Crown and root biomass equations for the small trees of Pinus koraiensis under canopy

Abstract

Estimation of tree biomass is an essential part of studies on carbon sequestration and cycling in forest ecosystem. Small trees grow in the understory and allometric development is different from that of mature trees. However, less attention has been paid to biomass estimates of small trees, especially in mixed forest where tree competition is intensive. Tree allometric equations at both branch level and at whole tree level were, thus, developed and compared for the small trees of Korean pine (Pinus koraiensis) in a mixed stand in northeastern China. At branch level, the best model for live branch biomass was one which used a combination of branch diameter, branch length, whorl position and relative branch depth. For needle biomass, the best model did not significantly improve the estimate with more variables. At whole tree level, stem diameter at breast height (DBH) was a significant determinant of biomass for different components. Tree height did not significantly improve biomass estimation at all. Tree crown variables proved to be useful for estimating all biomass components except the fine roots. The variable measuring aboveground competition intensity was a significant negative determinant of biomass components except canopy biomass. Comparisons to published equations for the same species growing in Heilongjiang province in northeastern China and in central South Korea, were also presented. Both total aboveground biomass and belowground biomass in our study showed somewhat smaller values for a given diameter than the trees growing in other two places.

Tree Biomass Allocation and Its Model Additivity for Casuarina equisetifolia in a Tropical Forest of Hainan Island, China

“…Variation in the tree biomass and its allocation to components was commonly found in comparisons among individuals, ages, stands, regions, and species [ 49 – 51 ]. In the study, the proportion of trunk biomass to total tree biomass significantly increased at a level of 0.05 in the young forest to the mature forest and represented the greatest portion of the total biomass, which also could be found in other studies [ 52 – 53 ].…”

“…Wang et al . [ 76 ] demonstrated that crown width is an important determinant of leaf biomass for Korean pine ( Pinus koraiensis ). We also found that equations with the variable CR greatly improved root biomass estimates (Tables 2 and 4 ).…”

Widespread reduction in gross primary productivity caused by the compound heat and drought in Yangtze River Basin in 2022

“…Broadleaf forests, with their superior water regulation strategy (Lee et al 2021), stronger leaf stomatal regulation (van der Molen et al 2011) and characteristic water uptake depth of the root systems (Wang et al 2013), have been shown to efficiently access water and sustain photosynthesis during drought conditions. In contrast, coniferous forests, shrubs and grasslands exhibit lower resistance to this extreme event, primarily due to their limited biodiversity (Wang et al 2021, Renard et al 2023.…”

Насінна Продуктивність Сосни Кедрової Корейської (Pinus Koraiensis Sieb. Et Zucc.) В Межах Галицького Національного Природного Парку

“…Так, за даними Р. О. Яцика, 1000 шт. насінин сосни кедрової корейської мають масу 405,5 г (Jinsong Wang et al, 2002). Це, ймовірно, зумовлене отриманням даних з дерев різного віку та різними умовами зростання виду.…”

“…Результати аналізу наукових праць, висвітлених у світовій науково-метричній базі упродовж останніх років, свідчать про зростання в наукових колах інтересу до сосни кедрової корейської. Дослідження стосувались вивчення чутливості насаджень сосни кедрової корейської до змін клімату (Joo et al, 2013), оцінювання біомаси самосіву та підросту сосни у змішаних насадженнях (Jinsong Wang et al, 2002). Щодо господарського впливу людини, вивчено, як змінюються таксаційні показники штучних лісових насаджень після проведення в них рубань різної інтенсивності (Choi et al, 2014).…”