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首页> 外文期刊>Forest Ecology and Management >Stand carbon stocks and soil carbon and nitrogen storage for riparian and upland forests of boreal lakes in northeastern Ontario.
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Stand carbon stocks and soil carbon and nitrogen storage for riparian and upland forests of boreal lakes in northeastern Ontario.

机译：安大略东北部北方湖泊的河岸和高地森林的林分碳储量和土壤碳氮存储量。

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The establishment of shoreline reserves (buffer strips) has guided riparian forest management in Ontario for many years. A riparian area is defined as the transitional zone between the aquatic and terrestrial environments and therefore is also known as the aquatic/terrestrial ecotone. While many functions of riparian forests have been recognized and well studied, less is known about their potential to sequester C and whether this potential differs from other areas in the boreal forest landscape. Increased harvesting pressure due to decreased wood supply in Ontario and debate about the effectiveness of the current reserve guidelines has resulted in a renewed interest in harvesting riparian forests. In this study, riparian and upslope forest C and soil C and N storage were quantified for 21 lakes shorelines at the Esker Lakes Research Area, a boreal forest ecosystem in northeastern Ontario, Canada. Objectives were to compare the C and N storage potential of riparian forests with those of adjacent upland forests, and to examine the potential impacts of harvesting on C stocks in riparian zones of the boreal forest. Riparian forests did not differ from upslope stands in terms of total aboveground overstorey C storage although there were significant differences in stocking density and species composition. However, a greater proportion of total site C in riparian areas was stored in the overstorey tree layer (>5 cm dbh) compared to upslope areas. Forest floor layers were deeper and stored more C and N in riparian forest stands in comparison to upslope stands. In contrast, mineral soil in upslope stands had greater C and N storage than mineral soil horizons within the riparian forest. As a result, the riparian organic horizons comprise a larger percentage of the overall soil storage of C and N than upslope layers. Currently practiced full-tree harvesting would result in a removal of approximately 76% of total aboveground C (17% of the ecosystem C) in upslope stands compared to 98% of total aboveground C (35% of the ecosystem C) in riparian forests. Selective or modified harvesting in riparian zones could decrease C removal to levels equal to that obtained by full-tree harvesting in upslope areas..
机译：海岸线保护区（缓冲带）的建立多年来一直指导着安大略省的沿岸森林管理。河岸地区被定义为水生和陆地环境之间的过渡区，因此也被称为水生/陆地过渡带。尽管河岸带森林的许多功能已经得到公认和充分研究，但对其封存碳的潜力以及这种潜力是否与北方森林景观中的其他地区不同的了解却很少。由于安大略省木材供应减少，砍伐压力增加，有关现行保护区准则有效性的争论导致人们对砍伐河岸森林重新产生了兴趣。在这项研究中，对加拿大安大略省东北部的北方森林生态系统Esker Lakes研究区的21个湖泊海岸线的河岸和上坡森林C和土壤C和N的储量进行了量化。目的是比较河岸林和邻近山地林的碳和氮储量，并研究采伐对北方森林河岸带碳储量的潜在影响。沿岸森林在地上总层积碳储量方面与上坡林分没有差异，尽管种群密度和物种组成存在显着差异。然而，与上坡地区相比，河岸地区的总站点C的比例更大，存储在过高的树木层（> 5 cm dbh）中。与上坡林分相比，河岸林分林地表层更深，碳和氮含量更高。相反，上坡林地的矿质土壤比河岸森林内的矿质土壤具有更高的碳和氮储量。结果，与上坡层相比，河岸有机层占土壤总碳和氮的百分比更高。当前实践的全树采伐将导致坡上林地中大约76％的地上C（占生态系统C的17％）被清除，而沿岸林地中的地上C则占98％（生态系统C的35％）。在河岸带进行选择性或改良采伐可以将碳清除量降低到与在上坡地区全树采伐所获得的水平相等。

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