JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (5): 853-866.doi: 10.11849/zrzyxb.20170480

• Resource Evaluation • Previous Articles     Next Articles

Spatio-temporal Distribution Characteristics and Influencing Factors of Drought in Anhui Province Based on CWSI

WANG Zuo1,2, WANG Fang1,2, ZHANG Yun1,2   

  1. 1. School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China;
    2. Engineering Technology Research Center of Resources Environment and GIS, Anhui Province, Wuhu 241003, China
  • Received:2017-05-25 Revised:2017-09-04 Online:2018-05-20 Published:2018-05-20
  • Supported by:
    National Natural Science Foundation of China, No. 41501379.

Abstract: Anhui is one of the agricultural provinces and an important commodity grain base in China. Due to factors such as natural geographical location, drought occurs frequently in Anhui Province. Based on the MOD16 product, and the method of crop water stress index (CWSI) combined with meteorological data and MOD13 data, the spatial and temporal distribution characteristics and influencing factors of drought in Anhui Province from 2000 to 2014 were analyzed. The results showed that: 1) Crop water stress index based on MOD16 product can be used to monitor drought in Anhui Province. 2) During 2000-2014, the average annual CWSI for Anhui Province was 0.524, the maximum value being 0.569 in 2011 and the minimum value being 0.458 in 2003, which showed a weak increasing trend and had a strong spatial heterogeneity. In addition, the average CWSI varied among cities. The area between Huaibei plain and Jianghuai region showed a significant increasing trend, while the mountain areas in south Anhui showed a significant downward trend. 3) The monthly CWSI during one year in Anhui Province showed the single-valley trend, reaching its maximum of 0.66 in March and the minimum of 0.27 in August. Besides, there were obvious seasonal differences. Huaibei plain was prone to spring, autumn and winter drought, Jianghuai hills was prone to spring and autumn drought, and area along the Yangtze River was prone to spring drought. 4) The CWSI varied for different land covers in Anhui Province. Forest land and grassland showed the single-valley pattern with the monthly average maximum in March, while the towns and cultivated land showed the multimodal pattern with the maximum monthly mean in June. 5) Rainfall, temperature and NDVI were closely related to CWSI. In areas with more rainfall and lower temperature, the NDVI was higher, moreover, the CWSI was smaller and the drought degree was lighter, which indicated that rainfall played the most important role in the change of CWSI.

Key words: CWSI, Anhui Province, drought, land use

CLC Number: 

  • S423