成都市龙泉山城市森林公园植被覆盖度与景观格局特征动态变化分析

Dynamic Change Analysis of Vegetation Coverage and Landscape Pattern Characteristics in Longquan Mountain Urban Forest Park,Chengdu City

生态环境恶化问题引起人们高度重视,对植被覆盖度与景观格局特征动态变化研究,可有效增强植被群落稳定性。成都市龙泉山城市森林公园为川中丘陵区生态恢复典型自然地理代表。本研究基于Landsat8 OLI与GF1 WFV遥感影像数据,结合像元二分模型和景观格局指数,分析了该公园2014~2021年植被覆盖度变化特征与空间景观格局变化特征。结果表明:①龙泉山城市森林公园2014、2017和2021年植被覆盖度皆以中高覆盖度为主,且2021年验证精度达0.90。②2014~2021植被覆盖情况呈现先下降再上升的趋势:2014~2017年间,植被覆盖度退化严重,中高与高植被幅度盖度面积骤减,景观上斑块复杂度与破碎度加剧;2017~2021年间,由于政府保护措施的执行,植被覆盖度有所恢复,中低植被覆盖度面积减少幅度最大,高植被覆盖度面积增加幅度最大,植被生态有所恢复,景观上斑块复杂度降低、景观破碎加剧程度有所缓解。本研究为川中丘陵区的生态恢复及今后规划提供一定的科学参考依据。

People attach great importance to the deterioration of ecological environment.The study on the dy⁃namic changes of vegetation coverage and landscape pattern characteristics can effectively enhance the stability of vegetation community.Longquan Mountain Urban Forest Park in Chengdu is a typical physical and geograph⁃ical representative of ecological restoration in the hilly area of central Sichuan.Based on Landsat8OLI and GF1WFV remote sensing image data,combined with pixel dichotomy model and landscape pattern index,this study analyzed the change characteristics of vegetation coverage and spatial landscape pattern in the park from 2014 to 2021.The results show that:①the vegetation coverage of Longquan Mountain Urban Forest Park is mainly medium and high coverage in 2014,2017 and 2021,and the verification accuracy is 0.90 in 2021.②from 2014 to 2021,the vegetation cover decreased first and then increased:from 2014 to 2017,the vegeta⁃tion coverage degraded seriously,the coverage area of medium-high and high vegetation amplitude decreased sharply,and the patch complexity and fragmentation on the landscape increased.From 2017 to 2021,due to the implementation of government protection measures,the vegetation coverage was restored,the area of middle and low vegetation coverage decreased the most,the area of high vegetation coverage increased the most,the vegetation ecology was restored,the complexity of patches on the landscape decreased and the degree of land⁃scape fragmentation was alleviated.This study provides a certain scientific reference basis for ecological restora⁃tion and future planning in the hilly area of central Sichuan.