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首页> 外文期刊>Carbon balance and management >Effects of harvest, fire, and pest/pathogen disturbances on the West Cascades ecoregion carbon balance
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Effects of harvest, fire, and pest/pathogen disturbances on the West Cascades ecoregion carbon balance

机译：采伐，火灾和病虫/病原体干扰对西部喀斯喀特生态区碳平衡的影响

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Background Disturbance is a key influence on forest carbon dynamics, but the complexity of spatial and temporal patterns in forest disturbance makes it difficult to quantify their impacts on carbon flux over broad spatial domains. Here we used a time series of Landsat remote sensing images and a climate-driven carbon cycle process model to evaluate carbon fluxes at the ecoregion scale in western Oregon. Results Thirteen percent of total forest area in the West Cascades ecoregion was disturbed during the reference interval (1991-2010). The disturbance regime was dominated by harvesting (59 % of all area disturbed), with lower levels of fire (23 %), and pest/pathogen mortality (18 %). Ecoregion total Net Ecosystem Production was positive (a carbon sink) in all years, with greater carbon uptake in relatively cool years. Localized carbon source areas were associated with recent harvests and fire. Net Ecosystem Exchange (including direct fire emissions) showed greater interannual variation and became negative (a source) in the highest fire years. Net Ecosystem Carbon Balance (i.e. change in carbon stocks) was more positive on public that private forestland, because of a lower disturbance rate, and more positive in the decade of the 1990s than in the warmer and drier 2000s because of lower net ecosystem production and higher direct fire emissions in the 2000s. Conclusion Despite recurrent disturbances, the West Cascades ecoregion has maintained a positive carbon balance in recent decades. The high degree of spatial and temporal resolution in these simulations permits improved attribution of regional carbon sources and sinks.
机译：背景扰动是对森林碳动态的关键影响，但是森林扰动的时空格局的复杂性使得难以量化其对广阔空间域内碳通量的影响。在这里，我们使用了Landsat遥感图像的时间序列和气候驱动的碳循环过程模型来评估俄勒冈州西部生态区范围内的碳通量。结果在参考间隔内（1991年至2010年），西部喀斯喀特生态区的总森林面积的13％被破坏。干扰方式主要是收割（占受干扰地区的59％），火势较低（23％）和病虫/病原体死亡率（18％）。生态区净生态系统总产量在所有年份均为正（碳汇），而相对凉爽的年份碳吸收量更大。局部碳源地区与最近的收成和大火有关。净生态系统交换（包括直接火灾排放）表现出较大的年际变化，并在最高火灾年份变为负值（来源）。公众对生态系统的净碳平衡（即碳储量的变化）比私人林地更为积极，这是因为扰动率较低，而在1990年代的10年代，由于生态系统的净产量和净值较低，与积极和干旱的2000年代相比，这种状况更为积极。 2000年代的直接火灾排放量更高。结论尽管有反复的干扰，但在最近几十年中，西部喀斯喀特生态区一直保持着积极的碳平衡。这些模拟中的高度时空分辨率可以改善区域碳源和汇的归属。

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