Study on ecosystem service value of Guangxi in the past 20 years based on land use change
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摘要:
为探究广西土地利用变化对生态系统服务价值(ecosystem service value,ESV)的影响,采用随机森林算法对2000—2020年5期Landsat系列遥感影像进行土地利用分类,运用土地利用动态度、土地利用转移矩阵方法揭示土地利用变化规律,运用当量因子法计算ESV,探究其时空变化特征,并分析各土地利用类型与ESV变化之间的内在联系。结果表明:林地和耕地是广西主体土地利用类型;建设用地面积逐年增加,主要是侵占耕地;单一土地利用类型动态度表现为未利用地>草地>建设用地>耕地>水域>林地。广西生态系统服务价值总体呈波动下降趋势;单向生态系统服务价值以水文调节和气候调节为主;在空间分布上,ESV呈中部低、四周高的特征;广西近20年的ESV变化,草地、林地和耕地是主要贡献因子和敏感因子。
Abstract:In order to investigate the effects of land use change on ecosystem service value (ESV) in Guangxi Autonomous Region, the random forest algorithm was used to classify the land use of the 5 periods of Landsat series remote sensing images from 2000 to 2020, the land use dynamic degree and land use transfer matrix methods were used to reveal the land use change patterns, the ecosystem services value was calculated by using the equivalence factor method, with its spatiotemporal variation characteristics explored, and the intrinsic link between each land use type and changes in ecosystem service values was analyzed. The results showed that forest land and arable land were the main land use types in Guangxi, and the area of construction land had been increasing year by year, mainly by encroaching on arable land. The dynamic degree of single land use type was in the order of unutilized land > grassland > construction land > cropland > water > forest land. The overall ESV in Guangxi showed a fluctuating downward trend. The value of unidirectional ecosystem services was dominated by hydrological regulation and climate regulation. In terms of spatial distribution, the ESV was characterized by a low spatial distribution in the middle and high spatial distribution in the surrounding area. For the changes of ESV in Guangxi in the last 20 years, grassland, forest land and cropland were the main contributing factors and sensitive factors.
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Key words:
- land use change /
- ecosystem service value /
- spatiotemporal variation /
- Guangxi
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表 1 训练样本点和测试样本点数量
Table 1. Number of training sample points and test sample points
土地利用类型 训练样本点数 测试样本点数 耕地(1) 125 54 林地(2) 155 66 草地(3) 35 15 水域(4) 55 24 建设用地(5) 110 48 未利用地(6) 30 13 表 2 广西生态系统服务价值系数
Table 2. Ecosystem service value coefficient of Guangxi
元/(hm2·a) 一级服务功能 二级服务功能 耕地 林地 草地 水域 未利用地 供给服务 食物生产 4 048.123 879.230 696.057 1 465.384 18.317 原料生产 897.548 1 996.586 1 025.769 421.298 54.952 水资源供给 4 854.085 1 025.769 567.836 15 185.042 36.635 调节服务 气体调节 3 260.479 6 557.593 3 608.508 1 410.432 201.490 气候调节 1 703.509 19 654.463 9 543.313 4 194.662 183.173 净化环境 494.567 5 879.853 3 150.576 10 166.102 567.836 水文调节 5 476.873 14 818.696 6 997.209 187 276.075 384.663 土壤保持 1 904.999 8 004.660 4 396.152 1 703.509 238.125 支持服务 维持养分循环 567.836 604.471 329.711 128.221 18.317 生物多样性 622.788 7 290.285 3 993.171 4 670.912 219.808 文化服务 美学景观 274.760 3 205.528 1 758.461 3 461.970 91.587 表 3 2000—2020年广西土地利用类型占比及其变化
