Pendugaan Cadangan Karbon pada Berbagai Kelas Penutupan Lahan di Areal Pembangunan Bendungan Cijurey, Kabupaten Bogor

Abstract

Perubahan penutupan lahan hutan menjadi area terbangun berdampak pada penurunan kapasitas ekosistem dalam menyimpan karbon. Penelitian ini bertujuan menduga biomassa dan cadangan karbon pada 6 kelas penutupan lahan, yakni belukar tua, hutan tanaman, pertanian lahan kering, pertanian lahan kering campur, semak belukar dan sawah. Pengambilan contoh menggunakan metode stratified systematic plot sampling with random start dengan 27 plot pada 6 kelas penutupan lahan. Data yang diambil pada setiap plot contoh berupa sampel tumbuhan bawah untuk memperoleh biomassa dari nilai berat kering. Selain itu, data diameter dan tinggi vegetasi dihitung menggunakan model alometrik dan konversi karbon. Hasil penelitian menunjukkan bahwa pertanian lahan kering campur memiliki cadangan karbon tertinggi sebesar 90,91 ton/ha, diikuti hutan tanaman (63,58 ton/ha), belukar tua (23,30 ton/ha), pertanian lahan kering (7,00 ton/ha), semak belukar (3,83 ton/ha) dan sawah (1,22 ton/ha). Total cadangan karbon pada luasan 58,18 ha mencapai 2582,59 ton, dengan selang kepercayaan 95% antara 1648,06 hingga 3517,13 ton dengan tingkat kesalahan penarikan contoh sebesar 36,19%.

Land cover change from forest to built-up areas reduces the ecosystem’s capacity to store carbon. This study aimed to estimate biomass and carbon stock across six land cover classes: old shrubland, forest plantation, dryland agriculture, mixed dryland agriculture, shrubland, and rice field. Sampling was conducted using the stratified systematic plot sampling with random start method, with 27 plots distributed among the six land cover classes. Data collected from each sample plot included understory samples to determine biomass from dry weight values. In addition, vegetation diameter and height data were used to calculate biomass using allometric models and carbon conversion factors. The results showed that mixed dryland agriculture had the highest carbon stock at 90.91 ton/ha, followed by forest plantation (63.58 ton/ha), old shrubland (23.30 ton/ha), dryland agriculture (7.00 ton/ha), shrubland (3.83 ton/ha), and rice field (1.22 ton/ha). The total carbon stock within the 58.18 ha study area reached 2,582.59 tons, with a 95% confidence interval ranging from 1,648.06 to 3,517.13 tons and a sampling error of 36.19%.