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Spatiotemporal analysis of drought in sugarcane planting areas of Guangxi by remote sensing |
QIN Wen1,2( ), HUANG Qiuyan1,3(), QIN Zhihao4, LIU Jianhong1, WEI Gaoyang1 |
1. School of Geography Science and Planning, Nanning Normal University, Nanning 530001, China
2. Scientific Research Academy of Guangxi Environmental Protection, Nanning 530022, China
3. Key Laboratory of Environmental Evolution and Resource Utilization of Beibu Gulf, Nanning Normal University, Nanning 530001, China
4. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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Abstract Guangxi is the most important sugarcane producing area in China. Remote sensing of drought in sugarcane planting areas is of great practical significance to decision-making for the anti-drought campaign in Guangxi where sugarcane planting is mainly on the farmland without irrigation guarantee. This study intends to examine the issue of remote sensing monitoring of drought in sugarcane planning areas in Guangxi. MODIS data product MOD16/MYD16 was used to calculate the drought intensity index (DSI) in Guangxi sugarcane planting areas for a period from 2002 to 2018. On the basis of this calculation, the spatiotemporal characteristics of different drought grades in Guangxi sugarcane planting areas were analyzed. In order to reveal the changing trend of the drought severity in the sugarcane planning areas, three methods, i.e. unary linear regression, Mann-Kendall trend test and Hurst index, were used in the study to analyze the change trend of drought in the sugarcane planting areas of Guangxi. The results showed that the drought in Guangxi during the period from 2002 to 2018 mainly happened in the center, the southeast, the southwest, and the northwest sugarcane areas. The annual average of DSI was -0.59 during the period. Very high DSI was observed in two years, i.e. 2010 and 2002, implying that sugarcane planting in Guangxi experienced the most severe drought in the two years. Very low DSI was seen in 2016, indicating the minimal impact of drought on the planting areas this year. The change of DSI in the sugarcane planting areas of Guangxi showed a trend of a slight decrease from 2002 to 2018, with an annual rate of -0.07%. In terms of the spatial center of gravity of drought, the center of gravity of drought areas in different growth periods showed a trend of expansion from the center to the northwest, and the path of gravity center shift was as follows: central planting area > southwest planting area > northwest planting area. From the perspective of years, DSI in each year revealed a remarkable fluctuation during the period in question. Sharp changes in DSI might also be seen in some years, implying that drought had variability among years in Guangxi. The spatiotemporal variation of drought in Guangxi is obviously related to the climate change in the areas. Therefore we believe that sugarcane planting in Guangxi might continuously face the challenges from the frequent occurrence of the drought of various grades as a result of future climate change. Remote sensing monitoring of the drought can provide useful information on drought events and their dynamics for anti-drought campaigns to reduce the impact of drought on sugarcane planting in Guangxi.
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DSI
shift of the center of gravity
spatiotemporal evolution of drought
sugarcane
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Corresponding Authors:
HUANG Qiuyan
E-mail: qinw0717@foxmail.com;hqy@nnnu.edu.cn
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Issue Date: 20 June 2022
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Vol. 34
