Effects of thinning on Larix olgensis plantation stem form based on TLS

GAO Xieyu, DONG Lihu, HAO Yuanshuo

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (6) : 85-94.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (6) : 85-94. DOI: 10.12302/j.issn.1000-2006.202211012

Effects of thinning on Larix olgensis plantation stem form based on TLS

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Abstract

【Objective】 The study explored the feasibility of terrestrial laser scanning (TLS) technology to evaluate the stem form, and analyzed the influence of different thinning measures on the stem form of Larix olgensis plantations. 【Method】 Five sample plots of L. olgensis plantations with different thinning measures in the Mengjiagang Forest Farm, Jiamusi City, Heilongjiang Province, were used to acquire TLS data. The preprocessed point clouds were first segmented into individual trees and classified into stem and non-stem points. Parameters that included diameter breast height, tree height, and diameter at different heights were further extracted. Finally, the indices of individual tree stem forms were calculated, theoretical timber was made, and the effects of different thinning measures on L. olgensis plantation stem form and stand economic value were analyzed. 【Result】 Compared to field-measured trees, the accuracy of individual tree characteristic parameters extracted based on TLS data was satisfactory. The error results of diameter breast height showed that ME was only -0.39 cm, MAPE was 2.86%, ME extracted from tree height was -0.26 m, and MAPE was 3.12%. All thinning measures improved the diameter breast height and volume growth of individual trees. There was no significant difference in tree height among the different thinning measures. The stem form indices of trees, such as and the volume distribution mode, differed in the different thinning methods, with the stem volume more distributed in the middle of the stem. Stem forms of different sizes did not significantly differ at the same site. The different thinning methods had no effect on the degree of tree root extension. Different thinning measures improved the economic value of stands in different degrees. 【Conclusion】 TLS exhibits high precision in extracting parameters of individual trees and can be used to obtain the dry shape characteristics of individual trees without destructive sampling. Different thinning measures have different effects on tree stem form and economic value of stands. The two high-intensity thinning measures can maximize the economic value of stands. These results provide a reference for forestry production practices in northeast China.

Key words

Larix olgensis / thinning measestrial / terrestrial laser scanning(TLS) / stem form

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GAO Xieyu , DONG Lihu , HAO Yuanshuo. Effects of thinning on Larix olgensis plantation stem form based on TLS[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2023, 47(6): 85-94 https://doi.org/10.12302/j.issn.1000-2006.202211012

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