Table 3. Change pattern of land use type proportion in Guangxi from 2000 to 2020
% 年份 耕地 林地 草地 水域 建设用地 未利用地 2000 21.869 65.687 8.848 1.635 1.895 0.066 2005 21.814 65.761 8.768 1.644 1.944 0.069 2010 21.749 65.806 8.710 1.673 1.997 0.066 2015 21.553 65.522 8.831 1.686 2.342 0.066 2020 27.191 64.379 4.371 1.574 2.482 0.004 2000—2005 −0.055 0.075 −0.080 0.009 0.048 0.003 2005—2010 −0.065 0.044 −0.058 0.028 0.054 −0.003 2010—2015 −0.196 −0.283 0.121 0.013 0.345 0.001 2015—2020 5.639 −1.144 −4.460 −0.112 0.140 −0.063 2000—2020 5.323 −1.308 −4.478 −0.061 0.587 −0.062 表 4 2000—2020年广西土地利用动态度
Table 4. Dynamic degree of land use in Guangxi from 2000 to 2020
% 年份 耕地 林地 草地 水域 建设用地 未利用地 总计 2000—2005 −0.050 0.023 −0.181 0.110 0.511 0.966 1.841 2005—2010 −0.060 0.014 −0.133 0.346 0.554 −0.969 2.074 2010—2015 −0.180 −0.086 0.277 0.157 3.452 0.208 4.360 2015—2020 5.279 −0.313 −10.083 −1.291 1.232 −18.920 37.119 2000—2020 0.986 −0.092 −5.104 −0.185 1.189 −86.899 94.456 表 5 2000—2020广西各土地利用类型生态系统服务价值及其变化
Table 5. Structure and change of ESV of various land use types in Guangxi from 2000 to 2020
年份 项目 耕地 林地 草地 水域 未利用地 合计 2000 价值量/亿元 1 249.436 10 885.038 756.382 891.712 0.314 13 782.871 占比/% 9.065 78.975 5.488 6.470 0.002 100 2005 价值量/亿元 1 246.274 10 897.398 749.542 896.601 0.330 13 790.145 占比/% 9.037 79.023 5.435 6.502 0.002 100 2010 价值量/亿元 1 242.557 10 904.766 744.559 912.107 0.314 13 804.303 占比/% 9.001 78.995 5.394 6.607 0.002 100 2015 价值量/亿元 1 231.371 10 857.791 754.882 919.249 0.317 13 763.611 占比/% 8.947 78.888 5.485 6.679 0.002 100 2020 价值量/亿元 1 556.403 10 688.063 374.294 859.921 0.017 13 478.699 占比/% 11.547 79.296 2.777 6.380 0.000 100.000 ESV变化量/亿元 306.978 −196.975 −382.088 −31.790 −0.297 −304.173 ESV变化率/% 24.570 −1.810 −50.515 −3.565 −94.559 −2.207 表 6 2000—2020年广西单向生态系统服务价值
Table 6. Unidirectional land ecosystem service value in Guangxi from 2000 to 2020
一级服务功能 二级服务功能 ESV/亿元 ESV
变化量/亿元ESV
变化率/%2000年 2005年 2010年 2015年 2020年 供给服务 食物生产 366.982 366.508 365.979 363.754 408.478 41.496 11.307 原料生产 380.513 380.563 380.521 379.070 375.385 −5.128 −1.348 水资源供给 482.056 481.818 482.122 479.815 532.862 50.806 10.540 调节服务 气体调节 1 271.087 1 271.168 1 270.951 1 266.109 1 255.682 −15.406 −1.212 气候调节 3 364.622 3 366.155 3 366.926 3 355.793 3 229.237 −135.386 −4.024 净化环境 1 046.599 1 047.197 1 047.986 1 045.024 1 001.467 −45.132 −4.312 水文调节 3 463.530 3 468.090 3 480.458 3 475.778 3 391.468 −72.062 −2.081 土壤保持 1 443.777 1 444.147 1 444.203 1 439.252 1 398.643 −45.135 −3.126 支持服务 维持养分循环 130.953 130.926 130.865 130.294 132.968 2.015 1.539 生物多样性 1 269.147 1 269.698 1 270.132 1 266.233 1 213.559 −55.589 −4.380 文化服务 美学景观 563.603 563.874 564.159 562.489 538.950 −24.653 −4.374 -
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