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1. Automated Marker-Free Registration of Multisource Forest Point Clouds Using a Coarse-to-Global Adjustment Strategy

Author:
Zhang, Wuming; Shao, Jie; Jin, Shuangna; Luo, Lei; Ge, Junling; Peng, Xinyue; Zhou, Guoqing
Source:
Forests 2021 v.12 no.3
ISSN:
1999-4907
Subject:
canopy,   etc   ; automation; forests;     Show all 3 Subjects
Abstract:
... Terrestrial laser scanning (TLS) and unmanned aerial vehicles (UAVs) are two effective platforms for acquiring forest point clouds. TLS has an advantage in the acquisition of below-canopy information but does not include the data above the canopy. UAVs acquire data from the top viewpoint but are confined to the information above the canopy. To obtain complete forest point clouds and exploit the ap ...
DOI:
10.3390/f12030269

2. Effects of different interstock length on vegetative growth and flowering in peach cv. Pavie Catherine

Author:
Calderón, Facundo J.; Weibel, Antonio M.; Trentacoste, Eduardo R.
Source:
Scientia horticulturae 2021 v.285 pp. 110174
ISSN:
0304-4238
Subject:
canopy,   etc   ; orchards; peaches; rootstocks; vegetative growth; Argentina;     Show all 6 Subjects
Abstract:
... Peach production needs appropriate management strategies to control canopy size, to increase tree density and yield, and to facilitate orchard operations. We evaluated compatibility, vegetative growth and flowering in peach trees cv. Pavie Catherine grafted on seven interstocks, at two interstock lengths (5 and 35 cm). Citation, Damas GF 1869, Hiawatha, Krymsk® 1, Monpol, MrS 2/5 and Myran were us ...
DOI:
10.1016/j.scienta.2021.110174

3. Effect of a growing maize canopy on solid-set sprinkler irrigation: kinetic energy dissipation and water partitioning

Author:
Zapata, N.; Salvador, R.; Latorre, B.; Paniagua, P.; Medina, E. T.; Playán, E.
Source:
Irrigation science 2021 v.39 no.3 pp. 329-346
ISSN:
0342-7188
Subject:
canopy; canopy height,   etc   ; corn; field experimentation; irrigation water; kinetic energy; soil; sprinkler irrigation; stemflow;     Show all 9 Subjects
Abstract:
... The energy of sprinkler irrigation drops splashing on the soil surface or the crop canopy depends on their size and velocity. The kinetic energy of sprinkler irrigation drops is a major factor degrading the soil surface. The effect of a growing maize canopy on sprinkler drop energy dissipation and water partitioning was analyzed. A field experiment was performed on a solid-set sprinkler irrigated ...
DOI:
10.1007/s00271-020-00713-z

4. Mapping satellite-derived thermal parameters of canopy onset and assessing their temperature dependency for temperate forests in Korea

Author:
Cho, Nanghyun; Kang, Sinkyu; Lee, Bora; Agossou, Casimir; Lee, Jihye; Lim, Jong-Hwan; Kim, Eunsook
Source:
Ecological indicators 2021 v.125 pp. 107528
ISSN:
1470-160X
Subject:
canopy,   etc   ; acclimation; air temperature; altitude; latitude; phenology; satellites; Korean Peninsula;     Show all 8 Subjects
Abstract:
... Growing degree days (GDD) and chilling requirements (CR) of canopy phenological onset are popular thermal indicators showing forest adaptation to local temperature regimes. This study proposes a satellite-based approach for mapping the canopy-onset thermal traits and analyzing their controlling factors in temperate forests. GDD and CR from 2003 to 2017 were estimated with canopy onset dates and ai ...
DOI:
10.1016/j.ecolind.2021.107528

5. Urban street tree characteristics and benefits in city centre, Reykjavik, Iceland

Author:
Crosby, Michael K.; McConnell, T. Eric; Holderieath, Jason J.; Kjartansson, Bjarki Þ.; Traustason, Björn; Jónsson, Þorbergur H.; Snorrason, Arnór; Oddsdóttir, Edda S.
Source:
Trees, forests and people 2021 v.4 pp. 100066
ISSN:
2666-7193
Subject:
canopy,   etc   ; Populus trichocarpa; carbon; infrastructure; species diversity; street trees; Iceland;     Show all 7 Subjects
Abstract:
... Urban street trees are often overlooked as essential contributors to the total urban canopy. The city centre of Reykjavik, Iceland was surveyed using random plots throughout the central portion of Reykjavik to determine species composition, structure, potential conflicts with infrastructure, and environmental benefits. In this portion of Reykjavik, 11 tree species were observed, dominated by Popul ...
DOI:
10.1016/j.tfp.2021.100066

