Research on Ecological Security Pattern Construction Based on the Evaluation of Ecosystem Services and Eco-Environmental Sensitivity
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摘要: 生态安全是国家安全的重要组成部分,构建生态安全格局对保障区域生态安全和实现可持续发展具有重要意义. 生态系统服务与生态环境敏感性评价能够揭示区域生态系统质量和生态产品供给能力,为生态安全格局构建提供科学基础. 本文以宁夏回族自治区为研究对象,基于生态系统服务与生态环境敏感性评价识别重要生态源地,并采用最小累积阻力(minimal cumulative resistance, MCR)模型识别重要生态廊道与关键生态节点,进而构建了宁夏的生态安全格局. 结果表明:①宁夏生态系统服务极重要性区域面积为14 280.05 km2,主要分布于西北部贺兰山、东部哈巴河、中部罗山及南部六盘山地区. 生态系统极敏感区域面积为7 340.58 km2,主要分布于宁夏南部水土流失治理区和沙坡头区沙漠化防治区. ②将评价结果与自然保护地空间分布相结合,综合确定全区生态源地面积为16 300 km2,主要包括西北、东部、南部山地以及黄河沿线区域. 生态安全缓冲区按照高、中、低水平分别占研究区总面积的67.93%、22.92%和9.15%. ③识别生态廊道为64条,生态节点12个,均呈现中部密集、南北稀疏的空间分布特征,与生态源地分布及其破碎程度相符. ④以研究区现有生态安全格局为基础,提出“一廊三屏四区多节点”生态安全格局优化策略. 研究显示,基于生态系统服务与生态环境敏感性评价的生态源地选择方法是在现有研究范式下对生态格局构建研究的补充,同时研究结果将为宁夏生态安全格局优化以及国土空间修复提供重要参考.
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关键词:
- 生态安全格局 /
- 生态系统服务 /
- 生态环境敏感性 /
- 最小累积阻力(MCR)模型 /
- 宁夏回族自治区
Abstract: Ecological security is an important part of national security. Ecological security pattern construction is of great significance for ensuring regional ecological security and achieving sustainable development. This study selected Ningxia Hui Autonomous Region as the study area and identified important ecological sources based on the ecosystem services and eco-environment sensitivity evaluation result. The minimum cumulative resistance (MCR) model was used to identify ecological corridors and key ecological nodes, and develop an ecological security pattern in the study area. The results show that: (1) The area of important ecosystem services is 14,280.05 km2, primarily distributed in the Helan Mountains in the northwest, Habahe in the east, Luoshan in the middle, and Liupanshan in the south. The sensitive area of the ecosystem is 7,340.58 km2, primarily distributed in the soil erosion control and desertification control areas in the southern Ningxia and Shapotou districts, respectively. (2) When the evaluation results were combined with the spatial distribution of nature reserves, the ecological source area of the whole region was determined to be 16,300 km2, including mountainous in the northwest, east and south of Ningxia, and the belt area along the Yellow River. The ecological security buffer zone accounted for 67.93%, 22.92% and 9.15% of the total area of Ningxia according to high, medium, and low levels, respectively. (3) There are 64 ecological corridors and 12 ecological nodes, all of which are dense in the middle and sparse in the north and south, which is consistent with the distribution of ecological sources and their degree of fragmentation. (4) Based on the ecological security pattern in the study area, the optimization strategy of ‘one corridor, three protective screens, four districts and multiple nodes’ ecological security pattern is proposed. The research shows that the ecological source selection method based on ecosystem services and eco-environment sensitivity evaluation is a supplement to the research on ecological pattern construction under the existing research paradigm, and the research results will provide important reference for the optimization of the ecological security pattern and land space restoration in the Ningxia Hui Autonomous Region. -
