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首页> 外文期刊>Polar biology >Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape Bounty, Nunavut,Canada
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Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape Bounty, Nunavut,Canada

机译：活动层脱离对高北极生态系统中的碳交换的短期影响，Cape Bounty，努纳武特，加拿大

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Localized permafrost disturbances such as active layer detachments (ALDs) are increasing in frequency and severity across the Canadian Arctic impacting terrestrial ecosystem functioning. However, the contribution of permafrost disturbance-carbon feedbacks to the carbon (C) balance of Arctic ecosystems is poorly understood. Here, we explore the short-term impact of active layer detachments (ALDs) on carbon dioxide (CO_2) exchange in a High Arctic semi-desert ecosystem by comparing midday C exchange between undisturbed areas, moderately disturbed areas (intact islands of vegetation within an ALD), and highly disturbed areas (non-vegetated areas due to ALD). Midday C exchange was measured using a static chamber method between June 23 and August 8 during the 2009 and 2010 growing seasons. Results show that areas of high disturbance had significantly reduced gross ecosystem exchange and ecosystem respiration (R_E) compared to control and moderately disturbed areas. Moderately disturbed areas showed significantly enhanced net ecosystem exchange compared to areas of high disturbance, but were not significantly different from control areas. Disturbance did not significantly impact soil thermal, physical or chemical properties. According to average midday fluxes, ALDs as a whole (moderately disturbed areas: -1.942 umol m~(-2) s~(-1)+ highly disturbed areas: 2.969 μmol m~(-2) s~(-1)) were a small CO_2 source of 1.027 μmol m~(-2) s~(-1) which did not differ significantly from average midday fluxes in control areas 1.219 μmol m~(-2) s~(-1). The findings of this study provide evidence that the short-term impacts of ALDs on midday, net C exchange and soil properties in a High Arctic semi-desert are minimal.
机译：在影响北极的陆地生态系统功能的整个加拿大北极地区，诸如活动层脱离（ALD）等局部多年冻土扰动的频率和严重性都在增加。但是，人们对永久冻土干扰碳反馈对北极生态系统碳（C）平衡的贡献知之甚少。在这里，我们通过比较未扰动区域，中度扰动区域（植被中完整的岛屿）之间的午间C交换，探讨了北极高半沙漠生态系统中活性层脱离（ALDs）对二氧化碳（CO_2）交换的短期影响。 ALD）和高度干扰的区域（由于ALD而无植被的区域）。在2009年和2010年生长季节的6月23日至8月8日之间，采用静态室法测量了午间C交换。结果表明，与控制区和中度扰动区相比，高扰动区显着降低了总生态系统交换和生态系统呼吸（R_E）。与高干扰地区相比，中度干扰地区显示出显着增强的净生态系统交换，但与控制地区没有显着差异。扰动并没有显着影响土壤的热，物理或化学性质。根据平均午间通量，整个ALD（中度扰动区域：-1.942 umol m〜（-2）s〜（-1）+高扰动区域：2.969μmolm〜（-2）s〜（-1））是一个1.027μmolm〜（-2）s〜（-1）的小型CO_2源，与控制区域1.219μmolm〜（-2）s〜（-1）的平均午间通量没有显着差异。这项研究的发现提供了证据，表明在高北极半沙漠中，ALDs对中午，净碳交换和土壤特性的短期影响很小。

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