林分水平枯木评估的四种调查方法的比较

IF 1.8 3区 农林科学 Q2 FORESTRY Scandinavian Journal of Forest Research Pub Date : 2023-05-19 DOI:10.1080/02827581.2023.2216946
J. Siitonen, Hannes Pasanen, Matti Ylänne, L. Saaristo
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引用次数: 0

摘要

摘要许多林业从业者需要各种目的的枯木数量信息,通常是在单个林分的水平上。我们的目的是比较四种简单的枯木盘点方法,其中系统的圆形地块盘点是一种众所周知的方法,而重新定位地块盘点(也对倒下的树木使用普通的水平角重新定位仪)、直径类别计数和总盘点是新方法。七名测量人员在芬兰南部的四个林分中测试了这些方法。所有的方法都产生了相当准确的数量估计。平均百分比误差在总库存中最小(−5.7%),在直径类别计数中最大(−12.4%)。两种方法的精密度差异很大。以SD百分比表示的单个测量值之间的差异在总库存中为15.9%,在直径计数中为24.8%,在相关库存中为36.6%,在圆形地块库存中为43.0%。直径计数是迄今为止最快的方法。中继盘点和循环地块盘点所花费的时间大约是直径盘点的两倍,总盘点所花费时间是直径盘点时间的三倍。总之,如果目的是以合理的精度估计林分内的枯木总量,那么直径类别计数是一种具有成本效益的枯木评估方法。
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Comparison of four alternative survey methods in assessing dead wood at the stand level
ABSTRACT Many forestry practitioners need information on the amount of dead wood for various purposes, often at the level of individual stands. Our aim was to compare four simple dead-wood inventory methods of which systematic circular plot inventory is a well-known method, while relascope plot inventory (using the ordinary horizontal angle relascope also for downed trees), diameter class counting and total inventory are new methods. Seven surveyors tested the methods in four stands in southern Finland. All the methods produced rather accurate volume estimates. Mean percent error was the smallest (−5.7%) in total inventory and the largest (−12.4%) in diameter class counting. Precision differed significantly between the methods. Variation among individual measurements, expressed as percentage SD, was 15.9% in total inventory, 24.8% in diameter counting, 36.6% in relascope inventory and 43.0% in circular plot inventory. Diameter counting was by far the fastest method. Relascope inventory and circular plot inventory took about twice as much time, and total inventory over three times as much time as diameter counting. In conclusion, diameter class counting is a cost-effective dead-wood assessment method, if the purpose is to get an estimate of the total volume of dead wood within a forest stand with a reasonable precision.
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来源期刊
CiteScore
3.00
自引率
5.60%
发文量
26
审稿时长
3.3 months
期刊介绍: The Scandinavian Journal of Forest Research is a leading international research journal with a focus on forests and forestry in boreal and temperate regions worldwide.
期刊最新文献
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