Assessment of Karst rocky desertification based on MODIS: Exemplified by Guizhou Province

doi:10.6046/gtzyyg.2019.04.30

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Abstract

Monitoring the spatial pattern and dynamic change of Karst rocky desertification has an important significance in Karst areas. In this study, the Karst rocky desertification evaluation model was established in Guizhou Province, which based on vegetation fractional coverage and degree of exposed bedrock using multi-temporal MODIS data, slope and population density as evaluation factors. The contribution of four factors was compared to accomplish the judgment matrix and calculate the weight by analytic hierarchy process. Karst rocky desertification evaluation model was established through consistency check. By this evaluation model, the spatial patterns of Karst rocky desertification and characteristics of conversion in different degree of desertification were acquired, the spatial-temporal evolution and dynamic change of Karst rocky desertification were analyzed in the period of 2007—2016. Some conclusions have been reached: ①Karst rocky desertification was improved dramatically from 2007 to 2016. The proportion of moderate rocky desertification and severe rocky desertification was 55.67% and 40.53% respectively in 2010 but was 79.71% and 17.35% in 2016. ②Moderate rocky desertification was the intermediary process of severe rocky desertification transform to light rocky desertification. It can firstly transform severe rocky desertification to moderate rocky desertification and then transform to light rocky desertification. ③Moderate rocky desertification and light rocky desertification were active, whereas severe rocky desertification was stable and the conversion rate was low.

Keywords Karst rocky desertification evaluation model of rocky desertification rocky desertification of Guizhou Province MODIS

TP79

Corresponding Authors: Yunlan GUAN E-mail: guan8098@163.com

Issue Date: 03 December 2019

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	Linlin WU
	Yunlan GUAN
	Jiawei LI
	Chenxin YUAN
	Rui LI

Cite this article:

Linlin WU,Yunlan GUAN,Jiawei LI, et al. Assessment of Karst rocky desertification based on MODIS: Exemplified by Guizhou Province[J]. Remote Sensing for Land & Resources, 2019, 31(4): 235-242.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2019.04.30 OR https://www.gtzyyg.com/EN/Y2019/V31/I4/235

Tab.1 MODIS 500 m surface reflectance 8-days composition product

Tab.2 Maximum and minimum of NDVI

Tab.3 Proportion criteria

Tab.4 Judgment matrix and weight

Tab.5 Hierarchy standard of rocky desertification extent

Fig.1 Classification of rocky desertification extent

Fig.2 Change detection of Karst rocky desertification

Fig.3 Conversion distribution of rocky desertification

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