Biomass and carbon storage in an age-sequence of Acacia mangium plantation forests in Southeastern region, Vietnam

Abstract

Aim of the study: The major objective of this study was to estimate the biomass increment and carbon (C) storage of the main ecosystem components in an age-sequence of three Acacia mangium plantation stands.Area of study: Chang Riec Historical - Cultural Forest, Southeastern region, Vietnam.Material and methods: In order to assess the biomass of different tree components, 36 trees with diameter at breast height ranging from 13.38 to 22.87 cm were harvested from the different aged stands. Biomasses of understory (shrubs and herbs), and litter were also determined. Carbon storage in the trees and understory biomass, litter, and mineral soil (0-50 cm) were determined by analyzing the C content of each compartment.Main results: The biomass in trees, understory vegetation, litter, and ecosystem increased with stand age. Soil C represented 61.99% of the total, aboveground tree biomass C made up 26.73%, belowground tree biomass C accounted for 7.01%, and litter comprised 2.96%, whereas only a small amount (1.30%) was associated with understory vegetation. The average C content of total tree (47.97%) was higher than those of understory and litter. Soil organic C stock in the top 50 cm depth in 4-, 7- and 11-year-old stands of A. mangium were 86.86, 126.88 and 140.94 Mg. C ha-1 respectively. Soil C concentration decreased continually with increasing soil depth. Total C storage of three planted forests ranged from 131.36 to 255.86 Mg. C ha-1, of which 56.09 - 67.61% of C storage was in the soil and 26.88 - 40.40% in the trees.Research highlights: These results suggest that A. mangium is a promising afforestation tree species with fast growing, high biomass accumulation and high C sequestration potential.Keywords: Acacia mangium plantations; Biomass; Ecosystem carbon storage; Age-sequence; Vietnam.

Evaluation of Carbon Stock, Nitrogen, and Phosphorus Contents in Forest Soil and Litter at Bintulu’s Acacia mangium Chronosequence Age Stand Plantation, Sarawak, Malaysia

“…Moreover, the result of this study explains that the tree biomass carbon of A. mangium increased significantly with increasing stand age. This finding is consistent with those reported in other previous studies (Herdiyanti & Sulistyawati, 2009;Levan et al, 2020;Palma, 2014).…”

“…This present study uses an allometric model Niiyama et al (2010) developed to estimate below-ground biomass (BGB) for the control site. Levan et al (2020) developed the allometric model to estimate the BGB of A. mangium stands. The conversion factor of 0.47 was used to calculate carbon in AGB and BGB (FAO, 2020b).…”

“…Deadwood standing biomass was determined using the same AGB equations used for live stands. Whist fallen whole tree biomass was estimated using allometric models proposed by Kenzo et al (2015) and Levan et al (2020) for the control and different age of A. mangium stands, respectively. The stump biomass was estimated using equations suggested by Niiyama et al (2010) for the control, while the estimation of stump biomass in A. mangium stands was using equations suggested by Levan et al (2020).…”

“…Whist fallen whole tree biomass was estimated using allometric models proposed by Kenzo et al (2015) and Levan et al (2020) for the control and different age of A. mangium stands, respectively. The stump biomass was estimated using equations suggested by Niiyama et al (2010) for the control, while the estimation of stump biomass in A. mangium stands was using equations suggested by Levan et al (2020). The total deadwood biomass was calculated by standing deadwood, fallen deadwood (whole tree and main stem), and stumps.…”

“…Among the four forest stands of this study, SCC was the highest in the surface soil layer (0-15 cm) and indicated a decreasing trend with depth. It can be explained by the fact that it had the highest quantity of SCC, which significantly increased soil organic matter as a primary source of soil carbon and is higher in topsoil (Levan et al, 2020).…”