The process of leaf litter decomposition on the soil surface as a source of nutrition and food for soil fauna. Leaf litter decomposition rate is influenced by the activity of soil fauna, which is thought to increase the emission of carbondioxide from the soil. The aim of this research was to investigate the leaf decomposition rate and flux of carbon dioxide in various land cover. The research was conducted from July to November 2020 in Gunung Bromo Education Forest, Karanganyar, Central Java. This research used purposive sampling with nine land covers and three replications. The leaf decomposition rate was measured using the litterbag method, and flux of carbon dioxide was measured using the closed chamber method. The results suggested that the leaf decomposition rate was the fastest in Pine 2016 at 6.17 g/week, and the highest flux of carbon dioxide in Indonesian rosewood (Dalbergia sissoo) rejuvenation was 9,860 mg/CO2/day. The leaf decomposition rate was influenced by air temperature (p = 0.535) compared to humidity (p = - 0.257). Flux carbondioxide is influenced by air temperature (p = 0.854) compared to humidity (p = - 0.677), and the leaf decomposition rate affects the level of flux of carbon dioxide (p = 0.631).
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.
Penelitian ini bertujuan mengetahui pengaruh pemberian cangkang telur dan air leri pada larutan nutrisi (AB-mix) terhadap pertumbuhan dan hasil tanaman bayam, mengetahui pertumbuhan bayam merah dan bayam hijau serta mengetahui interaksi pemberian cangkang telur dan air leri pada larutan AB Mix terhadap pertumbuhan dan hasil jenis bayam merah dan bayam hijau. Metode penelitan yang digunakan adalah Rancangan Acak Kelompok Lengkap (RAKL) dengan dua faktor dan 3 ulangan. Faktor pertama adalah perlakuan A0 (AB Mix 1%), A1 (AB Mix 1% dan cangkang telur 1%), A2 (AB Mix 1% dan Air Leri 1%), A3 (AB Mix 1%, cangkang telur 0,5% dan air leri 0,5%) dan faktor kedua adalah varietas bayam merah dan bayam hijau. Parameter yang diukur adalah tinggi tanaman, jumlah daun, luas daun, panjang akar, bobot tajuk segar, bobot tajuk kering, bobot akar segar, bobot akar kering. Hasil penelitian ini menunjukan bahwa perlakuan A2 (AB Mix 1% dan Air Leri 1%) dapat meningkatkan tinggi tanaman, jumlah daun, luas daun, panjang akar, bobot tajuk segar, bobot akar segar, bobot tajuk kering dan bobot akar kering pada jenis bayam merah dan bayam hijau. Pertumbuhan tanaman jenis bayam hijau lebih baik dibandingkan dengan jenis bayam merah. Interaksi pemberian cangkang telur dan air leri pada larutan AB Mix dengan jenis bayam berpengaruh pada jumlah daun, tinggi tanaman dan bobot akar kering.
Penelitian ini bertujuan untuk (1) mengetahui pengaruh pemberian arang sekam terhadap pertumbuhan dan hasil sawi hijau, (2) mengetahui pengaruh pemberian pupuk kotoran ayam terhadap pertumbuhan dan hasil sawi hijau, (3) mengetahui interaksi perlakuan pemberian arang sekam dan dosis pupuk kotoran ayam terhadap pertumbuhan dan hasil sawi hijau. Penelitian ini dilaksanakan pada September 2019 sampai dengan Januari 2020 di Screen House Fakultas Pertanian Universitas Jenderal Soedirman. Rancangan percobaan yang digunakan yaitu Rancangan Acak Kelompok Lengkap (RAKL) dengan 2 faktor. Faktor pertama adalah media arang sekam, yaitu A0 = Tanpa arang sekam; A1 = Arang sekam 12,5 ton/ha atau setara dengan 50 g/polibag; A2 = Arang sekam 25 ton/ha atau setara dengan 100 g/polibag; A3 = Arang sekam 37,5 ton/ha atau setara dengan 150 g/polibag. Faktor kedua adalah dosis pupuk kotoran ayam yaitu, P0 = tanpa pupuk kotoran ayam; P1 = pupuk kotoran ayam 5 ton/ha atau setara dengan 20 g/polyibag; P2 = pupuk kotoran ayam 10 ton/ha atau setara dengan 40 g/polibag; P3 = pupuk kotoran ayam 15 ton/ha atau setara dengan 60 g/polibag, masing - masing faktor dikombinasikan dan didapatkan 16 kombinasi perlakuan. Perlakuan diulang sebanyak 3 kali ulangan sehingga diperoleh 48-unit percobaan. Variabel yang diamati adalah tinggi tanaman (cm), jumlah daun (helai), luas daun (cm), panjang akar (cm), bobot tanaman segar (g), bobot tajuk segar (g), bobot tajuk kering (g), bobot akar segar (g), bobot akar kering (g). Data yang diperoleh dianalisis dengan analisis varian. Apabila perlakuan berbeda nyata diuji lanjut dengan menggunakan DMRT pada taraf 5%. Hasil penelitian menunjukkan pemberian arang sekam dengan dosis 35,70 ton/ha mampu meningkatkan pertumbuhan dan hasil sawi hijau pada parameter tinggi tanaman, luas daun, bobot tanaman segar, bobot tajuk segar, bobot tajuk kering, bobot akar segar. Pemberian pupuk kotoran ayam dengan dosis 15 ton/ha mampu meningkatkan pertumbuhan dan hasil sawi hijau pada parameter tinggi tanaman, jumlah daun, luas daun, bobot tanaman segar, bobot tajuk segar, bobot tajuk kering, bobot akar segar, bobot akar kering. Interaksi perlakuan pemberian arang sekam dan dosis pupuk kotoran ayam terhadap pertumbuhan dan hasil sawi hijau tidak ada.
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