6. Error Analysis of LAI Measurements with LAI-2000 Due to Discrete View Angular Range Angles for Continuous Canopies

Author:
Geng, Jun; Yuan, Gang; Chen, J. M.; Lyu, Chunguang; Tu, Lili; Fan, Weiliang; Tian, Qingjiu; Wu, Zhaofu; Tao, Tingye; Yu, Min; Zhu, Yongchao; Huang, Jianwei; Xu, Kaijian; Li, Jinchao; Wang, Shaoteng
Source:
Remote Sensing 2021 v.13 no.7
ISSN:
2072-4292
Subject:
canopy gaps,   etc   ; equations; leaf area index; leaves; probability; weight;     Show all 6 Subjects
Abstract:
... As a widely used ground-based optical instrument, the LAI-2000 or LAI-2200 plant canopy analyzer (PCA) (Li-Cor, Inc., Lincoln, NE) is designed to measure the plant effective leaf area index (Lₑ) by measuring the canopy gap fraction at several limited or discrete view zenith angles (VZAs) (usually five VZAs: 7, 23, 38, 53, and 68°) based on Miller’s equation. Miller’s equation requires the probabil ...
DOI:
10.3390/rs13071405

7. Registration and Fusion of Close-Range Multimodal Wheat Images in Field Conditions

Author:
Dandrifosse, Sébastien; Carlier, Alexis; Dumont, Benjamin; Mercatoris, Benoît
Source:
Remote Sensing 2021 v.13 no.7
ISSN:
2072-4292
Subject:
canopy,   etc   ; cameras; image analysis; information; paper; phenotype; research; wheat;     Show all 8 Subjects
Abstract:
... Multimodal images fusion has the potential to enrich the information gathered by multi-sensor plant phenotyping platforms. Fusion of images from multiple sources is, however, hampered by the technical lock of image registration. The aim of this paper is to provide a solution to the registration and fusion of multimodal wheat images in field conditions and at close range. Eight registration methods ...
DOI:
10.3390/rs13071380

8. Hydrological effects of change in vegetation components across global catchments

Author:
Chen, Zefeng; Wang, Weiguang; Woods, Ross A.; Shao, Quanxi
Source:
Journal of hydrology 2021 v.595 pp. 125775
ISSN:
0022-1694
Subject:
canopy,   etc   ; botanical composition; climate; data collection; runoff; trees; water yield;     Show all 7 Subjects
Abstract:
... As an important component of the terrestrial system, vegetation plays a pivotal role in hydrological processes and water yield. Many studies have examined hydrological effects of changes in total vegetation coverage and density, whereas the impact of change in vegetation components (i.e., proportion of different vegetation types) is rarely considered and little known. Actually, even though the cha ...
DOI:
10.1016/j.jhydrol.2020.125775

9. Reducing shade avoidance can improve Arabidopsis canopy performance against competitors

Author:
Pantazopoulou, Chrysoula K.; Bongers, Franca J.; Pierik, Ronald
Source:
Plant, cell and environment 2021 v.44 no.4 pp. 1130-1141
ISSN:
0140-7791
Subject:
canopy,   etc   ; Arabidopsis; environment; leaf angle; leaves; mutants; plant communities;     Show all 7 Subjects
Abstract:
... Plants that grow in high density communities activate shade avoidance responses to consolidate light capture by individuals. Although this is an evolutionary successful strategy, it may not enhance performance of the community as a whole. Resources are invested in shade responses at the expense of other organs and light penetration through the canopy is increased, allowing invading competitors to ...
DOI:
10.1111/pce.13905

10. Reducing tree density affects interactions between trees and atmospheric Tillandsia species (Bromeliaceae)

Author:
Chaves, Cleber J. N.; Rossatto, Davi R.
Source:
Austral ecology 2021 v.46 no.2 pp. 218-227
ISSN:
1442-9985
Subject:
canopy,   etc   ; Tillandsia; biodiversity; epiphytes; habitat fragmentation; host preferences; trees;     Show all 7 Subjects
Abstract:
... Disruptions in species interactions derived from forest fragmentation are a major driver of biodiversity declines. Atmospheric bromeliads, a group of extreme epiphytes in the Tillandsia genus, often thrive in anthropogenic landscapes, spreading beyond their usual distribution. Here, we investigate how distinct tree densities affect the interactions between tree traits and patterns of atmospheric b ...
DOI:
10.1111/aec.12970

