Study on spatial and temporal evolution of ecological risk and ecological zoning identification in Guangdong-Hong Kong-Macao Greater Bay Area under the background of urbanization
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摘要:
为揭示粤港澳大湾区城市群30年间土地利用类型转移变化规律,基于1990—2020年共4期Landsat遥感影像,分析研究区生态系统服务价值(ESV)及生态风险值时空演变特征并构建生态功能分区。结果表明:30年间,粤港澳大湾区建设用地面积累计增加5 616 km2,增幅达179%,主要源于林地和耕地的转移变化;ESV在时间上总体呈先增加后减少趋势,在空间上呈中部低、四周高特征;生态风险在时间上呈不断增加趋势,风险等级向中高风险类型转移,在空间上呈中部高、四周低分布特征且表现出一定的空间集聚现象;根据ESV与生态风险值分布,可将研究区划分为严格管控区、重点管控区、一般管控区与生态保护区4种功能生态分区,其中严格管控区面积呈扩大趋势,重点管控区面积呈先增后减趋势,而生态保护区面积呈持续缩小趋势。
Abstract:In order to reveal the transfer and change rule of land use types in the urban agglomeration of Guangdong-Hong Kong-Macao Greater Bay Area (GBA) in the past 30 years, based on four Landsat remote sensing images from 1990 to 2020, the spatial and temporal evolution characteristics of ecosystem service value (ESV) and ecological risk value in the study area were analyzed and the ecological function zoning was constructed. The results showed that in the past 30 years, the cumulative increase in construction land area in GBA was 5 616 km2, with an increase of 179%, mainly due to the transfer of forest land and cultivated land. ESV generally increased first and then decreased in time, and was spatially low in the middle and high in the surrounding area. Ecological risks were increasing in time, and the risk level was shifting to medium and high-risk types. The ecological risk was spatially characterized by high distribution in the middle and low in the surrounding area and showed a certain spatial agglomeration phenomenon. According to the distribution of ESV and ecological risk value, the research area could be divided into four functional ecological zones: strict control zone, key control zone, general control zone and ecological protection zone. The strict control zone was expanding, the key control zone was increasing first and then decreasing, and the ecological protection zone was shrinking continuously.
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表 1 粤港澳大湾区单位面积生态系统服务价值系数
Table 1. Ecosystem service value coefficients per unit area in the GBA
元/hm2 服务类型 功能类型 生态系统服务价值 耕地 林地 草地 水域 建设用地 未利用地 供给服务 食物生产 1 910.52 873.14 657.01 1 383.18 0.00 17.29 原料生产 423.60 2 005.62 968.23 397.67 0.00 51.87 水资源供给 −2 256.32 1 037.38 535.98 14 333.24 0.00 34.58 调节服务 气体调节 1 538.79 6 596.06 3 406.09 1 331.31 34.58 190.19 气候调节 803.97 19 347.29 9 007.98 3 959.36 0.00 172.90 净化环境 233.41 5 783.44 2 973.85 9 595.84 172.9 535.98 水文调节 2 584.82 12 915.48 6 604.71 176 770.92 51.87 363.08 支持服务 土壤保持 899.07 8 031.12 4 149.56 1 607.95 34.58 224.77 维持养分循环 268.00 613.78 311.21 121.03 0.00 17.29 生物多样性 293.93 7 313.59 3 769.17 4 408.90 34.58 207.47 文化服务 美学景观 129.67 3 207.26 1 659.82 3 267.77 17.29 86.44 合计 6 829.46 67 724.16 34 043.61 217 177.17 345.80 1 901.86 表 2 1990—2020年粤港澳大湾区单一土地利用类型变化
Table 2. Changes of single land use type in the GBA from 1990 to 2020
土地利用类型 1990—2000年 2000—2010年 2010—2020年 1990—2020年 数量变化/km2 动态度/% 数量变化/km2 动态度/% 数量变化/km2 动态度/% 数量变化/km2 动态度/% 耕地 −1 476.8 0.93 −1 801.3 −1.25 −2 227.3 −1.76 −5 505.4 −1.15 林地 −281.6 −0.09 −581.7 −0.19 −3 024.1 −1.01 −3 887.5 −0.42 草地 −49.8 −0.39 −123.0 −1.01 1 826.4 16.58 1 653.7 4.33 水域 517.7 1.34 −279.3 −0.64 −146.5 −0.36 91.9 0.08 建设用地 1 323.7 4.21 2 912.6 6.53 1 379.7 1.87 5 616.0 5.96 未利用地 −0.3 −0.12 −12.2 −5.17 −4.5 −3.94 −16.9 −2.37 表 3 1990—2020年粤港澳大湾区生态系统服务价值的变化
Table 3. Ecosystem service value changes in the GBA from 1990 to 2020
亿元 土地利用
类型生态系统服务价值 生态系统服务价值变化量 1990年 2000年 2010年 2020年 1990—2000年 2000—2010年 2010—2020年 1990—2020年 耕地 108.69 98.60 86.30 71.09 −10.09 −12.30 −15.21 −37.60 林地 2 093.58 2 074.51 2 035.11 1 830.31 −19.07 −39.40 −204.81 −263.27 草地 43.37 41.67 37.49 99.66 −1.69 −4.19 62.18 56.30 水域 836.96 949.38 888.73 856.92 112.42 −60.65 −31.81 19.96 建设用地 1.09 1.54 2.55 3.03 0.46 1.01 0.48 1.94 未利用地 0.02 0.04 0.02 0.01 0.00 −0.02 −0.01 −0.03 合计 3 083.72 3 165.75 3 050.20 2 861.02 82.03 −115.55 −189.19 −222.71 表 4 粤港澳大湾区生态风险等级面积及占比
Table 4. Areas and proportions of ecological risk grade in the GBA
生态风险等级 1990年 2000年 2010年 2020年 面积
/103 km2占比/% 面积
/103 km2占比/% 面积
/103 km2占比/% 面积
/103 km2占比/% 低风险区 26.73 48.43 26.35 47.73 25.17 45.59 25.63 46.44 较低风险区 12.25 22.19 11.19 20.28 10.35 18.75 9.51 17.22 中风险区 10.00 18.11 8.43 15.27 6.30 11.42 5.97 10.82 较高风险区 3.88 7.03 5.07 9.19 5.71 10.35 4.21 7.63 高风险区 2.34 4.24 4.16 7.53 7.67 13.89 9.88 17.89 表 5 1990—2020年粤港澳大湾区生态风险值的 I统计量
Table 5. I statistics of ecological risk value of the GBA in 1990 to 2020
年份 I P* Z 1990 0.682111 0 60.007596 2000 0.712809 0 62.702843 2010 0.769646 0 67.690184 2020 0.789517 0 69.429529 -
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