Hutan menutupi seperempat bagian dari wilayah daratan di dunia dan memainkan peran yang penting di dalam memelihara lingkungan global seperti pencegahan banjir, pengendalian proses pemadang-pasiran dan penyerapan serta fiksasi CO2. Hutan telah semakin berkurang yang disebabkan oleh kegiatan tebas dan bakar, penebangan pohon secara berlebihan untuk mendapatkan kayu bakar serta kayu komersil, dan oleh konversi dari tanah-tanah hutan menjadi tanah-tanah pertanian. Bumi kita sekarang terbuka terhadap bahaya dari pemanasan global. Dipercayai bahwa sejumlah besar CO2 dan beberapa Gas Rumah Kaca lain dilepaskan oleh kegiatan-kegiatan ekonomi dan membentuk suatu lapisan sekeliling bumi, yang menahan energi matahari dan mengakibatkan peningkatan dari suhu rata-rata. Perubahan iklim yang disebabkan oleh pemanasan itu telah mendatangkan lebih banyak bencana-bencana alam daripada sebelumnya di berbagai belahan dunia. Memahami situasi demikian, BP2TP-DAS-IBB melakukan studi untuk mengumpulkan dan menganalisis berbagai data guna mengkuantifikasikan kandungan karbon dalam biomassa dengan membuat persamaan allometrik tegakan jati (Tectona grandis LINN) sebagai salah satu jenis unggulan dalam pembangunan hutan tanaman industri. Dalam penelitian ini, lokasi yang dipilih adalah hutan tanaman jati pada Kesatuan Pemangkuan Hutan (KPH) Perum Perhutani Cepu, Unit II Jawa Tengah. Penelitian yang dilakukan merupakan pengamatan terhadap kondisi yang ada dan tidak melakukan perlakuan. Metode yang digunakan untuk mengetahui rosot karbon dalam tanaman adalah dengan pendekatan IPCC Guidelines. Dalam penelitian ini diasumsikan bahwa jumlah karbon yang dapat diserap dan disimpan oleh tanaman sama
dengan jumlah karbon yang terdapat dalam biomassa tanaman tersebut. Hasil penelitian ini menunjukkan bahwa persamaan korelasi antara umur tegakan/tanaman dengan diameter, berat kering total biomassa dengan diameter, dan kandungan karbon dengan diameter, memberikan nilai koefisien determinasi yang tinggi. Ini berarti, persamaan-persamaan tersebut dapat digunakan untuk mengestimasi kandungan karbon tegakan/tanman jati.

Forests cover a quarter part of world land area and plays an important role in maintaining global environment, such as controlling flood, desertification process, and sequestration and fixation of CO2. The existing of forest was decreasing due to slash and burn activities, over forest felling for fuel wood and commercial timber, conversion of forest land to other uses. Our world is now opening to adversity of global warming. It is believed that most of CO2 and other green house gases were released from economics activities formed a layer surrounding world atmosphere, stopped solar energy, and caused a raise average temperature. Climate change caused by global warming has overcome to more intent natural disaster in some parts of the world as before. Concerning this situation, BP2TPDAS-IBB have conducted a study to collect and analyze some data to quantify the fixation of carbon content, stands biomass by making allomatric equation in teak (Tectona grandis LINN) as one favorite species in developing industrial plantation forest. The study was located at teak plantation forest at Cepu Forestry District (KPH), Perum Perhutani Unit II, Central Java. The research deals with the observation of the current condition and does not employ a treatment. The research methodology used to quantify carbon sequestration in the plant biomass was IPCC approximation guidelines. In this research assumed that, the amount of absorbed and stored of carbon contents in plant was the same as the carbon content in the plant biomass. The results of the study show that the correlation equations between stand/plant age and diameter, total dry weight biomass and diameter, also carbon content and diameter give high value of determination coefficient. It means that those equations could be used to estimate the carbon content of teak stand/plant.

Increasing CO2 concentration in the atmosphere is one of the factors which causes global climate change in the world. Development and conservation of forest vegetation such as mangrove forest is one of the ways for decreasing CO₂ concentration in atmosphere. Avicennia marina (Forsk.) Vierh. belongs to mangrove forest species that has high ability for carbon sequestration. In this research, carbon estimation in A. marina stand and analysis of soil organic carbon were conducted. The research was conducted at BKPH Ciasem, KPH Purwakarta, Perum Perhutani Unit III West Java and Banten. Average of soil organic carbon was 2.9% from five soil sampling points. The content of soil organic carbon was categorized as moderate. From the destructive sampling activity in the field, the following allometric models were obtained: above ground biomass Y = 0.1848(DBH) ^2.3524  R²= 0.9839, below ground biomass Y = 0.1682(DBH)^1.7939 R² = 0.8581, and total biomass Y = 0.2905(DBH)^2.2598 R² = 0.9815. A. marina stand at BKPH Ciasem had potency of total biomass content and total carbon content of 364.9 and 182.5 ton/ha, respectively. The uptake of total CO₂ and average CO₂ at BKPH Ciasem were 669.0 ton/ha and 14.2 ton/tree, respectively.