11. Pepper Plants Leaf Spectral Reflectance Changes as a Result of Root Rot Damage

Author:
Weksler, Shahar; Rozenstein, Offer; Haish, Nadav; Moshelion, Menachem; Wallach, Rony; Ben-Dor, Eyal
Source:
Remote Sensing 2021 v.13 no.5
ISSN:
2072-4292
Subject:
canopy,   etc   ; greenhouses; leaves; pepper; potassium; reflectance; root rot; salinity; vegetation;     Show all 9 Subjects
Abstract:
... Symptoms of root stress are hard to detect using non-invasive tools. This study reveals proof of concept for vegetation indices’ ability, usually used to sense canopy status, to detect root stress, and performance status. Pepper plants were grown under controlled greenhouse conditions under different potassium and salinity treatments. The plants’ spectral reflectance was measured on the last day o ...
DOI:
10.3390/rs13050980

12. Classification of Handheld Laser Scanning Tree Point Cloud Based on Different KNN Algorithms and Random Forest Algorithm

Author:
Lin, Wenshu; Fan, Weiwei; Liu, Haoran; Xu, Yongsheng; Wu, Jinzhuo
Source:
Forests 2021 v.12 no.3
ISSN:
1999-4907
Subject:
canopy,   etc   ; algorithms; data collection; forest inventory; geometry; leaves; models;     Show all 7 Subjects
Abstract:
... Handheld mobile laser scanning (HMLS) can quickly acquire point cloud data, and has the potential to conduct forest inventory at the plot scale. Considering the problems associated with HMLS data such as large discreteness and difficulty in classification, different classification models were compared in order to realize efficient separation of stem, branch and leaf points from HMLS data. First, t ...
DOI:
10.3390/f12030292

13. Vegetation structural complexity and biodiversity in the Great Smoky Mountains

Author:
Walter, Jonathan A.; Stovall, Atticus E. L.; Atkins, Jeff W.
Source:
Ecosphere 2021 v.12 no.3 pp. e03390
ISSN:
2150-8925
Subject:
canopy,   etc   ; biodiversity; forests; lidar; national parks; vascular plants;     Show all 6 Subjects
Abstract:
... Vegetation structural complexity and biodiversity tend to be positively correlated, but understanding of this relationship is limited in part by structural metrics tending to quantify only horizontal or vertical variation, and that do not reflect internal structure. We developed new metrics for quantifying internal vegetation structural complexity using terrestrial LiDAR scanning and applied them ...
DOI:
10.1002/ecs2.3390

14. Plant trait estimation and classification studies in plant phenotyping using machine vision – A review

Author:
Kolhar, Shrikrishna; Jagtap, Jayant
Source:
Information processing in agriculture 2021
ISSN:
2214-3173
Subject:
canopy,   etc   ; agriculture; chlorophyll; computer vision; data collection; information; phenotype; surveys;     Show all 8 Subjects
Abstract:
... Today there is a rapid development taking place in phenotyping of plants using non-destructive image based machine vision techniques. Machine vision based plant phenotyping ranges from single plant trait estimation to broad assessment of crop canopy for thousands of plants in the field. Plant phenotyping systems either use single imaging method or integrative approach signifying simultaneous use o ...
DOI:
10.1016/j.inpa.2021.02.006

15. Bird Diversity Unconsciously Increases People’s Satisfaction with Where They Live

Author:
Hepburn, Lauren; Smith, Adam C.; Zelenski, John; Fahrig, Lenore
Source:
Land 2021 v.10 no.2
ISSN:
2073-445X
Subject:
canopy,   etc   ; ; birds; income; land; people; social welfare; surveys; trees; Canada;     Show all 10 Subjects
Abstract:
... There is growing evidence that exposure to nature increases human well-being, including in urban areas. However, relatively few studies have linked subjective satisfaction to objective features of the environment. In this study we explore the links among objective environmental features (tree cover, water, and bird diversity) and subjective judgements of satisfaction. We surveyed residents of Otta ...
DOI:
10.3390/land10020153

