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Measurement of Above-ground Carbon Stocks of Roadside Agroforestry Plantation at Sadar Upazila of Mymensingh District in Bangladesh

Mukta Biswas
Department of Agroforestry, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Mohammad Kamrul Hasan
Department of Agroforestry, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

In this research, floristic composition and above-ground carbon stocks of all woody species in roadside plantations under Sadar Upazila of Mymensingh District were studied. A total of 280 sample plots of 2 m×10 m size was selected following systematic random sampling in a zigzag manner on both sides along the roadside plantation were measured. The result showed that a total of 29 species of 14 families were recorded where the most common species are Acacia auriculiformis, Swietenia sp, and Artocarpus heterophyllus. It was found that Albizia saman, Albizia lebbeck and Swietenia sp comprises 71% of total aboveground carbon of which Albizia saman occupies the highest (50%) amount among the tree species in the study area. Similarly, Swietenia sp in the case of tree seedlings, Cocos nucifera in case of palm species and Acacia auriculiformis deadwood species occupy the highest amount of above-ground carbon (68, 48 and 73%) respectively in the study area. The study revealed that the total carbon stock measured in the roadside plantation were 2554.27 Mg/ha where tree occupies the highest (2078.44 Mg/ha) amount of carbon stock and the lowest (2.85 Mg/ha) in seedlings/saplings in the study area. The results indicate that two attributes such as tree basal area and stand density/ha are strongly related to above-ground carbon stocks, but stand mean height is weakly related. Therefore, the study recommends that the above-ground carbon stocks would increase with the increase of planting trees having greater DBH, basal area and stand density in the roadside areas.

Keywords: Above-ground, Carbon pool, Afforestation, Floristic composition, Greenhouse effect

Location: Sadar Upazila of Mymensingh District, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Contamination of soil

Objectives:

To estimate the above-ground carbon stocks of roadside plantation at Sadar Upazila of Mymensingh district in Bangladesh.

Methodology:

Study area: The study was carried out at Sadar Upazila of Mymensingh District which is located in 24^o38' to 24^o54' north latitudes and 90^o11' to 90^o30' east longitudes. The area of Sadar Upazila is 388.45 km² (Wikipedia, 2019). In the study site, a moderate climate present with average temperature and rainfall of 25.3^oC and 2249 mm along with clayey texture soil which contains a large quantity of iron and aluminum and highly aggregated. Road network of the study area: In Mymensingh District, there is 285.83 km National Highway, 569.62 km Regional Highway and 1777.21 km District road (RHD, 2019). While Mymensingh Sadar Upazila has 1138 km roads consists of 166 km metalled, 4 km semi-metalled and 968 km unmetalled roads (BBS, 2013). In this study, metalled and semi-metalled roads as a total of 170 km were considered as study sites for sampling. The vegetation of the study area: The roads and highways in Sadar Upazila have been planted with various types of vegetation on both sides under social forestry program of the Mymensingh Forest Division. Several tree species such as Akashmoni (Acacia auriculiformis), Raintree (Albizia saman), Mahogoni (Swietenia sp), Kalokoroi (Albizia lebbeck), Sadakoroi (Albizia procera), Sissoo (Dalbergia sissoo), Pithraj (Aphanamixis polystachya) and Goraneem (Melia azedarach), etc. palms, shrubs have been planted along the roadside in the study area. Sampling design: Considering 170 km of roads as sampling area a total number of 510 plots of size 2m×10m were selected following systematic sampling in a zigzag manner on both sides of the road which apart from 500 m of each plot. Nearly half of the total plots were unconsidered for sampling due to the absence of vegetation. The rest 280 plots were selected randomly and then above-ground biomass such as a live tree, non-tree vegetation (tree seedlings/saplings, shrubs, palms) and deadwood selected as carbon pools for estimating carbon stocks.

Source of Information: J Bangladesh Agril Univ 18(2): 252–259, 2020

Article Link (Online Journal): https://doi.org/10.5455/JBAU.91198

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The study revealed that the vegetation structure, species richness, density and recruitment of trees in the roadside of Mymensingh are richer even the other natural forests of Bangladesh. The carbon stock of roadside plantation is quite satisfactory and substantial. The results indicate that two attributes such as basal area and stand density of trees are strongly related to above-ground carbon stocks, but the average height of tree is weakly related. Therefore, the study recommends that the amount of above-ground carbon stocks would increase with the increase of planting trees having greater DBH, basal area and stand density in the roadside areas. Moreover, it can be suggested that by increasing more plantations in the roadside and its surrounding areas that could be on a trajectory towards carbon sequestration in addressing the long-lasting environmental issues in Bangladesh respectively.

Knowledge Management: Journal