Research on ecological restoration zoning in coastal zone based on landscape ecological risk and ecosystem service value：a case study of Fangchenggang City
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摘要:
以防城港市海岸带地区为例，计算其在不同时期内的景观生态风险和生态系统服务价值，利用空间自相关分析二者的空间关联性，基于分析结果划定海岸带地区的国土空间生态修复分区。结果表明：2000—2020年防城港市海岸带地区的土地利用类型以林地为主，约占研究区面积的50%，其次为海域（18%）、耕地（16%）和建设用地（6%），在研究期间海岸带地区林地、海域和建设用地的类型转换最为剧烈。研究区整体生态风险等级以较低生态风险为主，约占研究区面积的32%，其次为中生态风险（26%）、低生态风险（18%）和较高生态风险（16%），而高生态风险的面积较少，约占研究区面积的8%，研究期间较低生态风险和中生态风险的范围呈现缩减趋势，而低生态风险、较高生态风险和高生态风险的范围呈现扩张趋势。研究区的生态系统服务价值呈现先增后减的趋势，20年间累计减少5.43亿元。基于景观生态风险和生态系统服务价值的空间集聚分析结果，将研究区划分为生态优先修复区、生态重点修复区、生态综合提升区、生态预防治理区和生态保育涵养区，针对不同分区分别提出了滨海湿地修复、农地肥力培育、城市内河治理、提升生态用地完整度和促进林草自然更新等生态修复措施。
Abstract:The coastal zone of Fangchenggang City was taken as an example, its landscape ecological risk and ecosystem service value in different periods were calculated, the spatial correlation of the two was analyzed using spatial autocorrelation, and the ecological restoration zoning of the national land space in the coastal zone were delineated based on the analysis results. The results showed that from 2000 to 2020, the land use type of the coastal zone of Fangchenggang City was dominated by forest land, accounting for about 50% of the study area, followed by sea area (18%), cultivated land (16%) and construction land (6%), and the type conversion of forest land, sea area and construction land in the coastal zone was the most drastic during the study period. The overall ecological risk level of the study area was dominated by lower ecological risk, which accounted for about 32% of the study area, followed by medium ecological risk (26%), low ecological risk (18%) and higher ecological risk (16%), while the area of high ecological risk was smaller, accounting for only about 8% of the study area. The ranges of lower ecological risk and medium ecological risk showed a trend of shrinking during the study period, while the ranges of low, higher and high ecological risk showed an expansion trend. The value of ecosystem services in the study area showed a trend of "increasing first and then decreasing", with a cumulative decrease of 543 million yuan over the 20 years. Based on the results of spatial clustering analysis of landscape ecological risk and ecosystem service value, the study area was divided into ecological priority restoration area, ecological key restoration area, ecological comprehensive enhancement area, ecological preventive management area and ecological conservation and nourishment area. Ecological restoration measures such as restoration of coastal wetlands, cultivation of agricultural land fertility, management of urban inland waterways, enhancement of the completeness of ecological land use, and promotion of natural regeneration of forests and grasses, etc., were put forward for the different sub-areas, respectively.
