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Species-specific and generalized biomass models for estimating carbon stocks of young reforestations
Biomass & Bioenergy ( IF 6 ) Pub Date : 2022-05-02 , DOI: 10.1016/j.biombioe.2022.106453
María Menéndez-Miguélez , Rafael Calama , Miren Del Río , Guillermo Madrigal , Eduardo López-Senespleda , Marta Pardos , Ricardo Ruiz-Peinado

Biomass models are key to the correct quantification of aboveground biomass and carbon stocks. Most of the current available sets of biomass models were developed for adult trees although very few have been employed to accurately estimate biomass during the first years of reforestations, despite the increasing number of reforestations over recent years.

In this study, species-specific and generalized models for aboveground biomass of single trees have been developed for the main 14 species used in reforestations in Spain. A comparison with the existing biomass models at individual tree level for larger trees of these species was also conducted to confirm the hypothesis that specific models are required for the first years of the reforestation.

A new set of biomass models was fitted simultaneously per species, based on three different independent variables – root-collar-diameter, total height and crown projection area- and their combinations. The fitted models provide more accurate and unbiased predictions of aboveground biomass in the first years after reforestation when compared with previously existing models for adult trees. The generalized models can be applied to reforestations when the main species is unknown or for mixed plantations where species are not individualized.

The set of models provided can be used in a wide variety of surveys and monitoring conditions depending on the available data, from classical field inventories to more novel approaches such as airborne LiDAR data or aerial photographs.



中文翻译:

用于估算年轻再造林碳储量的特定物种和广义生物量模型

生物质模型是正确量化地上生物量和碳储量的关键。尽管近年来重新造林的数量不断增加,但目前大多数可用的生物量模型都是为成年树木开发的,尽管很少有人被用来准确估计重新造林最初几年的生物量。

在这项研究中,针对西班牙重新造林中使用的 14 个主要物种,开发了单一树木地上生物量的特定物种和广义模型。还对这些物种的较大树木在单个树木水平上与现有生物量模型进行了比较,以确认重新造林的第一年需要特定模型的假设。

基于三个不同的自变量——根领直径、总高度和树冠投影面积——及其组合,每个物种同时拟合了一组新的生物量模型。与先前存在的成年树模型相比,拟合模型在重新造林后的第一年提供了更准确和无偏的地上生物量预测。广义模型可应用于主要物种未知的重新造林或物种未个体化的混合种植园。

所提供的模型集可用于各种调查和监测条件,具体取决于可用数据,从经典的现场清单到更新颖的方法,如机载 LiDAR 数据或航拍照片。

更新日期:2022-05-03
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