Soil carbon inventories and carbon-13 on a latitude transect in Siberia
Soil carbon inventories and carbon-13 on a latitude transect in Siberia
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DOI：
10.3402/tellusb.v54i5.16699
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发表时间：
2002-11
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通讯作者：
M. Bird;H. Šantrůčková;A. Arneth;S. Grigoriev;G. Gleixner;Y. N. Kalaschnikov;J. Lloyd;E. Schulze
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作者：
M. Bird;H. Šantrůčková;A. Arneth;S. Grigoriev;G. Gleixner;Y. N. Kalaschnikov;J. Lloyd;E. Schulze
摘要在西伯利亚中部叶尼西河沿线1000公里的样带上，采集了受干扰最小的成熟植被区(不包括泥炭地)的900多个样品，给出了土壤有机碳清单和碳同位素组成。0-30 cm深度的碳储量范围从1.71kgm−2到7.05kgm SOC2。虽然不能排除沿样带气候或植被变化的影响，但观察到的有机碳储量差异很大程度上是矿物土壤质地变化的结果，细质土壤的碳储量大约是粗质土壤的两倍。0~5 cm土层有机碳的δ13C值变化范围为−2 6.3~−2 8.0‰，相对于0~5 cm土样，5~30 cm土层的δ13C值为0.9±0.8‰(1σ)。所有样本在0-5 cm间隔内的δ13C平均值为−27.1±0.6‰(1σ)，在整个0-30 cm间隔内的平均值为−26.5±0.5‰(1σ)。总的来说，δ13C值在粗质土壤中较高，在细质土壤中较低。樟子松林地土壤的详细采样结果表明，土壤有机碳含量为2.2 2±0.35 kg m−2，0~5 cm土层δ13C平均值为−2 6.3±0.2‰，0~30 cm土层−为2 5.9±0.3‰。最近的焚烧对SOC库存没有影响，但清理导致SOC库存在12年内从0-30厘米平均下降了25%。焚烧和清理对土壤有机碳的δ~(13)C值无明显影响。
Abstract We present soil organic carbon (SOC) inventories and carbon isotope compositions from over 900 samples collected in areas of minimally disturbed mature vegetation on freely drained soils (excluding peatlands) on a 1000 km transect along the Yennisey River, central Siberia. Carbon inventories over 0–30 cm depth range widely from 1.71 to 7.05 kg m−2. While an effect of changing climate or vegetation along the transect cannot be ruled out, the observed differences in SOC inventories are largely the result of variations in mineral soil texture, with inventories in fine-textured soils being approximately double those in coarse-textured soils. The δ13C values of SOC in the 0–5 cm interval ranged from −26.3 to −28.0‰, with δ13C values for the 5–30 cm interval being 0.9 ± 0.8‰ (1σ)enriched in 13C relative to the 0–5 cm samples. The average δ13C value for the 0–5 cm interval for all samples was −27.1 ± 0.6‰ (1σ)and for the full 0–30 cm interval the average was −26.5 ± 0.5‰ (1σ). In general, δ13C values were higher in coarse-textured soils and lower in fine-textured soils. The results of detailed sampling of soils in Pinus sylvestris forest growing on sand near the Zotino flux tower suggest an SOC inventory in these soils of 2.22 ± 0.35 kg m−2 over 30 cm and an average δ13C value of −26.3 ±0.2‰ over the 0–5 cm depth interval and −25.9 ± 0.3‰ over 0–30 cm. Recent burning had no effect on SOC inventories, but clearing has led to an average 25% decrease on SOC inventories from 0–30 cm over 12 yr. Neither burning nor clearing had a discernible effect on the δ13C value of SOC.