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首页> 外文期刊>Ecosystems >Landscape-Scale Variability of Organic Carbon Burial by SW Greenland Lakes
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Landscape-Scale Variability of Organic Carbon Burial by SW Greenland Lakes

机译：SW Greenland Lakes的有机碳的景观规模变异

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Lakes are a key feature of arctic landscapes and can be an important component of regional organic carbon (OC) budgets, but C burial rates are not well estimated. Pb-210-dated sediment cores and carbon and organic matter (as loss-on-ignition) content were used to estimate OC burial for 16 lakes in SW Greenland. Burial rates were corrected for sediment focusing using the Pb-210 flux method. The study lakes span a range of water chemistries (conductivity range 25-3400 mu S cm(-1)), areas (< 4-100 ha) and maximum depths (similar to 10-50 m). The regional average focusing-corrected OC accumulation rate was similar to 2 g C m(-2) y(-1) prior to 1950 and 3.6 g C m(-2) y(-1) after 1950. Among-lake variability in post-1950 OC AR was correlated with in-lake dissolved organic carbon concentration, conductivity, altitude and location along the fjord. Twelve lakes showed an increase in mean OC AR over the analyzed time period, similar to 1880-2000; as the study area was cooling until recently, this increase is probably attributable to other global change processes, for example, altered inputs of N or P. There are similar to 20,000 lakes in the study area ranging from similar to 1 ha to more than 130 km(2), although over 83% of lakes are less than 10 ha. Extrapolating the mean post-1950 OC AR (3.6 g C m(-2) y(-1)) to all lakes larger than 1000 ha and applying a lower rate of similar to 2 g C m(-2) y(-1) to large lakes (> 1000 ha) suggests a regional annual lake OC burial rate of similar to 10.14 x 10(9) g C y(-1) post 1950. Given the low C content of soils in this area, lakes represent a substantial regional C store.
机译：湖泊是北极风景的关键特征，可以成为区域有机碳（OC）预算的重要组成部分，但C埋税率并不估计。 PB-210日沉积物芯和碳和有机物（作为点火丧失）含量用于估计SW格陵兰岛16湖的OC埋葬。使用PB-210通量法对沉积物校正埋藏率。研究湖泊跨越一系列水化学物质（电导率范围为25-3400亩（-1）），区域（<4-100公顷）和最大深度（类似于10-50米）。在1950年之前，区域平均聚焦校正的OC累积率与1950年之前的2g C m（-2）y（-1）相似，在1950年之后的3.6g C m（-2）y（-1）。在湖中变异性1950年代后，沿湖溶解的有机碳浓度，电导率，高度和沿着峡湾的位置相关。十二个湖泊在分析的时间段内显示平均oc ar增加，类似于1880-2000;随着研究区域的冷却直到最近，这种增加可能归因于其他全局改变过程，例如，N或P的改变输入。研究区内的20,000湖等于20,000湖泊，范围从1公顷到130多个KM（2），虽然超过83％的湖泊不到10公顷。推断平均后的1950℃（3.6g C m（-2）y（-1））大于1000公顷的所有湖泊，并施加与2g c m（-2）y相似的较低速率（-1 ）到大湖（> 1000公顷）建议，1950年的10.14 x 10（9）G C y（-1）张柱的区域年度湖泊墓汇率。鉴于该地区的土壤的低C含量，湖泊代表了一个实质性区域c商店。

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