Evaluations of the impacts of forestry practices and their implications for resource management in boreal forests

我们在长期生态监测的基础上，结合近期的实地调查，对日本北部北海道森林选择性采伐的效果进行了评估。在北海道北部的林分中，影响通常是负面的(Yoshida等人。2006年)，特别是招募幼树(野口和吉田，2007年)。对不同物种之间的反应差异进行了详细研究，重点是特别敏感的物种。然而，这些趋势似乎是特定地区的，因为在北海道东部的林分中获得了相反的结果。在经营中，应注意到这种差异，可能是由于气候条件和相应的林下植被(如北部林分存在矮秆竹)的差异造成的。我们还发现土壤干扰对幼树的更新有显著的积极影响(Nagai和Yoshida 2006)。最后，我们研究了将这些数据应用于空间显式的基于个体的模拟模型，这对于增加可持续管理的可行性有价值。虽然我们还需要进一步改进这个模型，但我们已经获得了足够的数据集来估计重要的参数，包括树木对干扰的个体反应(Kubota等人。2006)，适用于具有不同生态特征的多个地区。在初步试验的基础上，我们为利益攸关方记录了关于区域森林管理的日本文件。这些建议将通过改进模拟模型得到进一步发展，将为北海道的可持续资源管理做出巨大贡献。

We evaluated the effects of selection harvesting on forests in Hokkaido, northern Japan, based on the long-term ecological monitorings in combination with recent field surveys. In stands located in northern Hokkaido, the effects were generally negative (Yoshida et al. 2006), especially for recruitment of juvenile trees (Noguchi and Yoshida 2007). The differences in the response among species were examined in detail, with emphasis on particular sensitive species.Nevertheless, these trends were appeared to be region-specific, as the contrasting results were obtained in stands in eastern Hokkaido. In the management, we should note such a difference, probably caused by difference in climate condition and the corresponding understory vegetation (e.g. existence of dwarf bamboos in northern stands). We also found significant positive effects of soil-disturbances, which should be associated with harvesting, on recruitment of juvenile trees (Nagai and Yoshida 2006).Finally, we examined to apply these data to a spatially explicit individual-based simulation model, which is valuable to increase the feasibility of a sustainable management. Although we need further improvement for this model, we have obtained sufficient datasets to estimate significant parameters, including the individual responses of trees to disturbance (Kubota et al. 2006), for multiple regions with different ecological characteristics. Based on a preliminary trial, we documented Japanese papers for stakeholders regarding regional forest management. The suggestions shown there will be further developed by improving the simulation model, and they will contribute greatly to sustainable resource management in Hokkaido.