Results 1 to 10 of about 7,795 (232)

Hegyi competition index decomposition to improve estimation accuracy of Larix olgensis crown radius

Ecological Indicators, 2022
The current individual tree competition indexes cannot provide information on the competitive pressure of trees in different directions. To quantitatively describe the magnitude of competitive pressure on trees in different directions, this study ...
Zhao Sun, Yifu Wang, Lei Pan, Yujun Sun
doaj   +2 more sources

Improving AGB estimations by integrating tree height and crown radius from multisource remote sensing. [PDF]

PLoS One
Precise estimation of forest above ground biomass (AGB) is essential for assessing its ecological functions and determining forest carbon stocks. It is difficult to directly obtain diameter at breast height (DBH) based on remote sensing imagery. Therefore, it is crucial to accurately estimate the AGB with features extracted directly from RS. This paper
Liu X, Dong L, Li S, Li Z, Wang Y, Mao Z, Deng L.   +6 more
europepmc   +3 more sources

Molecularly Engineered Aza-Crown Ether Functionalized Sodium Alginate Aerogels for Highly Selective and Sustainable Cu²⁺ Removal [PDF]

Gels
Developing sustainable and molecularly selective adsorbents for heavy-metal removal remains a critical challenge in water purification. Herein, we report a green molecular-engineering approach for fabricating aza-crown ether functionalized sodium ...
Teng Long, Ayoub El Idrissi, Lin Fu, Yufan Liu, Banlian Ruan, Minghong Ma, Zhongxun Li, Lingbin Lu   +7 more
doaj   +2 more sources

A Novel Approach to Characterizing Crown Vertical Profile Shapes Using Terrestrial Laser Scanning (TLS)

Remote Sensing, 2023
Crown vertical profiles (CVP) play an essential role in stand biomass and forest fire prediction. Traditionally, due to measurement difficulties, CVP models developed based on a small number of individual trees are not convincing.
Fan Wang, Yuman Sun, Weiwei Jia, Dandan Li, Xiaoyong Zhang, Yiren Tang, Haotian Guo   +6 more
doaj   +1 more source

A multi-feature predicting model of crown evolution involving material properties

AIP Advances, 2022
We propose a new model for the crown evolution after a single drop impacts on a thin film. In contrast with the existing models that mainly focus on the status of well-developed crown or the bottom radius evolution, multiple features are provided in our ...
Tianyu Ma, Yanchuang Cao, Jun Liu, Aiguo Xu, Jie Chen, Yingqi Jia, Dawei Chen   +6 more
doaj   +1 more source

Assessing the effects of forest gaps on beech (Fagus orientalis L.) trees traits in the logged temperate broad-leaf forest

Ecological Indicators, 2021
Silvicultural operations, including single-tree selection create gaps in forest canopies and these gaps impact on the forests structure. This study examines the influences of different harvest-created gap sizes on the oriental beech (Fagus orientalis L.)
Alireza Amolikondori, Kambiz Abrari Vajari, Mohammad Feizian   +2 more
doaj   +1 more source

TLidar-based crown shape indicates tree ring pattern in Norway spruce (Picea abies (L.) H. Karst) trees across competition gradients. A modeling and methodological approach

Ecological Indicators, 2023
Tree crowns and growth rings are physiologically and functionally connected through supporting and resource sharing. Management interventions may strongly influence tree growth by altering this linkage.
Shamim Ahmed, Hans Pretzsch
doaj   +1 more source

Predicting Crown Radius in Eastern White Pine (Pinusstrobus L.) Stands in New Hampshire [PDF]

Northern Journal of Applied Forestry, 2007
Abstract Using data from 449 trees on 69 growth-and-yield plots located in southern and central New Hampshire, we developed models of crown radius for stand-grown eastern white pine (Pinus strobus L.) in New Hampshire. In addition to dbh, we tested single-tree measurements sometimes collected in forest inventories (such as live crown ...
Gregory J. Jordan, Mark J. Ducey
openaire   +1 more source

Effect of strip shelterwood-cuts on the crown morphology plasticity of natural regenerated Pinus tabuliformis saplings in northeastern China [PDF]

PeerJ, 2020
The study analysed the effect of shelterwood-cut strips on the outermost crown profiles and crown characteristics of naturally regenerated Pinus tabuliformis saplings in northeastern China.
Huilin Gao, Jian Feng, You Yin, Wanjin Hu, Yang Qu, Mingguo Liu   +5 more
doaj   +2 more sources

Plant height–crown radius and canopy coverage–density relationships determine above-ground biomass–density relationship in stressful environments [PDF]

Biology Letters, 2009
Debate continues in theoretical ecology over whether and why the scaling exponent of biomass–density ( M – N ) relationship varies along environmental gradients. By developing a novel geometric model with assumptions of allometric growth at the individual level and open canopy at the stand ...
Xinfeng, Dai, Xin, Jia, Weiping, Zhang, Yanyuan, Bai, Junyan, Zhang, Yu, Wang, Genxuan, Wang   +6 more
openaire   +2 more sources