关键词：土地利用/土地覆盖，城市绿地，德里岭，城市森林，遥感，时空分析
摘 要：城市绿地在缓解城市化加剧带来的多重环境挑战方面发挥着重要作用。然而，城市森林本身容易因不可持续的人类活动而退化。尽管承受着巨大的人为压力，德里岭的森林仍为德里市民提供了无数基本的生态系统服务。本研究旨在确定德里岭四个不同地区的总体土地利用/土地覆盖动态，并考虑到该地区城市化的猖獗。研究估算了30年期间(1989-2020年)的变化，中间间隔为5年，并分析了这一时期的陆地卫星数据。德里岭的所有四个部分都表现出绿色覆盖的整体增加，在中密林类中，中央岭观察到的面积百分比变化最大(494.31%)。相反，边界处以及山脊森林内的建筑面积也有所增加，显示出严重的人为干扰，在南山脊观察到的建筑百分比变化最大（339.28%）。本研究提供了德里岭森林观测到的时空变化的基线信息，并强调了城市化的影响。这些发现对制定合理的城市政策以确保德里岭森林脆弱栖息地的长期保护具有重大意义。
Abstract:Urban green spaces play a substantial role in alleviation of multiple environmental challenges caused by intensified urbanization. However, urban forests themselves are prone to degradation from unsustainable human activities. The forests of Delhi Ridge provide myriad of essential ecosystem services to the citizens of Delhi, though it is under immense anthropogenic pressure. This study is carried out for identifying the overall land use/land cover dynamics in the four different parts of Delhi Ridge in light of rampant urbanization in the area. Variations were estimated for the period of three decades (1989-2020) with the intervening gap of 5 years and Landsat data has been analyzed for this period. All the four parts of Delhi Ridge exhibit overall increase in the green cover with maximum percentage change in area in moderately dense forest class has been observed in Central Ridge (494.31%). On the contrary, there is also an increase in built-up area at the boundaries and also within the Ridge forest depicting severe human interference with maximum percentage change in built-up observed in Southern Ridge (339.28%). The present study provides baseline information on the spatio-temporal changes observed in the Delhi Ridge forest and also highlights the impact of urbanization. Such findings hold substantial implications in framing rational urban policies for ensuring long-term conservation of the fragile habitat of Delhi Ridge forest.
Key: Land use/Land cover, Urban Green Spaces, Delhi Ridge, Urban Forest, Remote Sensing, Spatio-temporal Analysis
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