碳库是否因厄瓜多尔的热带干燥森林和季节而异?来自时空评估的实验证据

IF 4.4 Q3 ENGINEERING, ENVIRONMENTAL
Michael Macías-Pro, Emilio Jarre Castro, Juan Manuel Moreira Castro, José María Montoya Terán and Ezequiel Zamora-Ledezma
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引用次数: 0

摘要

热带干林(tdf)是重要的碳库,但其碳储存动态仍然知之甚少,特别是跨季节、森林亚型和物种贡献。本研究考察了厄瓜多尔沿海三种TDF亚型的碳库——土壤有机碳(SOC)、地上生物量碳(CAGB)和凋落物碳(c -凋落物)。在雨季和旱季每半年监测12个100平方米的样地,利用外推法评估森林斑块的总碳储量。在所有类型和季节中,有机碳是主要的碳库,与干旱期(LDF, 54.70 Mg ha−1,LSF, 53.35 Mg ha−1,SPF, 39.39 Mg ha−1)相比,雨季对有机碳稳定性的贡献更大(LSF, 75.51 Mg ha−1,LDF, 70.01 Mg ha−1,SPF, 69.27 Mg ha−1)。CAGB和c -凋落物表现出明显的季节变化,凋落物在旱季达到峰值,特别是在LSF (0.4 Mg ha−1)。在不同亚型中,LSF的总碳密度平均为94.0 Mg ha - 1, SPF为67.4 Mg ha - 1, LDF为99.9 Mg ha - 1。植物种类对CAGB有显著影响。在LSF中,integerrima对CAGB的贡献最大(6.4 ~ 6.7 Mg ha−1),而C. eggersii对SPF的贡献最大(4.5 ~ 4.4 Mg ha−1)。在LDF中,C. lutea是主要贡献者,储存了13.8 ~ 13.9 Mg ha−1的生物量碳。对森林斑块的外推结果显示了显著的空间差异,其中低密度森林(LDF)固碳最多(526 133.3 Mg),其次是SPF (463 133.0 Mg)和低密度森林(3113.3 Mg)。这些发现强调了物种组成、气候变率和森林结构在碳固存中的关键作用,强调了有必要制定有针对性的保护策略来减轻气候变化的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Does the carbon pool vary among Ecuador's tropical dry forests and seasons? Experimental evidence from spatio-temporal assessments

Does the carbon pool vary among Ecuador's tropical dry forests and seasons? Experimental evidence from spatio-temporal assessments

Tropical dry forests (TDFs) are critical carbon reservoirs, yet their carbon storage dynamics remain poorly understood, particularly across seasons, forest subtypes, and species′ contributions. This study examined carbon pools—soil organic carbon (SOC), aboveground biomass carbon (CAGB), and litterfall carbon (C-litterfall)—across three TDF subtypes along the Ecuadorian coast. Twelve 100 m2 plots were monitored semi-annually during rainy and dry seasons, with extrapolations made to assess total forest patch carbon stocks. SOC was the dominant carbon pool across all subtypes and seasons, with rainy periods contributing to greater SOC stability (LSF, 75.51 Mg ha−1; LDF, 70.01 Mg ha−1; SPF, 69.27 Mg ha−1) compared to dry periods (LDF, 54.70 Mg ha−1; LSF, 53.35 Mg ha−1; SPF, 39.39 Mg ha−1). CAGB and C-litterfall displayed significant seasonal variation, with litterfall peaking in the dry season, particularly in LSF (0.4 Mg ha−1). Across subtypes, total carbon densities averaged 94.0 Mg ha−1 in LSF, 67.4 Mg ha−1 in SPF, and 99.9 Mg ha−1 in LDF. Plant species significantly influenced CAGB. In LSF, T. integerrima contributed the most to CAGB (6.4–6.7 Mg ha−1), while C. eggersii dominated in SPF (4.5–4.4 Mg ha−1). In LDF, C. lutea was the leading contributor, storing 13.8–13.9 Mg ha−1 of biomass carbon. Extrapolation to forest patches revealed substantial spatial differences, with LDF sequestering the most carbon (526 133.3 Mg), followed by SPF (463 133.0 Mg) and LSF (3113.3 Mg). These findings underscore the critical roles of species composition, climatic variability, and forest structure in carbon sequestration, emphasizing the need for tailored conservation strategies to mitigate climate change impacts.

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