Tropical Peat Accumulation in Central Amazonia
Tropical Peat Accumulation in Central Amazonia
复制标题
亚马逊流域中部的热带泥炭堆积
DOI：
10.1007/s13157-013-0406-0
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发表时间：
2013
期刊：
影响因子：
2
通讯作者：
B. Nelson
中科院分区：
文献类型：
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作者：
O. Lähteenoja;B. Flores;B. Nelson
亚马逊河流域最近被列入关于热带泥炭地在全球碳循环中的作用的讨论，因为据报告，亚马逊河流域西部（秘鲁）有厚达7.5米的大片泥炭地。本研究的目的是探讨泥炭积累在亚马逊河流域中部（巴西）。在7个现场中，6个位于内格罗河流域，1个靠近内格罗河与亚马逊河的交界处，4个有0.10至2.10米厚的泥炭存款。另外两个站点有其他有机土壤类型，不能称为泥炭。只有一个站点没有任何有机存款。四个泥炭地测得的烧失量（LOI）、碳含量和干容重分别为17.7%至97.4%、11%至59%和0.0002至0.572 g cm−3。所有网站被归类为minerotrophic根据pH值和泥炭厚度。这项研究证实，亚马逊泥炭地不仅限于亚马逊西部，也存在于亚马逊中部。我们无法在亚马逊河流域西部找到厚而广泛的泥炭，我们认为这是由于降雨和水文，构造条件，地形，底土类型和火灾频率的差异。
Amazonia has been recently included in discussions on the role of tropical peatlands in the global carbon cycle owing to extensive peatlands up to 7.5 m thick, reported from Western Amazonia (Peru). The aim of this study was to explore peat accumulation in Central Amazonia (Brazil). Of seven field sites, six located in the Negro River basin and one close to the junction of the Negro River with the Amazon, four had a peat deposit from 0.10 to 2.10 m thick. Another two sites had other organic soil type which could not be called peat. Only one site did not have any organic deposit. The loss-on-ignition (LOI), carbon content and dry bulk density, measured for the four peatland sites, varied from 17.7 to 97.4 %, 11 to 59 %, and 0.0002 to 0.572 g cm−3, respectively. All sites were classified as minerotrophic based on pH and peat thickness. The study confirms that Amazonian peatlands are not limited to Western Amazonia but also exist in Central Amazonia. We could not find as thick and extensive peats as in Western Amazonia, which we suggest is due to differences in rainfall and hydrology, tectonic conditions, topography, subsoil type and frequency of fires.