福建省生态系统健康程度耦合评估及其时空演化分析

Coupled assessment and spatio-temporal evolution analysis of ecosystem health in Fujian Province

为了探究近15 a福建省生态优良的成因,以5 a为时间间隔选取2005—2020年福建省MODIS影像和土地利用数据等为数据源,构建土地利用强度体系,采用遥感生态指数(remote sensing ecological index,RSEI)作为分析方法,并利用耦合协调模型分析RSEI与土地利用强度的耦合关系,最后对福建省2005—2020年的生态健康进行时空演化分析。结果表明:①2005—2020年间,福建省全省生态环境发展呈“改善—退化—退化”的趋势,RSEI均值2020年为0.7048,生态环境等级均为良好;②福建省全省土地利用强度呈增长趋势,增长率为26.00%,其中三明市土地利用强度增长最多,增长160.91%;③福建省全省耦合协调度上升0.7290,达到良好协调;省内各市除厦门市耦合协调度下降0.1310,耦合协调度为轻度失调外,耦合协调度趋势均为上升。本研究填补了生态系统健康程度与土地利用强度互动研究机制的空白,也为福建省乃至全国的生态文明建设和生态系统健康程度评估研究提供了新的视角。

This study aims to explore the origin of the excellent ecology in Fujian Province in the past 15 years.First,a land use intensity system with a five-year time interval was constructed using the 2005—2020 MODIS images and land use data of Fujian as data sources.Then,the coupling relationship between the remote sensing ecological index(RSEI)and land use intensity was analyzed based on a coupled coordination model.Finally,the spatio-temporal evolution analysis was conducted for the ecological health of Fujian from 2005 to 2020.The results show that:①The ecological environment of Fujian manifested an improvement-degradation-degradation trend,with an average RSEI value of 0.7048 in 2020,suggesting a sound ecological environment;②The land use intensity of Fujian displayed an increasing trend,with a growth rate of 26.00%.Most especially,Sanming City demonstrated a maximum increase of 160.91%in land use intensity;③The coupled coordination degree of Fujian increased by 0.7290,suggesting high coordination.All cities in Fujian exhibited increased coupled coordination degrees,except for Xiamen City,where the coupled coordination degree decreased by 0.1310,implying a slight imbalance.This study fills the gap in the research on the interactions between ecosystem health and land use intensity.It also provides a new perspective for ecological civilization construction and ecosystem health assessment in Fujian and even China.