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图 2 2000—2020年研究区土地利用类型分布
Figure 2. Distribution of land use types in the study area from 2000 to 2020
图 3 研究区2000—2020 年景观生态风险空间分布
Figure 3. Spatial distribution of landscape ecological risks in the study area from 2000 to 2020
图 4 研究区2000—2020 年生态系统服务价值空间分布
Figure 4. Spatial distribution of ecosystem service values in the study area from 2000 to 2020
图 5 研究区2000—2020 年景观生态风险与生态系统服务价值空间相关性
Figure 5. Spatial correlation between landscape ecological risk and ecosystem service value in the study area from 2000 to 2020
图 6 研究区2000—2020年景观生态风险与生态系统服务价值空间自相关聚类
Figure 6. Spatial autocorrelation clustering of landscape ecological risk and ecosystem service value in the study area from 2000 to 2020
图 7 研究区国土空间生态修复分区
Figure 7. Ecological restoration zoning of national land space in the study area
表 1 研究区各景观类型单位面积生态系统服务价值
Table 1. Ecosystem service value per unit area for each landscape type in the study area
元/hm2 第一类服务 第二类服务 耕地 林地 草地 湿地 水域 海域 供给服务 食物生产 1 421.45 324.81 385.91 656.05 1 029.11 1 029.11 原料生产 315.16 746.10 572.44 643.19 295.87 295.87 水资源供给 −1 678.73 385.91 315.16 3 331.73 10 664.10 10 664.10 调节服务 气体调节 1 144.88 2 453.77 2 000.32 2 444.13 990.51 990.51 气候调节 598.17 7 342.02 5 293.46 4 630.97 2 945.81 2 945.81 净化环境 173.66 2 151.47 1 749.48 4 630.97 7 139.42 7 139.42 水文调节 1 923.14 4 804.64 3 878.44 31 169.03 131 519.67 131 519.67 支持服务 土壤保持 668.92 2 987.62 2 437.69 2 971.54 1 196.34 1 196.34 维持养分循环 199.39 228.33 186.53 231.55 90.05 90.05 生物多样性 218.68 2 720.70 2 219.01 10 123.82 3 280.27 3 280.27 文化服务 美学景观 96.48 1 193.12 977.65 6 084.59 2 431.26 2 431.26 合计 5 081.21 25 338.51 20 016.10 66 917.58 161 582.42 161 582.42 
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表 2 研究区2000—2020年各等级景观生态风险面积和比例
Table 2. Area and proportion of each class of landscape ecological risk in the study area from 2000 to 2020
生态风险等级 2000 年 2010 年 2020 年 面积/km2 占比/% 面积/km2 占比/% 面积/km2 占比/% 低生态风险区 221.29 18.20 203.34 16.72 251.11 20.65 较低生态风险区 421.96 34.70 349.89 28.77 369.70 30.40 中生态风险区 321.50 26.44 343.07 28.21 306.65 25.22 较高生态风险区 171.70 14.12 211.37 17.38 203.32 16.72 高生态风险区 79.63 6.55 108.41 8.91 85.30 7.01
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表 3 研究区2000—2020 年各土地利用类型生态系统服务价值变化
Table 3. Changes in ecosystem service values by land use types in the study area from 2000 to 2020
地类 ESV/亿元 ESV变化率/% 2000 年 2010 年 2020 年 2000—
2010 年2010—
2020 年2000—
2020 年耕地 0.99 0.99 0.99 −0.45 0.44 −0.01 林地 16.28 16.11 15.37 −1.05 −4.57 −5.57 草地 0.03 0.01 0.01 −80.85 21.78 −76.67 湿地 1.36 0.79 1.08 −41.81 36.57 −20.54 水域 10.48 17.62 12.74 68.15 −27.69 21.58 海域 39.49 35.82 33.01 −9.31 −7.84 −16.41 合计 68.64 71.33 63.21 3.93 −11.39 −7.91
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表 4 研究区2000—2020 年各项生态系统服务价值变化
Table 4. Changes in the values of various ecosystem services in the study area from 2000 to 2020
第一类服务 第二类服务 ESV/亿元 ESV 变化率/% 2000 年 2010 年 2020 年 2000—2010 年 2010—2020 年 2000—2020 年 供给服务 食物生产 0.82 0.83 0.78 1.54 −6.53 −5.10 原料生产 0.65 0.62 0.61 −4.15 −1.77 −5.85 水资源供给 3.29 3.24 2.98 −1.42 −8.03 −9.33 调节服务 气体调节 2.16 0.58 2.03 −73.14 250.59 −5.85 气候调节 5.85 1.15 5.48 −80.39 377.99 −6.25 净化环境 3.72 2.45 3.44 −34.16 40.25 −7.66 水文调节 44.78 44.34 41.03 −0.99 −7.45 −8.36 支持服务 土壤保持 2.49 0.56 2.33 −77.38 314.81 −6.18 维持养分循环 0.22 0.07 0.21 −67.33 189.65 −5.36 生物多样性 3.02 1.25 2.79 −58.58 123.17 −7.56 文化服务 美学景观 16.63 8.95 15.30 −46.16 70.90 −7.99
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