16. Niche ecology in Floristic Quality Assessment: Are species with higher conservatism more specialized?

Author:
Zinnen, Jack; Spyreas, Greg; Zaya, David N.; Matthews, Jeffrey W.
Source:
Ecological indicators 2021 v.121 pp. 107078
ISSN:
1470-160X
Subject:
canopy,   etc   ; habitats; humans; information networks; introduced species; shrubs; Illinois;     Show all 7 Subjects
Abstract:
... Floristic Quality Assessment (FQA) metrics are used to assess the conservation value of natural areas based on the composition of their plant communities. FQA is based on coefficients of conservatism (C-values). C-values are regional, expert-assigned values, which range from 0 to 10 to reflect a taxon’s fidelity to high quality natural areas and its relative tolerance to modern human impacts. Appr ...
DOI:
10.1016/j.ecolind.2020.107078

17. Valuing ecosystem services of urban forests and open spaces: application of the SEEA framework in Australia

Author:
Tapsuwan, Sorada; Marcos‐Martinez, Raymundo; Schandl, Heinz; Yu, Zefan
Source:
The Australian journal of agricultural and resource economics 2021 v.65 no.1 pp. 37-65
ISSN:
1364-985X
Subject:
canopy,   etc   ; cost benefit analysis; decision making; ecosystems; infrastructure; irrigation; Australia;     Show all 7 Subjects
Abstract:
... Around two‐thirds of the global population will live in cities by 2050 requiring large urban infrastructure development. Decision‐makers and planners usually rely on standard economic accounting methods for urban planning and investments on infrastructure assets. However, standard methods fail to account for the ecosystem services benefits that living infrastructure (e.g. urban forests, open space ...
DOI:
10.1111/1467-8489.12416

18. Forest cover change analysis based on temporal gradients of the vertical structure and density

Author:
Berveglieri, Adilson; Imai, Nilton N.; M.G. Tommaselli, Antonio; Martins-Neto, Rorai P.; Takahashi Miyoshi, Gabriela; Honkavaara, Eija
Source:
Ecological indicators 2021 v.126 pp. 107597
ISSN:
1470-160X
Subject:
canopy height; forest canopy,   etc   ; data collection; forest management; photogrammetry; tree height; trees; tropical forests; variance; vegetation cover;     Show all 10 Subjects
Abstract:
... Canopy height is an important attribute that allows characterizing the forest vertical structure and analyze changes in vegetation cover over time. The objective of this study is to develop an approach for a spatio-temporal analysis of the tropical forest canopy using multi-temporal photogrammetric images. The datasets based on film and digital cameras are used to generate canopy height models and ...
DOI:
10.1016/j.ecolind.2021.107597

19. An improved approach to estimate above-ground volume and biomass of desert shrub communities based on UAV RGB images

Author:
Mao, Peng; Qin, Longjun; Hao, Mengyu; Zhao, Wenli; Luo, Jiechunyi; Qiu, Xu; Xu, Lijie; Xiong, Yujiu; Ran, Yili; Yan, Chunhua; Qiu, Guo Yu
Source:
Ecological indicators 2021 v.125 pp. 107494
ISSN:
1470-160X
Subject:
canopy; canopy height,   etc   ; Landsat; aboveground biomass; carbon sequestration; environmental health; landscapes; models; orthophotography; photogrammetry; shrubs; unmanned aerial vehicles; vegetation; China;     Show all 14 Subjects
Abstract:
... Above-ground biomass (AGB) is an essential indicator for assessing ecosystem health and carbon storage in desert shrub-related research. Above-ground volume (AGV) of vegetation is a crucial parameter to estimate the AGB. In unmanned aerial vehicle (UAV) remote sensing, the AGV and AGB are mainly estimated by vegetation feature metrics (for example, spectral indices, textural, and structural metric ...
DOI:
10.1016/j.ecolind.2021.107494

20. UAV Data as an Alternative to Field Sampling to Monitor Vineyards Using Machine Learning Based on UAV/Sentinel-2 Data Fusion

Author:
Zhou, Xixuan; Yang, Liao; Wang, Weisheng; Chen, Baili
Source:
Remote Sensing 2021 v.13 no.3
ISSN:
2072-4292
Subject:
canopy; canopy height,   etc   ; accuracy; algorithms; area; disease incidence; disease severity; pest control; prediction; regression analysis; satellites; vegetation; vegetation index;     Show all 13 Subjects
Abstract:
... Pests and diseases affect the yield and quality of grapes directly and engender noteworthy economic losses. Diagnosing “lesions” on vines as soon as possible and dynamically monitoring symptoms caused by pests and diseases at a larger scale are essential to pest control. This study has appraised the capabilities of high-resolution unmanned aerial vehicle (UAV) data as an alternative to manual fiel ...
DOI:
10.3390/rs13030457