表 1 生态系统服务与生态环境敏感性评价方法
Table 1. Evaluation of ecosystem services and ecosystem sensitivity
评价类型 计算公式 具体参数及其描述 防风固沙重要性 $\begin{array}{c}{S}_{\mathrm{L} }={\dfrac{2\times Z}{ {H}^{2} }}Q_{\mathrm{m}\mathrm{a}\mathrm{x} }\times {\mathrm{e} }^{ {-\left(\tfrac{ {\textit{Z} } }{H}\right)}^{2} } \\ H=150.71\times {(\mathrm{W}\mathrm{F}\times \mathrm{E}\mathrm{F}\times \mathrm{S}\mathrm{C}\mathrm{F}\times {K}'\times C)}^{-0.371\;1} \\ {Q}_{\mathrm{m}\mathrm{a}\mathrm{x} }=109.8\times (\mathrm{W}\mathrm{F}\times \mathrm{E}\mathrm{F}\times \mathrm{S}\mathrm{C}\mathrm{F}\times {K}'\times C)\end{array}$ SL为土壤风力侵蚀量,t/(km2·a);Qmax为风力最大转移量,kg/m;H为关键地块长度,m;Z为最大风蚀出现距离,m;WF为气候因子;K'为地表糙度因子;EF为土壤可侵蚀因子;SCF为土壤结皮因子;C为植被覆盖因子 水源涵养重要性 $ \mathrm{T}\mathrm{Q}=P-\mathrm{R}\mathrm{R}-\mathrm{E}\mathrm{T} $ TQ为水源涵养量,mm/a;P为年降雨量,mm/a;RR为地表径流量,mm/a;ET为蒸散发量,mm/a 土壤保持重要性 Ac=Ap−Ar=PR×K×L×S×(1−C) Ac为土壤保持量,t;Ap为潜在土壤侵蚀量,t;Ar为实际土壤侵蚀量,t;PR为降水侵蚀力因子;K为土壤可蚀性因子;L、S分别为坡长、坡度因子 生物多样性保护重要性 Sbio=NPPmean×Fpre×Ftem×(1−Falt) Sbio为生物多样性维护服务能力指数;NPPmean为研究区多年平均年净初级生产力;Fpre为降水参数;Ftem为气温参数;Falt为海拔参数 水土流失敏感性 $ {\mathrm{S}\mathrm{S}}_{i}=\sqrt[4]{{\mathrm{P}\mathrm{R}}_{i}\times {K}_{i}\times {\mathrm{L}\mathrm{S}}_{i}\times {C}_{i}} $ SSi为i空间单元水土流失敏感性指数,PRi为i空间单元降雨侵蚀力因子,Ki为i空间单元土壤可蚀性因子,LSi为i空间单元坡长坡度因子,Ci为i空间单元植被覆盖因子 土地沙化敏感性 $ {D}_{i}=\sqrt[4]{{I}_{i}\times {W}_{i}\times {N}_{i}\times {M}_{i}} $ Di为i空间单元土地沙化敏感性指数,Ii、Wi、Ni、Mi分别为i空间单元评估区域干燥度指数、起沙风天数、土壤质地和植被盖度的敏感性等级值 表 2 宁夏生态源地扩张阻力因子权重、分级及阻力值
Table 2. Weighting, classification and value of resistance factors for ecological source expansion in Ningxia
一级指标(权重) 二级指标(权重) 指标分级/分类 阻力值 土地利用类型
(0.5)土地利用类型
(0.5)林地
灌木地
草地
湿地
水体
耕地
裸地
人造地表10
20
40
20
10
60
80
100人类活动
(0.3)与道路(国道、
省道)的距离
(0.15)<500 m
500~1 000 m
1 000~1 500 m
1 500~2 000 m
>2 000 m100
80
60
40
20与居民点的距离
(0.15)<500 m
500~1 000 m
1 000~2 000 m
2 000~3 000 m
>3 000 m100
80
60
40
20植被覆盖
(0.2)NDVI
(0.2)<0.3
0.3~0.5
0.5~0.6
0.6~0.8
>0.8100
80
60
40
20表 3 宁夏生态系统服务重要性评价结果
Table 3. Results of the ecosystem services evaluation in Ningxia
生态系统服务
重要性评价防风固沙 水土保持 水源涵养 生物多样性维护 面积/km2 占比/% 面积/km2 占比/% 面积/km2 占比% 面积/km2 占比/% 一般重要 29 047.12 55.92 45 218.68 87.05 38 739.06 74.57 44 576.77 85.81 重要 12 625.95 24.31 3 759.21 7.24 11 276.63 21.71 5 394.93 10.39 极重要 10 273.54 19.78 2 968.72 5.71 1 930.92 3.72 1 974.91 3.80 表 4 宁夏生态环境敏感性评价结果
Table 4. Results of the eco-environmental sensitivity evaluation in Ningxia
生态环境
敏感性评价水土流失 土地沙化 面积/km2 占比/% 面积/km2 占比/% 一般敏感 27 593.01 53.11 20 680.09 39.81 敏感 18 086.05 34.82 30 104.42 57.97 极敏感 6 267.55 12.07 1 152.09 2.22 -
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