Exploring the influence of large trees on temperate forest spatial structure from the angle of mingling

Liu, Na; Wang, Dawei; Guo, Qiqiang

doi:10.1016/j.foreco.2021.119220

Cited by 12 publications

(3 citation statements)

References 51 publications

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“…Compared to traditional forestry, neighborhood competition encompassed information regarding tree positions and spatial relationships among adjacent trees. These pieces of information directly or indirectly determined the intensity of competition among neighboring trees, exerting a significant impact on the natural regeneration process [62,63]. Our research revealed a significant decrease in the number of herb seedlings (NHS), shrub saplings (NSS), and exogenous natural regenerations (NexR) with increasing M (Figures 3 and 5b).…”

Section: Direct and Indirect Effects Of Neighborhood Competition Fact...mentioning

confidence: 70%

Neighborhood Competition and Understory-Associated Vegetation Are Important Factors Influencing the Natural Regeneration of Subtropical Mountain Forests

Wang,

Qin,

Fang

et al. 2024

Forests

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Natural regeneration is deemed essential for maintaining biodiversity and ecosystem stability. Previous studies, however, have primarily concentrated on regions exhibiting limited environmental and climatic variability, overlooking the classification of natural regeneration based on age and source. Research conducted at the mesoscale, characterized by increased environmental variability and the incorporation of neighborhood competition and understory-associated vegetation, enhances our comprehension of the multifaceted influences on natural regeneration. To comprehend this issue, this study implemented 60 plots, each measuring 20 m × 20 m, across five distinct areas of Chongqing, China. Twenty explanatory variables were chosen from five diverse categories: understory vegetation, neighborhood competition, stand structure, climatic factors, and environmental factors. And the naturally regenerated species were classified into seedlings and saplings, as well as endogenous and exogenous species, based on their age and origin. We examined the response of the different categories of natural regeneration to various factors and constructed a structural equation model (SEM) for significant factors to investigate their direct and indirect effects on natural regeneration. A total of 61 regenerated tree species belonging to 29 families and 42 genera were found in the study area, and the naturally regenerating species with high importance values were Quercus fabri, Robinia pseudoacacia, Alangium chinense, Cunninghamia lanceolata, and Ligustrum lucidum. It was found that neighborhood competition and understory-associated vegetation explained the largest proportion (more than 50%) of the variation in the different categories of natural regeneration, and forests with clumped distribution (W), a high mingling index (M) and strong competition (H) had a reduced natural regeneration capacity. Understory-associated herbs significantly reduced natural regeneration and the crowdedness index (C) significantly inhibited the understory-associated herbs, thus indirectly promoting natural regeneration. The shrub cover is significantly and positively correlated with the number of naturally regenerated plants and can be used as an indicator of a forest community’s regeneration potential. Understanding the differences in the importance of various factors at the mesoscale, as well as their direct and indirect impacts, can help us further comprehend the mechanisms of natural regeneration and provide a foundation for the sustainable development of forests.

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Section: Direct and Indirect Effects Of Neighborhood Competition Fact...mentioning

confidence: 70%

Neighborhood Competition and Understory-Associated Vegetation Are Important Factors Influencing the Natural Regeneration of Subtropical Mountain Forests

Wang,

Qin,

Fang

et al. 2024

Forests

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“…The influence of logging on spatial structure characteristic indexes Compared to the non-spatial structure, the spatial structure of the stand contains the positional information of trees and the spatial (horizontal and vertical direction) relationships among neighboring trees. This information directly or indirectly determines the competition intensity among neighboring trees and the effects of the growth-related environmental factors, which have a great impact on the growth and development of remaining trees, as well as the growth and biomass allocation during natural regeneration (Liu N. et al, 2021;Dong et al, 2022). The mingling index (M) and uniform angle index (W) are the main horizontal spatial structure indexes that help maintain the diversity benefits and ecological functions (Dong et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the light requirements of P. massoniana at the seedling stage could potentially be better met in LCT . Simultaneously, the competition index ( CI ) and neighborhood comparison ( U ) were used to determine the competitive situation of the neighboring trees (Hui et al, 2018 ; Liu N. et al, 2021 ; Dong et al, 2022 ). Light, nutrients, and spatial extent are among the most important environmental factors for the growth of trees at the stage of the near-mature forest (Lai et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Stand structure adjustment influences the biomass allocation in naturally generated Pinus massoniana seedlings through environmental factors

Wang²,

Wang³

et al. 2022

Front. Plant Sci.

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The natural regeneration of seedlings is a key factor for forest succession. Nevertheless, studies explaining the mechanism of growth and biomass allocation in regenerated seedlings after disturbance are lacking. Therefore, we measured the growth, biomass accumulation, and biomass allocation in current-age seedlings of Pinus massoniana after selective logging (logging of competitive trees, LCT; logging of inferior trees, LIT; and unlogged control, CK), and established structural equation models (SEMs) among the spatial structure characteristic indexes of the stand, environmental factors, and biomass allocation in different organs. As compared to the CK, the mingling index (M), uniform angle index (W), opening degree (O), soil organic carbon (SOC), available nitrogen (SAN), available phosphorus (SAP), available potassium (SAK), and bulk density (SBD) significantly increased (p < 0.05), while the competition index (CI) and neighborhood comparison (U) significantly decreased after logging (p < 0.05). After the LCT, seedling branch biomass improved, with an increase in the ground-diameter, crown-root ratio, and seedling quality index. More biomass was allocated to foliage and roots by an increase in the height and height-diameter ratio under the LIT. In the CK, increasing stem biomass helped the seedlings absorb and utilize more light. The Pearson correlation coefficient showed that biomass allocation to organs was independent, and seedlings adopted the strategies of heterogeneous adaptation and growth, thereby resulting in the separation of the allocation patterns among the organs. As per the redundancy analysis (RDA), CI was the main factor in biomass allocation. Environmental factors had direct effects on biomass allocation to organs, while the stand spatial structure characteristic indexes had indirect effects on biomass allocation based on SEMs. In summary, the LCT had significant, albeit indirect, effects on SOC, SAN, and SBD by reducing the CI for the regeneration and growth of seedlings in the stand, which was of great significance to the sustainable development of the forest stand of P. massoniana.

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Assessment of the stand structure of protective forest monitoring based on statistical models in Irano-Turanian phytogeographical regions of Iran

Zandebasiri,

Sagheb‑Talebi,

Jahanbazi Goujani

et al. 2023

Environ Monit Assess

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Exploring the influence of large trees on temperate forest spatial structure from the angle of mingling

Cited by 12 publications

References 51 publications

Neighborhood Competition and Understory-Associated Vegetation Are Important Factors Influencing the Natural Regeneration of Subtropical Mountain Forests

Neighborhood Competition and Understory-Associated Vegetation Are Important Factors Influencing the Natural Regeneration of Subtropical Mountain Forests

Stand structure adjustment influences the biomass allocation in naturally generated Pinus massoniana seedlings through environmental factors

Assessment of the stand structure of protective forest monitoring based on statistical models in Irano-Turanian phytogeographical regions of Iran

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