Net primary productivity and litter decomposition rates in two distinct Amazonian peatlands,Global Change Biology

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Net primary productivity and litter decomposition rates in two distinct Amazonian peatlands
Global Change Biology ( IF 10.8 ) Pub Date : 2024-08-20 , DOI: 10.1111/gcb.17436
G C Dargie ₁ , J Del Aguila-Pasquel ₂ , C J Córdova Oroche ₂ , J Irarica Pacaya ₂ , J Reyna Huaymacari ₂ , T R Baker ₁ , A Hastie ₃ , E N Honorio Coronado _{4,

5} , S L Lewis _{1,

6} , K H Roucoux ₄ , E T Mitchard _{7,

8} , M Williams ₇ , F C H Draper ₉ , I T Lawson ₄

Affiliation

Measurements of net primary productivity (NPP) and litter decomposition from tropical peatlands are severely lacking, limiting our ability to parameterise and validate models of tropical peatland development and thereby make robust predictions of how these systems will respond to future environmental and climatic change. Here, we present total NPP (i.e., above- and below-ground) and decomposition data from two floristically and structurally distinct forested peatland sites within the Pastaza Marañón Foreland Basin, northern Peru, the largest tropical peatland area in Amazonia: (1) a palm (largely Mauritia flexuosa) dominated swamp forest and (2) a hardwood dominated swamp forest (known as ‘pole forest’, due to the abundance of thin-stemmed trees). Total NPP in the palm forest and hardwood-dominated forest (9.83 ± 1.43 and 7.34 ± 0.84 Mg C ha⁻¹ year⁻¹, respectively) was low compared with values reported for terra firme forest in the region (14.21–15.01 Mg C ha⁻¹ year⁻¹) and for tropical peatlands elsewhere (11.06 and 13.20 Mg C ha⁻¹ year⁻¹). Despite the similar total NPP of the two forest types, there were considerable differences in the distribution of NPP. Fine root NPP was seven times higher in the palm forest (4.56 ± 1.05 Mg C ha⁻¹ year⁻¹) than in the hardwood forest (0.61 ± 0.22 Mg C ha⁻¹ year⁻¹). Above-ground palm NPP, a frequently overlooked component, made large contributions to total NPP in the palm-dominated forest, accounting for 41% (14% in the hardwood-dominated forest). Conversely, Mauritia flexuosa litter decomposition rates were the same in both plots: highest for leaf material, followed by root and then stem material (21%, 77% and 86% of mass remaining after 1 year respectively for both plots). Our results suggest potential differences in these two peatland types' responses to climate and other environmental changes and will assist in future modelling studies of these systems.

中文翻译：

两个不同的亚马逊泥炭地的净初级生产力和凋落物分解率

严重缺乏对热带泥炭地净初级生产力（NPP）和枯落物分解的测量，限制了我们对热带泥炭地开发模型进行参数化和验证的能力，从而限制了我们对这些系统将如何应对未来环境和气候变化做出可靠预测的能力。在这里，我们提供了秘鲁北部帕斯塔萨马拉尼翁前陆盆地（亚马逊流域最大的热带泥炭地区域）内两个植物区系和结构不同的森林泥炭地地点的总 NPP（即地上和地下）和分解数据：(1)棕榈（主要是毛里求斯毛里求斯）占主导地位的沼泽森林和（2）阔叶林占主导地位的沼泽森林（由于富含细茎树木，被称为“极地森林”）。棕榈林和阔叶林为主的森林的总 NPP（分别为 9.83 ± 1.43 和 7.34 ± 0.84 Mg C ha ^-1年^-1 ）低于该地区陆地森林的报告值（14.21–15.01 Mg C ha -1 ）。 ^-1年^-1 ）和其他地方的热带泥炭地（11.06 和 13.20 Mg C ha ^-1年^-1 ）。尽管两种森林类型的NPP总量相似，但NPP的分布却存在很大差异。棕榈林的细根 NPP (4.56 ± 1.05 Mg C ha ^-1年^-1 ) 比阔叶林 (0.61 ± 0.22 Mg C ha ^-1年^-1 ) 高七倍。地上棕榈NPP是一个经常被忽视的组成部分，在棕榈为主的森林中对NPP总量的贡献很大，占41%（在阔叶林中为14%）。相反，两个地块中的毛里求斯枯枝落叶分解率相同：叶材料最高，其次是根，然后是茎材料（两个地块一年后分别剩余质量的 21%、77% 和 86%）。我们的结果表明这两种泥炭地类型对气候和其他环境变化的响应存在潜在差异，并将有助于这些系统的未来建模研究。

更新日期：2024-08-21

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