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Spatio-temporal change characteristics of rubber forest phenology in Hainan Island during 2001—2015 |
HU Yingying1,2(), DAI Shengpei1,2(), LUO Hongxia1,2, LI Hailiang1,2, LI Maofen1,2, ZHENG Qian1,2, YU Xuan1,2, LI Ning3 |
1. Institute of Scientific and Technological Information, Chinese Academy of Tropical Agricultural Sciences/Key Laboratory of Applied Research on Tropical Crop Information Technology of Hainan Province, Haikou 571101, China 2. Key Laboratory of Agricultural Remote Sensing, Ministry of Agriculture and Rural Affairs, Beijing 100081, China 3. Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences/Danzhou Hainan, Tropical Agro-Ecosystem, National Observation and Research Station, Haikou 571101, China |
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Abstract To analyze the phenological characteristics of the rubber forest in Hainan Island and to explore the phenological change characteristics of tropical forest vegetation, this study reconstructed the 2001—2015 MODIS NDVI time series using the Savitzky-Golay (S-G) filtering method based on the MODIS normalized difference vegetation index (NDVI) data. Then, this study extracted the phenological parameters of the rubber forest using the dynamic threshold method and typical sampling areas. Finally, this study analyzed the spatio-temporal changes in the phenological characteristics of the rubber forest. The results are as follows. During 2001—2015, the rubber forest started its foliation season mainly from mid-January to late March in spring and started its defoliation season from mid-November to late December in autumn, with the growing season lasting for about 7~10 months. On the time scale, the phenological characteristics did not significantly changed in the 15 years. Specially, the spring phenology occured about 0.94 days earlier, the autumn phenology showed an about 0.84 days delay, and the growing season was prolonged for about 1.79 days every year. On a spatial scale, the regions where the spring phenology occurred significantly earlier in the 15 years primarily included Baisha Li Autonomous County, Tunchang County, Qiongzhong Li-Miao Autonomous County, Wanning City, and Qionghai City, with a changing rate of -1.8~-0.1 d/a. The areas with a significant delay in autumn phenology included Danzhou City, Baisha Li Autonomous County, Tunchang County, Qiongzhong Li-Miao Autonomous County, Qionghai City, Wanning City, Ledong Li Autonomous County, Sanya City, and Baoting Li-Miao Autonomous County, with a changing rate of 0.5~2.7 d/a. The areas where the growing season was significantly prolonged mainly included Danzhou City and Baisha Li Autonomous County, with a changing rate of 0.2~0.8 d/a. The main characteristic of phenological changes of the rubber forest is the significant delay in the start date of the defoliation season.
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Keywords
rubber
phenology
MODIS NDVI
Hainan Island
spatio-temporal change
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Corresponding Authors:
DAI Shengpei
E-mail: hyy1992@catas.cn;shengpeidai@catas.cn
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Issue Date: 14 March 2022
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