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首页> 外文期刊>Canadian Journal of Fisheries and Aquatic Sciences >Potential impact of forest harvesting on lake chemistry in south-central Ontario at current levels of acid deposition
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Potential impact of forest harvesting on lake chemistry in south-central Ontario at current levels of acid deposition

机译：在当前酸沉降水平下，森林砍伐对安大略省中南部湖泊化学的潜在影响

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摘要

The potential impact of harvesting on lake chemistry was assessed for similar to1300 lakes in south-central Ontario using a critical loads approach based on the steady-state water chemistry (SSWC) model. The critical load of acidity is currently only exceeded by bulk sulphate deposition in 9% of the lakes if harvesting does not occur. However, the percentage increases to 23%, 56%, and 72% under potential harvesting scenarios that assume wood-only (stem without bark), stem-only, or whole-tree harvesting, respectively. This increase in exceedance of critical load is due to the much lower base cation concentrations in lakes resulting from base cation removals during harvest. For example, only 0.3% of lakes will have Ca2+ concentrations <50 muequiv..L-1 if harvesting does not occur, whereas 52% of lakes will have Ca2+ concentrations <50 muequiv..L-1 if whole-tree harvesting occurs. Harvesting clearly has an enormous potential impact on lake chemistry, which will become more apparent as exchangeable base cation pools in soil decline and acid inputs can no longer be buffered.
机译：使用基于稳态水化学（SSWC）模型的临界负荷方法，评估了安大略省中南部地区与1300个湖泊相似的采伐对湖泊化学的潜在影响。如果不进行收获，目前只有9％的湖泊中大量硫酸盐沉积才超过酸性的临界负荷。但是，在可能仅采用木材（无树皮的茎），仅采用茎或整树采伐的潜在采伐方案下，该百分比分别增加到23％，56％和72％。超出临界负荷的这种增加是由于收获期间去除碱性阳离子而导致湖泊中的碱性阳离子浓度低得多。例如，如果不进行采伐，只有0.3％的湖泊的Ca2 +浓度<50 muequiv..L-1，而如果进行整树采伐，则只有52％的湖泊的Ca2 +浓度<50 muequiv..L-1。收割显然会对湖泊化学产生巨大的潜在影响，随着土壤中可交换的碱性阳离子池的减少和酸的输入不再能被缓冲，这种影响将变得更加明显。

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