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Remote Sensing for Land & Resources    2020, Vol. 32 Issue (1) : 154-161     DOI: 10.6046/gtzyyg.2020.01.21
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Relative roles of climate changes and human activities in vegetation variables in Hainan Island
Hongxia LUO1,2, Shengpei DAI1,2, Maofen LI1,2, Yuping LI1,2, Qian ZHENG1,2, Yingying HU1,2
1. Institute of Scientific and Technical Information, Chinese Academy of Tropical Agricultural Sciences/ Key Laboratory of Practical Tropical Crop Information Technology in Hainan, Haikou 570000, China
2. Key Laboratory of Agricultural Remote Sensing, Ministry of Agriculture, Beijing 100100, China
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Abstract  

Using MODIS normal difference vegetation index (NDVI) data from 2001 to 2015 and climate data acquired from 7 meteorological stations in Hainan Island, the authors analyzed vegetation variability under the influence of climate variations and human activities based on residual analysis method, unary trend curve regression model and relative role analysis method in Hainan Island. The results showed that NDVI observed by remote sensing (MODIS NDVI) increased over the past 15 years with a rate of 0.024 per ten years in Hainan Island. The proportions of increasing vegetation and decreasing vegetation areas were 77.77% and 22.23%, respectively. As identified by remote sensing observations in Hainan Island, the relative roles of climate changes and anthropogenic activities in vegetation increase areas were 31.04% and 68.96%, while the roles of climate variations and human activities in vegetation decrease areas were 35.03% and 64.97%, respectively, indicating that human activities played a major role in vegetation changes. The area of increased vegetation mainly influenced by human activities (relative role >50%) accounted for 80.79% of the whole increase vegetation area, which was associated with the large-scale rubber plantation in these areas. In contrast, the area of reduced vegetation mainly induced by human activities (relative role > 50%) accounted for 75.59% of the reduced vegetation regions, which may be induced by the increased urbanization and urban expansion in coastal regions. On the whole, climate changes could promote the vegetation growth, whereas human activities played a greater role in the vegetation increasing than in the vegetation decreasing.
Keywords climate changes      human activities      relative role      Hainan Island     
:  TP79  
Issue Date: 14 March 2020
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Hongxia LUO
Shengpei DAI
Maofen LI
Yuping LI
Qian ZHENG
Yingying HU
Cite this article:   
Hongxia LUO,Shengpei DAI,Maofen LI, et al. Relative roles of climate changes and human activities in vegetation variables in Hainan Island[J]. Remote Sensing for Land & Resources, 2020, 32(1): 154-161.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.01.21     OR     https://www.gtzyyg.com/EN/Y2020/V32/I1/154
Fig.1  Study area
气候指标 相关系数
年均气温 -0.253*①
年均降水量 0.667**
干燥度指数 -0.196
生物温暖指数 -0.253
生物干湿度指数 0.559*
Tab.1  Correlation coefficients between climatic factors and NDVI
Fig.2  Correlation coefficients between main climate factors and NDVI
植被
变化		 情景 Slope
(NDVIC)		 Slope
(NDVIH)		 气候变化的相对作用/% 人类活动的相对作用/% 说明
植被增加区 1 >0 >0 CNDVICNDVI+HNDVI×100 HNDVICNDVI+HNDVI×100 气候变化和人类活动共同作用导致植被覆盖增加
2 >0 <0 100 0 气候变化导致植被覆盖增加
3 <0 >0 0 100 人类活动导致植被覆盖增加
植被减少区 1 <0 <0 CNDVICNDVI+HNDVI×100 HNDVICNDVI+HNDVI×100 气候变化和人类活动共同作用导致植被覆盖减少
2 <0 >0 100 0 气候变化导致植被覆盖减少
3 >0 <0 0 100 人类活动导致植被覆盖减少
Tab.2  Relative role anglusis method of climatic changes and human activities in process of vegetation variables for different situations
Fig.3  Spatial distribution of land cover change trend from 2001 to 2015 of Hainan Island
地区 整体变化影响 气候变化影响 人类活动影响
植被增加区域 植被减少区域 植被增加区域 植被减少区域 植被增加区域 植被减少区域
海口市 4.92 1.73 4.43 2.22 4.70 1.94
文昌市 5.19 1.67 4.90 1.91 4.94 1.87
琼海市 4.25 1.00 2.94 2.31 4.26 0.98
万宁市 4.43 1.30 3.15 2.58 4.40 1.34
陵水黎族自治县 2.38 0.91 1.98 1.29 2.31 0.97
三亚市 3.05 2.40 3.09 2.35 2.76 2.68
乐东黎族自治县 5.28 2.67 5.49 2.47 4.55 3.40
东方市 3.99 1.99 3.56 2.43 3.92 2.07
昌江黎族自治县 3.25 1.15 2.50 1.90 3.22 1.18
白沙黎族自治县 5.71 0.85 4.55 2.03 5.69 0.89
儋州市 8.04 0.89 7.53 1.38 7.65 1.26
临高县 3.42 0.32 3.08 0.66 3.36 0.38
澄迈县 5.42 0.82 4.85 1.40 5.28 0.97
定安县 3.22 0.48 1.85 1.86 3.27 0.44
琼中黎族苗族自治县 6.58 1.78 5.15 3.24 6.89 1.50
屯昌县 2.97 0.82 2.74 1.05 2.89 0.91
五指山市 2.98 0.51 2.09 1.42 2.98 0.53
保亭黎族苗族自治县 2.76 0.86 2.37 1.25 2.71 0.91
Tab.3  Percentage of land cover change from 2001 to 2015 in different cities of Hainan Island(%)
Fig.4  Spatial distribution of the effects of climate changes and human activities from 2001 to 2015 of Hainan Island
Fig.5  Spatial distribution of relative roles of climate changes and human activities for increasing vegetation areas in Hainan Island form 2001 to 2015
Fig.6  Spatial distribution of relative roles of climate changes and human activities for decreasing vegetation areas in Hainan Island form 2001 to 2015
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