Comparing three sampling techniques for estimating fine woody down dead biomass
Comparing three sampling techniques for estimating fine woody down dead biomass
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比较三种估算细木本死亡生物量的采样技术
DOI：
10.1071/wf13038
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发表时间：
2013
影响因子：
3.1
通讯作者：
Kathy Gray
中科院分区：
文献类型：
--
作者：
R. Keane;Kathy Gray
设计木质燃料采样方法，以快速、准确和有效地评估相关空间尺度上的生物量，需要广泛了解每种采样方法的优势、劣势和权衡。在这项研究中，我们比较了三种常用采样方法（平面截距，固定区域微图和光负载）的各种修改，以人工燃料床和已知燃料负载为参考，预测细木表面燃料成分（1-,10-,100-hfuels）。对采样方法进行了两种修改：(1)只测量直径，同时测量直径和长度；(2)测量直径到(a)最接近的1.0mm, (b)传统尺寸类别（1小时¼0-6mm， 10小时¼6-25mm， 100小时¼25-76mm）， (c) 1厘米直径类别和(d) 2厘米类别。我们统计比较了采样生物量值与参考负荷的差异，发现(1)固定区域微样地技术比其他技术略微准确，(2)最准确的负荷估计是在测量燃料颗粒直径时，而不是估计到直径类别，(3)测量颗粒长度并不能提高估计精度。(4)光负载方法在高燃料负载下表现不佳；(5)准确估计燃料生物量需要对平面截距和固定区域微图方法进行密集采样。附加关键词：固定区域图，燃料库存，燃料装载，线相交，监控，光负荷，平面截距。
Designing woody fuel sampling methods that quickly, accurately and efficiently assess biomass at relevant spatial scales requires extensive knowledge of each sampling method's strengths, weaknesses and tradeoffs. In this study, we compared various modifications of three common sampling methods (planar intercept, fixed-area microplot and photoload)forestimatingfinewoodysurfacefuelcomponents(1-,10-,100-hfuels)usingartificialfuelbedsofknownfuel loadings as reference. Two modifications of the sampling methods were used: (1) measuring diameters only and both diameters and lengths and (2) measuring diameters to (a) the nearest 1.0mm, (b) traditional size classes (1h ¼0-6mm, 10h ¼6-25mm, 100h ¼25-76mm), (c) 1-cm diameter classes and (d) 2-cm classes. We statistically compared differences in sampled biomass values to the reference loading and found that (1) fixed-area microplot techniques were slightly more accurate than the others, (2) the most accurate loading estimates were when fuel particle diameters were measured and not estimated to a diameter class, (3) measuring particle lengths did not improve estimation accuracy, (4)photoloadmethodsperformedpoorlyunderhighfuelloadsand(5)accurateestimateoffuelbiomassrequiresintensive sampling for both planar intercept and fixed-area microplot methods. Additional keywords: fixed-area plot, fuel inventory, fuel loading, line intersect, monitoring, photoload, planar intercept.