南京林业大学学报(自然科学版) ›› 2023, Vol. 47 ›› Issue (4): 226-234.doi: 10.12302/j.issn.1000-2006.202108041
收稿日期:
2021-08-23
修回日期:
2021-11-28
出版日期:
2023-07-30
发布日期:
2023-07-20
通讯作者:
* 孟京辉(作者简介:
于颖(基金资助:
YU Ying1(), MENG Jinghui1,*(
), SONG Zengming2, XU Lu3
Received:
2021-08-23
Revised:
2021-11-28
Online:
2023-07-30
Published:
2023-07-20
摘要:
【目的】探索构建生态网络以恢复破碎景观、提升景观连通性的新思路,为县域景观格局优化和生态红线保护提供科学依据。【方法】以江西信丰县为对象,基于景观格局构建生态风险指数,评估其生态风险水平,结合最小累积阻力模型(MCR)和景观连通性分析,确定生态源地、区分一般廊道和重要廊道,构建以信丰县为案例的县域潜在生态网络。【结果】信丰县城市建设用地和耕地集中区域的生态风险相对较高,而森林覆盖区域的生态风险相对较低;潜在生态网络由30个生态源地、67条生态廊道、25个生态节点构建而成;重要生态廊道在东西方向和南北方向生态斑块的沟通与连接中起到关键作用,一般生态廊道将多个相邻、分散的生态源地连接到一起。【结论】景观连通性分析不仅可用于确定斑块重要性,还可用于确定廊道重要性。生态风险评估与生态网络构建相结合,可加强县域生态网络的完整性和可靠性。
中图分类号:
于颖,孟京辉,宋增明,等. 基于MCR模型和景观连通性的县域生态网络构建[J]. 南京林业大学学报(自然科学版), 2023, 47(4): 226-234.
YU Ying, MENG Jinghui, SONG Zengming, XU Lu. Construction of ecological network in Xinfeng based on MCR model and landscape connectivity[J].Journal of Nanjing Forestry University (Natural Science Edition), 2023, 47(4): 226-234.DOI: 10.12302/j.issn.1000-2006.202108041.
表1
研究区阻力因子的阻力系数和权重"
阻力因子 resistance factor | 分级范围/m classification index | 阻力值(RV) resistance value | 权重 weight |
---|---|---|---|
海拔 elevation | <300 | 5 | |
[300,400) | 30 | ||
[400,600) | 60 | 0.2 | |
[600,800) | 80 | ||
≥800 | 100 | ||
坡度 slope | <5° | 1 | |
[5°,15°) | 10 | ||
[15°,25°) | 50 | 0.2 | |
[25°,35°) | 80 | ||
≥35° | 100 | ||
生态风险指数 ERI | [0.053 5,0.074 5) | 10 | |
[0.074 5,0.087 2) | 30 | ||
[0.087 2,0.098 9) | 50 | 0.6 | |
[0.098 9,0.110 9) | 80 | ||
[0.110 9,0.143 6) | 100 |
表2
研究区生态风险区面积统计"
风险等级区 risk level area | 生态风险指数范围 range of ERI | 面积/hm2 area | 比例/% proportion |
---|---|---|---|
低生态风险区 low ecological risk area | [0.053 5,0.074 5) | 43 937.08 | 15.33 |
较低生态风险区 lower ecological risk area | [0.074 5,0.087 2) | 69 396.60 | 24.21 |
中等生态风险区 medium ecological risk area | [0.087 2,0.098 9) | 58 969.25 | 20.57 |
较高生态风险区 higher ecological risk area | [0.098 9,0.110 9) | 78 855.47 | 27.51 |
高生态风险区 high ecological risk area | [0.110 9,0.143 6) | 35 496.37 | 12.38 |
总计total | — | 286 654.78 | 100.00 |
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[1] | 马颖忆, 刘志峰. 江苏省景观生态风险评估及其与城镇化的动态响应[J]. 南京林业大学学报(自然科学版), 2021, 45(5): 185-194. |
[2] | 唐晓岚,包文渊,贾艳艳,刘德保. 太湖风景区古村古镇景观生态风险分析[J]. 南京林业大学学报(自然科学版), 2018, 42(02): 105-112. |
[3] | 程鹏;桑和会;唐丽影;罗宁;张新法;余本付;黄存忠. 安徽省森林生态网络体系[J]. 南京林业大学学报(自然科学版), 2002, 26(05): 44-48. |
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