Authors: Bai Yongqing*, Institute of Geographic Sciences and Natural Resources Research, CAS
Topics: Hazards, Risks, and Disasters, China, Arid Regions
Keywords: Standardised Precipitation-Evapotransporation Index (SPEI), spatio-temporal distribution of cultivated land, drought condition of farmland, the Breaks for Additive Season and Trend (BFAST) algorithm
Session Type: Paper
Start / End Time: 3:20 PM / 5:00 PM
Room: Napoleon A3, Sheraton, 3rd Floor
Presentation File: No File Uploaded
Drought was a worldwide natural disaster with a long-term effect on agricultural production and socioeconomic activities of countries. There was a huge geographical environmental differences in China mainland with vast territory and abundant resources. Simultaneously, the long-term economic development imbalance in China led to weak local ecological environment in centralized distribution area of agricultural cultivated land. The frequent occurrence of drought had a great impact on China's cultivated land and grain yield in all ages. The drought patterns and regional differentiation characteristics in agricultural cropland area of China could be cognized by both remote sensing monitor and ground observation, which could be of great scientific and practical significance for agricultural production. In this study, monthly spatio-temporal distribution of drought in China from 2001 to 2013 was calculated based on the Standardised Precipitation-Evapotransporation Index with remote sensing image and ground observation data. Then yearly spatio-temporal distribution of cropland from 2001 to 2013 in China was extracted based on the MODIS MCD12Q1 dataset and there were 156 monthly drought levels in the cropland region according to the overlaying of drought and agricultural land distribution. Lastly spatio-temporal change of drought in cultivated land in China was simulated by the Breaks for Additive Season and Trend algorithm.