Spatio-temporal change characteristics of rubber forest phenology in Hainan Island during 2001—2015
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摘要: 为分析海南岛橡胶林物候特征,探究热带森林植被物候变化特征,本研究利用MODIS归一化植被指数( normalized difference vegetation index,NDVI) 数据,采用Savitzky-Golay( S-G) 滤波法重建2001—2015年的MODIS NDVI时间序列,利用动态阈值法和典型样区提取海南岛橡胶林物候,分析了橡胶林物候的时空变化特征。结果表明: 15 a间海南岛橡胶林春季在1月中旬—3月下旬开始展叶,秋季在11月中旬—12月下旬开始落叶,生长季长度约7~10个月; 在时间尺度上,15 a间橡胶林物候没有显著性变化,春季物候每年提前约0.94 d,秋季物候每年延迟约0.84 d,生长季长度每年延长约1.79 d; 在空间尺度上,15 a间春季物候显著提前地区主要有白沙黎族自治县、屯昌县、琼中黎族苗族自治县、万宁市和琼海市等,变化幅度为-1.8~-0.1 d/a,秋季物候显著延迟地区在儋州市、白沙黎族自治县、屯昌县、琼中黎族苗族自治县、琼海市、万宁市、乐东黎族自治县、三亚市和保亭黎族苗族自治县等地,变化幅度为0.5~2.7 d/a,生长季长度显著延长区域主要分布在儋州市和白沙黎族自治县等地,变化幅度为0.2~0.8 d/a,落叶期开始日显著延迟是橡胶林物候变化的主要特征。
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关键词:
- 橡胶 /
- 物候 /
- MODIS NDVI /
- 海南岛 /
- 时空变化
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.-
Key words:
- rubber /
- phenology /
- MODIS NDVI /
- Hainan Island /
- spatio-temporal change
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