Biomass accumulation and carbon sequestration potential in varying tree species, ages and densities in Gunung Bromo Education Forest, Central Java, Indonesia

Abstract

Abstract. Darmawan AA, Ariyanto DP, Basuki TM, Syamsiyah J, Dewi WS. 2022. Biomass accumulation and carbon sequestration potential in varying tree species, ages and densities in Gunung Bromo Education Forest, Central Java, Indonesia. Biodiversitas 23: 5093-5100. Forest biomass plays an important role in carbon storage to mitigate climate change. While many studies have investigated the carbon stock of various forests, adding knowledge in the context of education forest might enrich the importance of this forest as a carbon pool besides its role for education purposes. Gunung Bromo Education Forest in Karanganyar Regency, Central Java, Indonesia consists of several tree cover types with each type having a different ability to absorb carbon dioxide in the atmosphere. This research aimed to determine the accumulation of biomass in Gunung Bromo Education Forest and to investigate the potential for carbon sequestration across different tree species, age classes and densities. Three species of tree (i.e. pine, Indonesian rosewood and mahogany) with varying ages were measured and calculated the biomass (i.e. tree, litter and understorey) and total carbon sequestration potentials (i.e. tree, litter and understorey, and soil organic carbon). This study used purposive sampling method across 9 combinations of tree cover type and age classes, each with 3 replication, resulting in a total of 27 sampling points. The results showed pine stands planted in 1973 had the highest tree biomass of 461.08 t ha-1 and while the pine agroforest planted in 2016 and Indonesian rosewood agroforest planted in 2018 had the lowest tree biomass with 1.02 t ha-1 and 0.39 t ha-1, respectively. Similarly, the pine stands planted in 1973 had the highest total carbon sequestration of 372.68 t ha-1 and the lowest in the pine agroforest planted in 2016 and Indonesian rosewood agroforest planted in 2018 with 187.11 t ha-1 and 193.58 t ha-1 respectively. The results of this study strengthen the common agreement in previous carbon studies that tree age strongly affects biomass accumulation and carbon sequestration, in which the older the plant, the higher the carbon sequestration potential than that of younger plants.

The Assessment of Soil Quality and Earthworms as Bioindicators in the Alas Bromo Education Forest, Central Java, Indonesia

“…The soil indicator used to calculate the SQI is the Minimum Data Set (MDS) obtained from Principal Component Analysis (PCA) and Pearson correlation analysis. The soil quality index is obtained by multiplying the weight index (Wi) and score index (Si) based on Nusantara et al [35], which is shown in Equation (1). Weight index (Wi) is the result of dividing the proportion with the cumulative on the PCA analysis.…”

“…Located in Karanganyar Regency, Central Java Province, Indonesia, the Alas Bromo educational forest is strategically important to Universitas Sebelas Maret (UNS) for education, research, and the advancement of science and technology [1]. Like other tropical forests, the Alas Bromo Forest provides numerous environmental benefits and indirectly contributes to biodiversity conservation and climate regulation [2].…”

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“…Berdasarkan tabel tersebut dapat dilihat bahwa permudaan pohon memiliki nilai serapan karbon dan biomassa yang lebih tinggi dibandingkan dengan permudaan pancang. Hal ini dikarenakan 84,9% kelas usia pohon berkontribusi terhadap biomassa karbon dimana biomassa akan semakin meningkat secara signifikan seiring dengan bertambahnya usia pohon yang ditandai dengan peningkatan ukuran diameter batang (Darmawan et al, 2022). Keterkaitan antara aspek kelas usia pohon dengan peningkatan produksi biomassa dapat dilihat pada tabel dimana Taman Monumen 45 memiliki produksi biomassa yang lebih tinggi dibandingkan dengan Taman Jaya Wijaya hal ini dikarenakan rata-rata diameter pohon yang ada di Taman Monumen 45 lebih besar daripada diameter pohon yang ada di Taman Jaya Wijaya dengan selisih ratarata sebesar 2.8 cm.…”

Carbon sequestration potential of Tamanu (Calophyllum inophyllum) in Gunung Kidul, Yogyakarta

“…The aforementioned numerical values indicate the soil's ability to store carbon, which is a critical determinant in reducing atmospheric carbon dioxide concentrations. The historical influence of land management practices such as fertilization at the research location, which incidentally is former agroforestry land, is thought to support high soil carbon uptake [27,28] The soil carbon sequestration method involves utilizing soils as substantial repositories for the retention of organic carbon, hence assuming a pivotal function in the amelioration of carbon emissions. The results emphasize the importance of conserving and improving soil organic carbon levels, as it plays a critical role in raising soil fertility and increasing the capacity for carbon sequestration.…”