Using principal component analysis and annual seasonal trend analysis to assess karst rocky desertification in southwestern China

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Using principal component analysis and annual seasonal trend analysis to assess karst rocky desertification in southwestern China
	Xiao, Yang; Zhang, Zhiming; Ouyang, Zhiyun; Xiao, Yi; Xu, Weihua
刊名	ENVIRONMENTAL MONITORING AND ASSESSMENT
	2017-06-01
卷号	189 期号:6 页码:-
关键词	Modis Normalized Difference Vegetation Index Fractional Vegetation Cover Median Trend Analysis Karst Rocky Desertification
英文摘要	Increasing exploitation of karst resources is causing severe environmental degradation because of the fragility and vulnerability of karst areas. By integrating principal component analysis (PCA) with annual seasonal trend analysis (ASTA), this study assessed karst rocky desertification (KRD) within a spatial context. We first produced fractional vegetation cover (FVC) data from a moderate-resolution imaging spectroradiometer normalized difference vegetation index using a dimidiate pixel model. Then, we generated three main components of the annual FVC data using PCA. Subsequently, we generated the slope image of the annual seasonal trends of FVC using median trend analysis. Finally, we combined the three PCA components and annual seasonal trends of FVC with the incidence of KRD for each type of carbonate rock to classify KRD into one of four categories based on K-means cluster analysis: high, moderate, low, and none. The results of accuracy assessments indicated that this combination approach produced greater accuracy and more reasonable KRD mapping than the average FVC based on the vegetation coverage standard. The KRD map for 2010 indicated that the total area of KRD was 78.76 x 10(3) km(2), which constitutes about 4.06% of the eight southwest provinces of China. The largest KRD areas were found in Yunnan province. The combined PCA and ASTA approach was demonstrated to be an easily implemented, robust, and flexible method for the mapping and assessment of KRD, which can be used to enhance regional KRD management schemes or to address assessment of other environmental issues.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39147]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Xiao, Yang,Zhang, Zhiming,Ouyang, Zhiyun,et al. Using principal component analysis and annual seasonal trend analysis to assess karst rocky desertification in southwestern China[J]. ENVIRONMENTAL MONITORING AND ASSESSMENT,2017,189(6):-.
APA	Xiao, Yang,Zhang, Zhiming,Ouyang, Zhiyun,Xiao, Yi,&Xu, Weihua.(2017).Using principal component analysis and annual seasonal trend analysis to assess karst rocky desertification in southwestern China.ENVIRONMENTAL MONITORING AND ASSESSMENT,189(6),-.
MLA	Xiao, Yang,et al."Using principal component analysis and annual seasonal trend analysis to assess karst rocky desertification in southwestern China".ENVIRONMENTAL MONITORING AND ASSESSMENT 189.6(2017):-.