Metro City is one of the cities in Lampung Province, Indonesia, which has experienced various infrastructure development which contributed to the decrease of the air quality. Urbanization also causes constant decrease in term of the number of green open spaces.Yet green open space plays an important role in maintaining urban air quality. Vegetation (i.e., tree) as the main component of green open space has the ability to absorb and store carbon emission. In Metro city, there is a major green open space that includes numerous large-sized Mahogany trees lining along A.H. Nasution Road. The purpose of this study was to estimate the level of air pollution from emissions of the passing-by motorized vehicles, calculate the capacity of carbon sequestration by the Mahogany trees, and determine the potential of the Mahogany trees in improving air quality. Authors collected primary data on the diameter of the tree trunks and the number of passing-by vehicles to estimate the carbon-storing capacity and carbon emission by utilizing allometric equation and emission load analysis. This study concluded that the Mahogany trees could play an important role on storing 74% of expected annual CO2 emission in Metro City. This could be linked to the achievement of the SDGs especially Target 11.6.
Sebuah kawasan perkotaan harus memiliki ketersediaan Ruang Terbuka Hijau (RTH) sebesar 30% dari luasannya. Keberadaan RTH dapat menciptakan kenyamanan termal bagi warga kotanya. Kota Metro di Provinsi Lampung mengalami urbanisasi yang mengakibatkan jumlah RTH-nya mengalami penurunan akibat dari alih guna lahan. Jl. A.H. Nasution adalah bentang jalan yang memiliki jalur hijau dengan vegetasi utama Pohon Mahoni di sepanjang ruas jalannya. Kawasan Pohon Mahoni ini selain bernilai sejarah juga berperan penting sebagai bagian dari RTH di Kota Metro. Penelitian ini bertujuan untuk mengetahui pengaruh adanya Pohon Mahoni di sepanjang Jl. A.H. Nasution, Kota Metro terhadap kenyamanan termal berdasarkan persepsi masyarakat. Kemudian penelitian ini juga ditujukan untuk mengetahui persepsi masyarakat terkait pentingnya pelestarian Pohon Mahoni sebagai warisan lanskap sejarah Kota Metro. Metode penelitian yang dilakukan adalah pengumpulan data melalui survey dan observasi langsung dengan pengukuran dan pengambilan foto dokumentasi. Selanjutnya pengumpulan data dilanjutkan dengan menggunakan kuesioner. Kuesioner disusun dengan mengacu pada prinsip kenyamanan termal yang dilihat dari temperatur, kelembaban, dan kecepatan angin. Data yang dikumpulkan kemudian dianalisis dengan metode kualitatif. Hasil penelitian menunjukkan bahwa Pohon Mahoni di sepanjang Jl. A.H. Nasution sangat berpengaruh terhadap kenyamanan termal berdasarkan persepsi masyarakat. Masyarakat Kota Metro diketahui menganggap bahwa pelestarian kawasan Pohon Mahoni adalah penting.
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