Mohammad Kamrul Hasan, Nasima Akther Roshni, Rojina Akter
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引用次数: 0
Abstract
Background
Cropland agroforestry practices are widely adopted over various land ecosystems in Bangladesh, offering the potential to capture carbon (C) and safeguard biodiversity. Lack of accurate assessments of biomass carbon and the diversity of woody perennials in cropland agroforestry practices across different land ecosystems presents a hurdle for the efficient execution of initiatives such as REDD + and comparable mechanisms. The present research sought to estimate biomass carbon stocks and diversity of woody species, exploring the influence of stand structure and diversity indices on these C stocks. We conducted woody perennials’ inventory in 180 sampling quadrates (10 m × 10 m) from cropland agroforestry practices in forest, plains land, and char land ecosystems.
Results
Altogether, we identified 42 woody species; however, the predominant species in three land ecosystems were Acacia auriculiformis, Gmelina arborea, and Tectona grandis. Swietenia macrophylla and Swietenia mahogany contributed the greatest amount of carbon stocks. Carbon stocks in woody perennials were 30–44% higher in plains land and forest land ecosystems compared to the char land ecosystem, attributable to significantly increased stand density, basal area and diameter. The significantly highest Shannon–Wiener index (2.75) and Margalef’s richness index (3.37) were found in forest land compared to other ecosystems. The highest total carbon stocks (131.27 Mg C ha−1) of cropland agroforestry were found in the forest land ecosystem, which had the greatest soil organic carbon, density, and richness of woody perennials. A rise in the richness and diversity index of woody species by one unit led to a concurrent increase of 12 and 8 Mg C ha−1 in carbon stocks, respectively.
Conclusions
Cropland agroforestry practices in the forest land ecosystem are more diverse and could sequester more carbon stock than in the other two land ecosystems in Bangladesh. The biomass C stocks of woody species were positively correlated with stand structure and diversity, having the potential to contribute to biodiversity conservation in Bangladesh and other similar countries.
孟加拉国的各种土地生态系统广泛采用农田农林业实践，提供了捕获碳(C)和保护生物多样性的潜力。在不同土地生态系统的农田农林业实践中，缺乏对生物质碳和多年生木本植物多样性的准确评估，这对有效执行REDD +等倡议和类似机制构成了障碍。本研究旨在估算木本物种的生物量碳储量和多样性，探讨林分结构和多样性指数对这些碳储量的影响。在森林、平原和炭地生态系统的180个样方（10 m × 10 m）上进行了木本多年生植物的清查。结果共鉴定出42种木本植物；3个陆地生态系统的优势种均为金合欢（Acacia auriculformis）、木兰花（Gmelina arborea）和大地构造（Tectona grandis）。大叶甜菊和红木甜菊的碳储量贡献最大。平原和林地生态系统多年生木本植物的碳储量比炭地生态系统高30-44%，这是由于林分密度、基面积和直径显著增加所致。林地的Shannon-Wiener指数（2.75）和Margalef丰富度指数（3.37）显著高于其他生态系统。土壤有机碳、密度和丰富度均以林地生态系统最高，为131.27 Mg C ha−1。木本物种丰富度和多样性指数每增加1个单位，碳储量分别增加12和8 Mg C ha−1。结论孟加拉国林地生态系统的农田农林业实践比其他两种土地生态系统更多样化，能够吸收更多的碳储量。木本物种的生物量C储量与林分结构和多样性呈正相关，对孟加拉国和其他类似国家的生物多样性保护具有潜在的促进作用。
期刊介绍：
Carbon Balance and Management is an open access, peer-reviewed online journal that encompasses all aspects of research aimed at developing a comprehensive policy relevant to the understanding of the global carbon cycle.
The global carbon cycle involves important couplings between climate, atmospheric CO2 and the terrestrial and oceanic biospheres. The current transformation of the carbon cycle due to changes in climate and atmospheric composition is widely recognized as potentially dangerous for the biosphere and for the well-being of humankind, and therefore monitoring, understanding and predicting the evolution of the carbon cycle in the context of the whole biosphere (both terrestrial and marine) is a challenge to the scientific community.
This demands interdisciplinary research and new approaches for studying geographical and temporal distributions of carbon pools and fluxes, control and feedback mechanisms of the carbon-climate system, points of intervention and windows of opportunity for managing the carbon-climate-human system.
Carbon Balance and Management is a medium for researchers in the field to convey the results of their research across disciplinary boundaries. Through this dissemination of research, the journal aims to support the work of the Intergovernmental Panel for Climate Change (IPCC) and to provide governmental and non-governmental organizations with instantaneous access to continually emerging knowledge, including paradigm shifts and consensual views.
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