Tropical peatland carbon storage linked to global latitudinal trends in peat recalcitrance.
Tropical peatland carbon storage linked to global latitudinal trends in peat recalcitrance.
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DOI：
10.1038/s41467-018-06050-2
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发表时间：
2018-09-07
影响因子：
16.6
通讯作者：
Chanton JP
中科院分区：
文献类型：
--
作者：
Hodgkins SB;Richardson CJ;Dommain R;Wang H;Glaser PH;Verbeke B;Winkler BR;Cobb AR;Rich VI;Missilmani M;Flanagan N;Ho M;Hoyt AM;Harvey CF;Vining SR;Hough MA;Moore TR;Richard PJH;De La Cruz FB;Toufaily J;Hamdan R;Cooper WT;Chanton JP
泥炭地代表着大型陆地碳库。鉴于大多数泥炭堆积在北方地区，那里的低温和水饱和度保存了有机质，因此（亚）热带地区泥炭的存在仍然是个谜。在这里，我们研究了从北极到热带的纬度横断面的泥炭和植物化学。与近地表高纬度泥炭相比，近地表低纬度泥炭的碳水化合物含量较低，芳香族含量较高，从而降低了氧化态并导致了顽抗性。尽管气温温暖，这种顽固性使得泥炭能够在（亚）热带地区持续存在。因为我们观察到高纬度泥炭中碳水化合物含量随深度的变化类似的下降，所以我们的数据解释了最近的野外规模深层泥炭变暖实验，其中尽管温度升高至 9°C，但更深的泥炭仍保持稳定。我们认为，高纬度深层泥炭库在面对气候变化时可能会因其最终较低的碳水化合物和较高的芳香成分而保持稳定，类似于热带泥炭。大型泥炭地存在于高纬度地区，因为洪水条件和寒冷的温度会减缓分解速度，因此（亚）热带泥炭的存在是神秘的。在这里，作者表明，低纬度泥炭之所以得以保存，是因为碳水化合物含量较低，芳香物质含量较高，导致化学不顺从。
Peatlands represent large terrestrial carbon banks. Given that most peat accumulates in boreal regions, where low temperatures and water saturation preserve organic matter, the existence of peat in (sub)tropical regions remains enigmatic. Here we examined peat and plant chemistry across a latitudinal transect from the Arctic to the tropics. Near-surface low-latitude peat has lower carbohydrate and greater aromatic content than near-surface high-latitude peat, creating a reduced oxidation state and resulting recalcitrance. This recalcitrance allows peat to persist in the (sub)tropics despite warm temperatures. Because we observed similar declines in carbohydrate content with depth in high-latitude peat, our data explain recent field-scale deep peat warming experiments in which catotelm (deeper) peat remained stable despite temperature increases up to 9 °C. We suggest that high-latitude deep peat reservoirs may be stabilized in the face of climate change by their ultimately lower carbohydrate and higher aromatic composition, similar to tropical peats. Large peatlands exist at high latitudes because flooded conditions and cold temperatures slow decomposition, so the presence of (sub)tropical peat is enigmatic. Here the authors show that low-latitude peat is preserved due to lower carbohydrate and greater aromatic content resulting in chemical recalcitrance.
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影响因子：
5.2
作者：
Chasar, LS;Chanton, JP;Rivers, JS
通讯作者：
Rivers, JS
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