摘要
红树林湿地已成为海岸带生态安全格局重要组成部分,从景观格局尺度开展洛阳江河口湿地生态风险评价,可为红树林湿地生态风险控制、沿海红树林地区景观格局优化、沿海地区可持续发展及生态文明建设提供可视化分析和决策依据。利用2016、2020和2024年洛阳江湿地土地利用数据,基于ArcGIS 10.8和Fragstats 4.2平台揭示景观格局变化特征与生态风险的时空分布规律。结果表明:(1)2016—2024年,洛阳江湿地红树林面积逐渐增加,互花米草面积先增加后减少,光滩和水域保持稳定。(2)2016—2024年期间土地利用类别变化活跃,其中红树林和互花米草是洛阳江湿地变换最频繁的类别。(3)洛阳江湿地景观风险在2016年以低风险和中风险为主,在2020年以中风险和高风险为主,到2024年景观生态风险有明显改善。
Mangrove wetlands are an important part of coastal ecosystems and are crucial for maintain-ing ecological stability.Luoyang River wetland is a representative subtropical estuarine wetland,rich in marine biological resources,as well as rare and endangered species.In this study,Luoyang River wetland was selected for research,and we explored the spatiotemporal distribution of land use in the wetland and assessed the ecological risk status of the mangrove ecosystem.The study was based on Landsat 8 satellite imagery data for Luoyang River wetland in 2016,2020 and 2024,and four land use types were identified using the Google Earth Engine(GEE):mangrove,salt marsh(area of Spartina alterniflora),bare tidal flats,and water.Based on the distribution of landscape types,landscape metrics were calculated using Fragstats 4.2,and the results were integrated to derive the landscape ecological risk index.The aim of the study was to provide visual analysis and a basis for decision-making on mangrove wetland risk control,mangrove landscape optimization,coastal sustainable development and ecological civilization construc-tion.Results show:(1)From 2016 to 2024,the mangrove area of the Luoyang River wetland continuously increased,with an increase of 0.99 km2(2.34 km2 to 3.33 km2),the salt marsh area initially increased and then decreased,and the areas of tidal flats and water was unchanged.(2)The ecological risk index(ERI),from west to east,alternated from high to low and back to high.High/medium risk areas were concentrat-ed in the western and peripheral zones,and low risk areas were dominated by well-preserved mangrove forests in the eastern region,with less Spartina alterniflora invasion and encircled by high-risk zones.In general,the ecological risk in the study area fluctuated but remained mostly stable,with most regions classified as ecologically stable.(3)The landscape ecological risk in the Luoyang River wetland was primarily characterized by low and moderate risk in 2016,shifted to moderate and high risk in 2020,and showed significant improvement by 2024.The variation in landscape ecological risk within the Luoyang River wetland ecosystem was attributed to a combination of natural and anthropogenic factors.In 2020,the expansion of Spartina alterniflora elevated landscape ecological risk in the mangrove ecosystem.However,recent data indicates a decline in landscape ecological risk in the Luoyang River wetland,reflect-ing measurable improvements in the mangrove ecosystem health.
作者
林伟
李诗华
韦旭
苏颖
曾吉雨
LIN Wei;LI Shihua;WEI Xu;SU Ying;ZENG Jiyu(College of Advanced Manufacturing,Fuzhou University,Quanzhou 362251,P.R.China;Key Laboratory of Ocean Space Resource Management Technology,MNR,Hangzhou 310012,P.R.China)
出处
《水生态学杂志》
北大核心
2025年第5期50-62,共13页
Journal of Hydroecology
基金
国家自然科学基金青年项目(42401110)
自然资源部海洋空间资源管理技术重点实验室开放基金课题(KF-2024-108)。
关键词
景观格局
生态风险评估
土地利用变化
洛阳江河口湿地
红树林
landscape pattern
ecological risk assessment
land use change
Luoyang River estuarine wetland
mangrove
作者简介
林伟,1999年生,男,硕士研究生,研究方向为景观生态学。E-mail:ecolinwei@outlook.com;通信作者:李诗华,1992年生,男,讲师,研究方向为湿地生态学。E-mail:ecoshihua@163.com。
