STAND STRUCTURE AND FINE ROOT PRODUCTION WITH THEIR BENEFACTION TO CARBON STORAGE IN THE SUNDARBANS MANGROVE FOREST

Md. Kamruzzaman; Rifat Rahaman  Hredoy; Md. Minarul Islam

doi:10.53808/KUS.2023.20.02.996-ls

Authors

Md. Kamruzzaman Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh
Rifat Rahaman Hredoy Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh
Md. Minarul Islam Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh

DOI:

https://doi.org/10.53808/KUS.2023.20.02.996-ls

Keywords:

Mangroves;, Stand structures, Biomass carbon, Fine roots, Ingrowth core, Root production.

Abstract

The quantification of fine root production (FRP) and fine root biomass (FRB) in mangrove ecosystem is of utmost importance in gaining insights into ecosystem dynamics. However, these aspects have received limited attention in mangrove forests, primarily due to the considerable time and labor required for accurate assessment. Therefore, our study aims to estimate FRP and FRB stocks in the Sundarbans mangrove forest in Bangladesh, specifically focusing on two distinct saline zones: oligohaline and mesohaline. To accomplish our objectives, we employed sequential soil coring and long-term ingrowth core methods to collect soil samples from 20 study plots, each covering an area of 100 square meters. Additionally, we assessed the forest structure by measuring the tree height and diameter at breast height. Our findings revealed that the mean FRB and FRP across the study area were 12.7 ± 1.1 Mg ha^-1 and 2.3 ± 0.1 Mg ha^-1 yr^-1, respectively. Notably, the oligohaline zone, characterized by lower salinity levels, exhibited higher FRB stocks and FRP compared to the mesohaline zone. Our analysis showed that FRP in the diameter class of 1-2 mm surpassed that of the 0.5-1 mm and ≤0.5 mm classes. In terms of organic carbon, the mean above-ground, below-ground, and total organic carbon were 93.7 ± 18.3, 48.4 ± 7.6, and 142 ± 26 Mg C ha^-1, respectively. Through species importance value (Iv) analysis, we identified Excoecaria agallocha as the dominant species in the oligohaline zone, while Sonneratia apetala exhibited the highest Iv value in the mesohaline area. Heritiera fomes emerged as the primary contributor to total organic carbon, particularly in the oligohaline zone, whereas S. apetala contributed the most organic carbon in the mesohaline zone. These findings emphasize the importance of protecting and conserving mangrove ecosystems as valuable contributors to global carbon dynamics due to their higher fine root production and their contribution to carbon stocks.

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