Estimation of fresh sprout biomass based on tree variables of pollarding Turkey oak (Quercus cerris L.)

Sağlam, Serhun; Özdemir, Emrah; Özkan, Ulaş Yunus; Demirel, Tufan; Makineci, Ender

doi:10.1007/s10661-021-08882-w

Cited by 1 publication

(2 citation statements)

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“…Ref. [29] showed that the DBHs and heights of pollarded trees of the species Quercus cerris L. were linearly correlated (correlation coefficient = 0.464). Furthermore, Niemczyk and Bruchwald (2017) presented relationships for estimating the DBH of Populus spp.…”

Section: Discussionmentioning

confidence: 99%

“…Each Shanegala is pollarded in a three or four year pollarding cycle [4,28], which annually occurs from mid-September to early October (pre-fall). However, pollarding is not carried out in this way everywhere and is carried out irregularly [29]. During pollarding, forest dwellers cut leafy branches (Kurdish: Bakhe) of oak trees, mostly Quercus libani Olivier and Q. infectoria Olivier., and store them on large trees (Kurdish: Dargala), on the ground, or on rock fragments in a cone-shaped formation known as a Gala or a Loya Gala (in Kurdish).…”

Section: Introductionmentioning

confidence: 99%

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Combination of UAV Photogrammetry and Field Inventories Enables Description of Height–Diameter Relationship within Semi-Arid Silvopastoral Systems

Fakhri,

Latifi,

Mohammadi Samani

et al. 2023

Remote Sensing

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Pollarding oak trees is a traditional silvopastoral technique practiced across wide areas of the northern Zagros mountains, a unique and vast semi-arid forest area with a strong cultural and ecological significance. So far, the effects of pollarding on tree structure in terms of DBH (diameter at breast height)~H (height) relationships within the typical pollarding cycle, which often lasts 4 years, has not been scientifically described. Here, we combine field inventories of DBH with H obtained from photogrammetric UAV flights for the first time to assess DBH~H relationships within this system. We conducted the research at six pollarded forest sites throughout the Northern Zagros. The sampling encompassed all three main species of coppice oak trees. In the case of multi-stem trees, we used the maximum DBH of each tree that formed a unique crown. A linear relationship between UAV and extracted H and the maximum DBH of pollarded trees explained a notable part of the variation in maximum DBH (R2 = 0.56), and more complex and well-known nonlinear allometries were also evaluated, for which the accuracies were in the same range as the linear model. This relationship proved to be stable across oak species, and the pollarding stage had a notable effect on the DBH~H relationship. This finding is relevant for future attempts to inventory biomass using remote sensing approaches across larger areas in northern Zagros, as well as for general DBH estimations within stands dominated by pollarded, multi-stem coppice structures.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%