Carbon stock estimation in halophytic wooded savannas of Uruguay: An ecosystem approach

IF 3.8 1区 农林科学 Q1 FORESTRY
Andrés Baietto , Andrés Hirigoyen , Carolina Toranza , Franco Schinato , Maximiliano González , Rafael Navarro Cerrillo
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Abstract

Savannas constitute a mixture of trees and shrub patches with a more continuous herbaceous understory. The contribution of this biome to the soil organic carbon (SOC) and above-ground biomass (AGB) carbon (C) stock globally is significant. However, they are frequently subjected to land use changes, promoting increases in CO2 emissions. In Uruguay, subtropical wooded savannas cover around 100,000 ​ha, of which approximately 28% is circumscribed to sodic soils (i.e., subtropical halophytic wooded savannas). Nevertheless, there is little background about the contribution of each ecosystem component to the C stock as well as site-specific allometric equations. The study was conducted in 5 ​ha of subtropical halophytic wooded savannas of the national protected area Esteros y Algarrobales del Río Uruguay. This work aimed to estimate the contribution of the main ecosystem components (e.g., soil, trees, shrubs, and herbaceous plants) to the C stock. Site-specific allometric equations for the most frequent tree species and shrub genus were fitted based on basal diameter (BD) and total height (H). The fitted equations accounted for between 77% and 98% of the aerial biomass variance of Neltuma affinis and Vachellia caven. For shrubs (Baccharis sp.), the adjusted equation accounted for 86% of total aerial biomass. C stock for the entire system was 116.71 ​± ​11.07 ​Mg⋅ha−1, of which 90.7% was allocated in the soil, 8.3% in the trees, 0.8% in the herbaceous plants, and 0.2% in the shrubs. These results highlight the importance of subtropical halophytic wooded savannas as C sinks and their relevance in the mitigation of global warming under a climate change scenario.

乌拉圭盐生林木稀树草原的碳储量估算:一种生态系统方法
热带稀树草原由乔木和灌木斑块混合组成,下层为较连续的草本植物。这种生物群落对全球土壤有机碳(SOC)和地面生物量(AGB)碳(C)存量的贡献很大。然而,它们经常受到土地利用变化的影响,导致二氧化碳排放量增加。在乌拉圭,亚热带稀树草原面积约为 10 万公顷,其中约 28% 属于钠质土壤(即亚热带盐生稀树草原)。然而,关于每个生态系统组成部分对碳储量的贡献以及特定地点的等比数列的背景资料却很少。这项研究在乌拉圭河国家保护区 Esteros y Algarrobales del Río Uruguay 的 5 公顷亚热带盐生林木稀树草原中进行。这项工作旨在估算生态系统主要组成部分(如土壤、树木、灌木和草本植物)对碳储量的贡献。根据基部直径(BD)和总高度(H),对最常见的树种和灌木属进行了特定地点的计量方程拟合。拟合方程占 Neltuma affinis 和 Vachellia caven 气生生物量差异的 77% 到 98%。对于灌木(Baccharis sp.),调整方程占总空中生物量的 86%。整个系统的碳储量为 116.71 ± 11.07 兆克-公顷-1,其中 90.7% 分配在土壤中,8.3% 在树木中,0.8% 在草本植物中,0.2% 在灌木中。这些结果凸显了亚热带盐生木本稀树草原作为碳汇的重要性,以及它们在气候变化情况下减缓全球变暖的相关性。
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来源期刊
Forest Ecosystems
Forest Ecosystems Environmental Science-Nature and Landscape Conservation
CiteScore
7.10
自引率
4.90%
发文量
1115
审稿时长
22 days
期刊介绍: Forest Ecosystems is an open access, peer-reviewed journal publishing scientific communications from any discipline that can provide interesting contributions about the structure and dynamics of "natural" and "domesticated" forest ecosystems, and their services to people. The journal welcomes innovative science as well as application oriented work that will enhance understanding of woody plant communities. Very specific studies are welcome if they are part of a thematic series that provides some holistic perspective that is of general interest.
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