This research aimed to obtain information about the values of biomass and carbon content in the primary forest of the one and the five year logged over areas (LOA) in Siberut Biosphere Reserve, West Sumatra. It was conducted on December 2007. Three sample units of 50 x50 m² each were established in each vegetation plot. The results showed that the biomass of forest stands of more than five cm of diameter in primary forest with tree density of 114.25 tree/ha was 131.92 ton/ha, while the one year LOA with tree density of 69.25 trees/ha was 70.39 ton/ ha, and the five year LOA with tree density of 113.83 trees/ha was 97.55 ton/ha. The carbon content and sequestration of carbondioxide each site were 65.96 ton C/ha and 242.07 ton CO2/ha, 35.19 ton C/ha and 129.15 ton CO2/ha, 48.77 ton C/ha and 178.99 ton CO2/ha. Consecutively in the primary forest, the tree species with the highest biomass potency, carbon content and sequestration carbondioxide was koka (Dipterocarpus elongates Korth.) i.e. 132.28 ton/ha, 66.14 ton C/ha and 242.73 ton CO2/ha. The potency of necromass in primary forest, one year LOA and five year LOA were 0.65 ton/ ha, 0.78/ha and 0.73 ton/ha respectively.

Natural forest has many ecological functions which plays a vital role in preserving the ecosystem balance. One of them is to stabilize the climatic condition. This is linked with the forest capability to absorb carbondioxide in the photosynthesis process. The more carbondioxide absorbed and stored in the form of biomass carbon, the more it reduces greenhouse gas effect in the atmosphere. This paper discusses the carbon biomass potency of old growth forest and thirty year-old logged over forest in the Malinau Research Forest, located in East Kalimantan. Twenty centimeters depth of soil sampling was collected from five points representing each study site. Above ground biomass estimation was done by establishing four 1-ha plots for both forest sites. Within the 1-ha plot, 25 subplots with the size of 20 m x 20 m were also established. Trees with dbh ≥ 10 cm were recorded in terms of diameter and height. Tree biomass was estimated by employing Brown and Chave allometric equation. The study results showed that the soil carbon of 20 cm depth at old growth forest and the thirty year logged over forest were 37.86 tonC/ha and 30.58 tonC/ha, respectively. Further, the above ground carbon biomass of the old growth forest and the thirty year logged over forest were 264.70 tonC/ha and 249.10 tonC/ha, respectively. In conclusion, accumulation of carbondioxide in the old growth forest and the thirty year logged over forest for the past 30 years were 970.57 tonCO2/ha and 913.37 tonCO2/ha, respectively. It is of interest to note that the potency of natural forest in Malinau Research Forest in absorbing carbon is very high when it is managed sustainably. Tthe above ground biomass difference between the old growth forest and the 30 year logged over forest was only slightly.

This research is aimed at describing changes on accumulation of carbon biomass from year 2002 to 2005 observed on secondary forest under a closed site (bamboo fence, without local use) and an open site (no fence, with local use), so called baseline scenario. The observation was established in secondary forest in Maribaya. Results from this study indicate that carbon tree biomass increases from 2.87 ton C/ha (year 2002) to 17.28 ton C/ha (year 2005) in a closed site, meanwhile in the open site it increases from 1.81 ton C/ha (year 2002) to 11.96 ton C/ha (year 2005). Undergrowth biomass observed in year 2005 were 2.43 ton C/ha and 2.83 ton C/ha on the closed and open site respectively. Overall difference of accumulated carbon biomass between the two sites was 3.86 ton C/ha, which was considered as a leakage in the carbon project of 4 year old Acacia mangium Willd. plantation. Average accumulation of carbon biomass throughout the two study sites was 17.25 ton C/ha (equivalent to 63.31 ton CO2/ha) and considered as a baseline scenario. In contrast, the average accumulation of carbon biomass conserved from 4 year old A. mangium plantation was 31.41 ton C/ha (equivalent to 115.29 ton CO2/ha). This study shows that carbon gained from mangium plantation as compared to the baseline was 14.16 ton C/ha (equivalent to 51.97 ton CO2/ha). Some important allometric equations describing relationship between growth parameter and biomass in baseline sites were also established.