In a nutshell: exploring single tree parameters and above-ground carbon sequestration potential of common walnut (Juglans regia L.) in agroforestry systems

Schindler, Zoe
Morhart, Christopher
Sheppard, Jonathan P.
Frey, Julian
Seifert, Thomas
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Springer Nature
Although agroforestry systems (AFS) provide numerous ecosystem services and are a recognized strategy for climate change mitigation and adaptation, knowledge on the woody component is lacking. Single tree data could improve planning, management and optimization of AFS. One tree species which is of great interest due to its valuable timber and non-timber products is walnut (Juglans regia L.). We used terrestrial laser scanning data to fit quantitative structure models (QSMs) for 65 walnut trees in AFS with diameter at breast height (DBH) ranging from 1 to 77 cm. Based on the QSMs, volumetric information as well as height and crown parameters were derived. By combining the volumetric data with bark and wood density followed by carbon and nutrient concentration, whole tree biomass, nutrient and carbon content were derived. To enable the application of our results, we modeled allometric relationships based on the DBH. The maximum crown projection area of a tree was more than 340 m2, the maximum leafless above-ground dry biomass was 7.4 t and the maximum amount of stored carbon was 3.6 t (in metric tons). A modelled AFS comprising 15 trees per hectare with a target DBH of 60 cm projects at the end of its 60-year rotation period an above-ground tree volume of more than 100 m3, about 60 t of dry biomass and roughly 30 t of sequestered carbon. By producing allometric functions, we provide much needed information for small-scale modelling of AFS.
© The Author(s) 2023. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit The Version of Scholarly Record of this Article is published in Agroforestry Systems, 2023, available online at: . Keywords: LiDAR; terrestrial laser scanning; QSM; tree volume; tree biomass; nutrient content.
Schindler, Z., Morhart, C., Sheppard, J.P. et al. In a nutshell: exploring single tree parameters and above-ground carbon sequestration potential of common walnut (Juglans regia L.) in agroforestry systems. Agroforest Syst (2023).