<br>反复飓风对湿润热带森林土壤有机碳年龄的影响,Global Change Biology

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反复飓风对湿润热带森林土壤有机碳年龄的影响
Global Change Biology ( IF 10.8 ) Pub Date : 2024-03-30 , DOI: 10.1111/gcb.17265
Allegra C Mayer _{1,

2,

3} , Karis J McFarlane ₂ , Whendee L Silver ₁

Affiliation

随着气候变化，飓风频率和强度的增加可能会影响热带森林的土壤有机碳 (C) 储量。我们研究了波多黎各卢基洛实验森林土壤中 30 年来（跨越多次飓风）土壤中碳的循环情况以及随深度的变化。我们使用土壤碳库和通量的非线性矩阵模型（“soilR”），并用土壤和凋落物调查数据约束参数。 1988 年和 2018 年，在地形梯度上的三个土壤深度测量了土壤化学以及稳定同位素和放射性碳同位素。我们的结果表明，1989 年、1998 年和 2017 年两次严重飓风造成的脉冲和随后输入的减少导致平均凌日速度加快相对于 30 年来持续投入的模拟对照土壤，0-10 厘米和 35-60 厘米深度的土壤 C 的倍数。 1988 年至 2018 年间，吸留碳库增加，δ 13所有池中的碳含量均下降，而颗粒物和矿物质相关碳含量的变化无法检测到。 1988年和2018年之间的差异表明，飓风扰动导致了封闭的轻碳库的稀释，年轻的、碎片沉积的碳的涌入，以及颗粒和矿物相关库中老旧和年轻碳的可能的微生物清除。这些影响导致土壤总碳库更年轻，平均传输时间更快。我们的研究结果表明，强烈飓风频率的增加将加快热带森林中碳循环的速度，使土壤碳对未来热带森林压力源更加敏感。

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The effect of repeated hurricanes on the age of organic carbon in humid tropical forest soil

Increasing hurricane frequency and intensity with climate change is likely to affect soil organic carbon (C) stocks in tropical forests. We examined the cycling of C between soil pools and with depth at the Luquillo Experimental Forest in Puerto Rico in soils over a 30‐year period that spanned repeated hurricanes. We used a nonlinear matrix model of soil C pools and fluxes (“soilR”) and constrained the parameters with soil and litter survey data. Soil chemistry and stable and radiocarbon isotopes were measured from three soil depths across a topographic gradient in 1988 and 2018. Our results suggest that pulses and subsequent reduction of inputs caused by severe hurricanes in 1989, 1998, and two in 2017 led to faster mean transit times of soil C in 0–10 cm and 35–60 cm depths relative to a modeled control soil with constant inputs over the 30‐year period. Between 1988 and 2018, the occluded C stock increased and δ13C in all pools decreased, while changes in particulate and mineral‐associated C were undetectable. The differences between 1988 and 2018 suggest that hurricane disturbance results in a dilution of the occluded light C pool with an influx of young, debris‐deposited C, and possible microbial scavenging of old and young C in the particulate and mineral‐associated pools. These effects led to a younger total soil C pool with faster mean transit times. Our results suggest that the increasing frequency of intense hurricanes will speed up rates of C cycling in tropical forests, making soil C more sensitive to future tropical forest stressors.

更新日期：2024-03-30

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