Estimating Fuel Bed Loadings in Masticated Areas
Estimating Fuel Bed Loadings in Masticated Areas
复制标题
估计咀嚼区域的燃料床负载
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Rosalind Wu
中科院分区：
文献类型：
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作者：
S. Hood;Rosalind Wu
将小树、灌木和枯死的木质材料砍成更小的块以减少燃料床深度的粉碎燃料处理越来越多地用作处理燃料的机械手段。燃料装载信息对于监测燃料的变化很重要。然而，通常使用的平面截取方法可能无法正确估计燃料装载量，因为咀嚼燃料违反了燃料颗粒是圆形的假设。一个采样方法，估计咀嚼燃料床负载使用百分比覆盖，平均深度，和体积密度在三种植被类型：杰弗里松，白冷杉，黄松，甘贝尔橡树，和pinyon杜松。收集咀嚼材料、达夫和枯枝落叶样本以确定堆积密度。载荷计算为体积密度和深度的乘积。总燃料的中值堆密度等于129（杰弗里松-白冷杉），128（黄松-甘贝尔橡树），和226公斤/立方米（松-杜松）。杰弗里松白冷杉类型的载荷与深度之间的相关性最好。松刺柏的体积密度变化最大。覆盖深度法计算的木质物质负荷量一般低于平面截距法计算的负荷量，而覆盖深度法计算的枯枝落叶层和凋落物负荷量高于平面截距法计算的负荷量。
Masticated fuel treatments that chop small trees, shrubs, and dead woody material into smaller pieces to reduce fuel bed depth are used increasingly as a mechani- cal means to treat fuels. Fuel loading information is important to monitor changes in fuels. The commonly used planar intercept method however, may not correctly estimate fuel loadings because masticated fuels violate the assumption that fuel particles are round. A sampling method was developed for estimating masticated fuel bed loadings using percent cover, average depth, and bulk density in three vegetation types: Jeffrey pine-white fi r, ponderosa pine-Gambel oak, and pinyon-juniper. Masticated material, duff, and litter samples were collected to determine bulk densities. Loadings were calculated as the product of bulk density and depth. Total fuel median bulk densities equaled 129 (Jeffrey pine-white fi r), 128 (ponderosa pine-Gambel oak), and 226 kg/m 3 (pinyon-juniper). Correlations between loading and depth were best for the Jeffrey pine-white fi r type. Bulk density was most variable in pinyon-juniper. Woody material loadings calculated from the cover-depth method were generally lower than the loadings calculated from the planar intercept method, while duff and litter load- ings from the cover-depth method were higher than the loadings calculated from the vertical profi le measurements on the planar-intercept transect.