Landslides are one of the main reasons for permafrost degradation in high latitudes. Any landslides consist of different top-down slope zones: removal, transit-depletion, and accumulation zones. These slope parts can demonstrate different successional behavior of plant community and carbon (C) cycling during post-sliding seral stages. To address this issue, soil respiration (SR), hydrothermal conditions (mineral soil temperature at a depth of 5 cm (ST5, °C), and gravimetric soil water content at a depth of 0–5 cm in mineral soil horizon (SWC5, %)), total soil C (TC) and nitrogen (TN) contents, and soil microbial activity at the middle (depletion zone) and lower (accumulation zone) slope parts of the landslides with different history have been studied. The most significant differences between the middle and lower slope positions were found at the ground microsites (or G-plots) of the L2001 landslide. Thus, here, a midslope part occurred to be a high source of C compared to the lower part. Midslope of L2001 was characterized by significantly higher SR at G-plots as well because of better hydrothermal conditions and more intensive vegetation regeneration. The accumulation zone of L2001 characterized by the lower SR despite significantly higher microbial activity due to the high nutrient level of the soil moved from the top, likely favored to promotion of the soil C stabilization processes. Despite the registered ST5 differences in the E-plots and the G-plots between middle and lower slope positions of the L1972 landslide, SR, TC, TN, and soil microbial activity did not differ significantly.

中文翻译：

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西伯利亚多年冻土滑坡耗竭区和堆积区土壤过程的比较研究

滑坡是高纬度地区多年冻土退化的主要原因之一。任何滑坡都由不同的自上而下的斜坡区组成：移除区、运输耗竭区和堆积区。这些斜坡部分可以展示植物群落和碳（C）循环在滑动后序列阶段的不同演替行为。为了解决这个问题，土壤呼吸（SR）、热液条件（5 cm 深度处的矿质土壤温度（ST5，°C）和矿质土壤层中 0-5 cm 深度处的重力土壤含水量（SWC5， %))、土壤总碳 (TC) 和氮 (TN) 含量，以及不同历史滑坡中（耗竭区）和下（堆积区）斜坡部分的土壤微生物活动。在 L2001 滑坡的地面微点（或 G 地块）中发现了中坡和下坡位置之间最显着的差异。因此，在这里，与下部相比，中坡部分似乎是 C 的高来源。由于更好的热液条件和更密集的植被更新，L2001 中坡的特征在于 G 地块的 SR 显着更高。L2001 的积累区以较低的 SR 为特征，尽管由于土壤的高养分水平从顶部移动，微生物活性显着提高，可能有利于促进土壤 C 稳定过程。尽管在 L1972 滑坡的中下坡位置之间的 E 地块和 G 地块中记录的 ST5 差异，SR、TC、TN 和土壤微生物活动没有显着差异。