Yue Y. M., Wang K. L., Zhang B., et al . 2010. Progress of remote sensing study on estimation method of rocky desertification evaluation index. Regional Agricultural Eco-Centre. (in Chinese).
[29] Zhang W. Y., Wang B. T. 2015. Discussion on classification and gradation of karst rocky desertification in Guizhou Province. Journal of Nanjing Forestry University (Natural Sciences Edition) 2: 148-154. (in Chinese).
[30] Zhao L. P. 2015. Temporal and spatial evolution characteristics of rocky desertification in karst area based on MODIS data. Beijing: China University of Geosciences. (in Chinese).
