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首页> 外文期刊>Journal of Forest Planning >Estimating Carbon Sequestration by Sugi (Cryptomeria japonica) Plantations According to Site and Management Conditions
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Estimating Carbon Sequestration by Sugi (Cryptomeria japonica) Plantations According to Site and Management Conditions

机译：根据站点和管理条件估算杉杉人工林的固碳量

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Carbon sequestration by plantation forests depends on the site conditions and silvicultural system used. This study estimated the spatial distribution of carbon sequestration by sugi (Cryptomeria japonica) plantations in a study area according to sitequality and thinning regime. The study area was the University of Tokyo Forest in Chiba, which is located on the southern Boso Peninsula, Japan. Site index curves were created from height measurements in sugi plantation experimental plots. Sixty-five sampling points were located in sugi plantations, and the heights of three to five dominant trees around each sample point were measured. The site index was calculated for each sampling point, and the average height at 60 years of age was estimated from the average height at each sampling point using the site index curves. Site factors were calculated from a digital elevation model (DEM) in a geographic information system (GIS). Discriminant functions were developed from five site factors: slope, shaded relief, distance from a ridge, plan curvature, and the wetness index. The correctness rate was 60%. In addition, stand growth was predicted for each site quality using LYCS ver. 2.32 under low thinning at frequencies of 1, 2, 3, and 5 times. Carbon sequestration was estimated from the growth of stand volume multiplied by the basic density, biomass expansion factors, ratio of total biomass to aboveground biomass, and carbon fraction. The estimated carbon storage and sequestration for the study area were mapped using GIS according to the site quality estimated from the five site factors and specified thinning regimes. The average carbon storage per hectare peaked at a thinning frequency of one. Thinning during the young stage increased carbon storage, although frequent and strong thinning regimes decreased carbon storage. The average carbon sequestration per hectare increased with thinning frequency because more frequent thinning leads to faster growth just after thinning in more stands. These maps enabled us to understand the change in carbon storage and sequestration over the study area according to the chosen silvicultural system.
机译：人工林的碳固存取决于场地条件和所使用的造林系统。这项研究根据站点质量和间伐制度估算了研究区域中杉杉（人工柳杉）人工林固碳的空间分布。研究区域是位于日本南部房总半岛的千叶东京森林大学。现场指数曲线是从sugi人工林试验区的高度测量中创建的。在杉林中有65个采样点，并测量了每个采样点周围3至5个优势树的高度。计算每个采样点的位置指数，并使用位置指数曲线从每个采样点的平均高度估算60岁时的平均身高。站点因子是根据地理信息系统（GIS）中的数字高程模型（DEM）计算得出的。判别函数是根据五个位置因素开发的：坡度，阴影起伏，距山脊的距离，平面曲率和湿度指数。正确率为60％。此外，使用LYCS ver。可以预测每个站点质量的林分增长。在低稀疏度下的2.32，频率为1、2、3和5倍。根据林分体积的增长乘以基本密度，生物量膨胀因子，总生物量与地上生物量的比率以及碳分数估算碳固存。根据从五个场地因素和指定的稀疏制度估算的场地质量，使用GIS绘制了研究区域的估计碳储存和封存量。每公顷的平均碳储量在稀疏频率为1时达到峰值。在幼年期减薄增加了碳储量，尽管频繁而强烈的减薄方式降低了碳储量。随着稀疏频率的增加，每公顷平均碳固存量增加，这是因为更频繁的稀疏导致更多林分中稀疏后的更快生长。这些地图使我们能够根据所选的造林系统了解研究区域内碳储存和固存的变化。

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