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首页> 外文期刊>Forstwissenschaftliches Centralblatt >Preliminary evaluation of an individual tree growth model for Norway spruce stands [German]
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Preliminary evaluation of an individual tree growth model for Norway spruce stands [German]

机译：挪威云杉林的单个树木生长模型的初步评估[德国]

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摘要

The applicability of the distance independent individual tree growth simulator PrognAus is tested in three Norway spruce experiments in a long term observation plot with target diameter thinning, a thinning experiment in Bavaria with 6 plots, and an Austrian experiment within the European Norway Spruce Thinning Experiment. Individual tree breast height diameters and heights after 20 years are generally sufficiently well-forecasted. The simulated basal area increments deviate from the observed values less than is to be expected from the statistics found in the parameterization procedure. The considerable underestimation of the height increment in the European Norway Spruce Thinning Experiment results from its extremely high site class (m.a.i. at age 100 > 22 m(3)ha(-1)a(-1)), which most probably was not represented in the parameterization data set. A small effect of underestimation of small basal area increments and overestimation of large increments is in line with other findings, indicating that the effects of dbh and competition are smaller in pure Norway spruce stands and larger in mixed species stands. The treatment effects are depicted in the correct order by the model, but nevertheless the simulated thinning effects are generally slightly overestimated.
机译：距离独立的个体树木生长模拟器PrognAus的适用性已在三个挪威云杉实验中进行了长期观测，目标直径进行了细化，在巴伐利亚进行了6个样地的细化试验，并在欧洲挪威云杉间伐试验中进行了奥地利试验。通常可以很好地预测各个树的乳房高度直径和20年后的高度。模拟的基础面积增量与观测值的偏差小于在参数化过程中发现的统计数据所期望的偏差。欧洲挪威云杉疏化实验中高度增量的明显低估是由于其极高的场地等级（100岁时的mai> 22 m（3）ha（-1）a（-1）），这很可能没有表现出来在参数化数据集中。低估小面积增加而高估高增加的小影响与其他发现一致，表明纯挪威云杉林分的dbh和竞争效应较小，而混合物种林分的影响较大。模型以正确的顺序描述了处理效果，但是，通常会稍微高估模拟的稀疏效果。

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