PubAg

Main content area

You searched for: Subject "canopy" Remove constraint Subject: "canopy"
Start Over

Search

17,421  Search Results

« Previous | 1 - 20 of 17,421 |
Number of results to display per page

Search Results

1. The impact of ancient tree form on modern landscape preferences

Author:
Townsend, Joseph B.; Barton, Susan
Source:
Urban forestry & urban greening 2018 v.34 pp. 205-216
ISSN:
1618-8667
Subject:
canopy,   etc   ; emotions; landscapes; trees;     Show all 4 Subjects
Abstract:
... Empirical studies of the relationship between aspects of the landscape and human emotions have been fruitful over the last few decades. In fact, we are awash in data that describes a correlation between natural landscapes and positive human feelings. While this plethora of data has been useful to various disciplines, it has not lead to an explanatory theory as to why and how the landscape should h ...
DOI:
10.1016/j.ufug.2018.06.004

2. A novel method for testing automatic systems for controlling the spray boom height

Author:
Herbst, Andreas; Osteroth, Hans-Jürgen; Stendel, Hartje
Source:
Biosystems engineering 2018 v.174 pp. 115-125
ISSN:
1537-5110
Subject:
canopy,   etc   ; algorithms; sprayers; statistical analysis;     Show all 4 Subjects
Abstract:
... Automatic boom height control (BHC) systems for sprayers have become more common in recent years. The accuracy of the BHC is dependent on the quality of the height measurement as well as on the control algorithm that should be tailored to the dynamic behaviour of the spray boom and its suspension. There is a need for evaluating BHC performance but there is no objective test method available. A pro ...
DOI:
10.1016/j.biosystemseng.2018.06.003

3. Dispersion of a Passive Scalar Within and Above an Urban Street Network

Author:
Goulart, E.V.; Coceal, O.; Belcher, S.E.
Source:
Boundary-layer meteorology 2018 v.166 no.3 pp. 351-366
ISSN:
0006-8314
Subject:
canopy,   etc   ; advection; mathematical models; prediction;     Show all 4 Subjects
Abstract:
... The transport of a passive scalar from a continuous point-source release in an urban street network is studied using direct numerical simulation (DNS). Dispersion through the network is characterized by evaluating horizontal fluxes of scalar within and above the urban canopy and vertical exchange fluxes through the canopy top. The relative magnitude and balance of these fluxes are used to distingu ...
DOI:
10.1007/s10546-017-0315-5

4. Patch and landscape effects on forest-dependent dung beetles are masked by matrix-tolerant dung beetles in a mountaintop rainforest archipelago

Author:
da Silva, Pedro Giovâni; Nunes, Cássio Alencar; Ferreira, Luiz Fernando; Braga, Rodrigo Fagundes; Beiroz, Wallace; Perillo, Lucas Neves; Solar, Ricardo R.C.; de Siqueira Neves, Frederico
Source:
The Science of the total environment 2019 v.651 pp. 1321-1331
ISSN:
0048-9697
Subject:
canopy,   etc   ; dung beetles; habitat fragmentation; landscapes; mountains; multispectral imagery; rain forests; species diversity; summer; winter; Brazil;     Show all 11 Subjects
Abstract:
... Naturally fragmented landscapes provide suitable scenarios through which to investigate patch and landscape effects on biodiversity patterns in areas that are isolated from the disturbances usually associated with human-made fragments. We aimed to investigate the patch and landscape effects on the diversity of forest-dependent and matrix-tolerant dung beetles in a naturally fragmented landscape. W ...
DOI:
10.1016/j.scitotenv.2018.09.195

5. Discovery and defense define the social foraging strategy of Neotropical arboreal ants

Author:
Camarota, Flávio; Vasconcelos, Heraldo L.; Koch, Elmo B. A.; Powell, Scott
Source:
Behavioral ecology and sociobiology 2018 v.72 no.7 pp. 110
ISSN:
0340-5443
Subject:
canopy,   etc   ; Formicidae; body size; diet; foraging;     Show all 5 Subjects
Abstract:
... Interspecific trade-offs in foraging strategies can facilitate species coexistence in diverse communities with overlapping resource use, especially in taxa with complex social-foraging strategies. The discovery-dominance trade-off hypothesis is often invoked to help explain coexistence of ant species that use overlapping food resources, wherein colonies of some species are better at collectively d ...
DOI:
10.1007/s00265-018-2519-1

6. A Theoretically Consistent Framework for Modelling Lagrangian Particle Deposition in Plant Canopies

Author:
Bailey, BrianN.; Stoll, Rob; Pardyjak, EricR.
Source:
Boundary-layer meteorology 2018 v.167 no.3 pp. 509-520
ISSN:
0006-8314
Subject:
canopy,   etc   ; agrometeorology; geometry; mathematical theory; models; probability;     Show all 6 Subjects
Abstract:
... We present a theoretically consistent framework for modelling Lagrangian particle deposition in plant canopies. The primary focus is on describing the probability of particles encountering canopy elements (i.e., potential deposition), and provides a consistent means for including the effects of imperfect deposition through any appropriate sub-model for deposition efficiency. Some aspects of the fr ...
DOI:
10.1007/s10546-018-0333-y

7. Evaluation of a random displacement model for predicting longitudinal dispersion in flow through suspended canopies

Author:
Liu, Xiaoyu; Huai, Wenxin; Wang, Yufei; Yang, Zhonghua; Zhang, Jiao
Source:
Ecological engineering 2018 v.116 pp. 133-142
ISSN:
0925-8574
Subject:
canopy,   etc   ; diffusivity; models; prediction; solutes; vegetation;     Show all 6 Subjects
Abstract:
... Suspended vegetation can disturb flow, thereby affecting mass transportation. Although theoretical study of longitudinal dispersion in suspended vegetated flows may be complex, physical factors influencing longitudinal dispersion are well known. The key studying longitudinal dispersion is to obtain time-averaged longitudinal velocity distribution and lateral diffusion coefficient. A four-zone mode ...
DOI:
10.1016/j.ecoleng.2018.03.004

8. Tardigrades of the Canopy: Milnesium burgessi nov. sp. (Eutardigrada: Apochela: Milnesiidae) a New Species from Kansas, U.S.A.

Author:
Schlabach, Sadie; Donaldson, Emalee; Hobelman, Kaylyn; Miller, William R.; Lowman, Margret D.
Source:
Transactions of the Kansas Academy of Science 2018 v.121 no.1-2 pp. 39-48
ISSN:
0022-8443
Subject:
canopy,   etc   ; Tardigrada; claws; new species; Kansas;     Show all 5 Subjects
Abstract:
... Milnesium burgessi nov. sp. is a new species of tardigrade described from the canopy of eastern Kansas, USA. This unique tardigrade of class Eutardigrada, order Apochela and family Milnesiidae is characterized by its smooth cuticle, six peribuccal lamellae, long primary branch of the claws with accessory points, a claw configuration of [3-3]-[3-3] and a buccal tube that is significantly shorter th ...
DOI:
10.1660/062.121.0204

9. Ten-year performance of elms in the National Elm Trial

Author:
Griffin, J. J.; Jacobi, W.
Source:
Acta horticulturae 2018 no.1191 pp. 31-36
ISSN:
0567-7572
Subject:
canopy,   etc   ; Ulmus americana; cultivars; trees; Colorado; Iowa;     Show all 6 Subjects
Abstract:
... Ulmus americana (American elm) was an important urban tree in North America prior to the introduction of the Dutch elm disease (Ophiostoma ulmi and O. novo-ulmi) pathogen in 1930. Subsequently, urban and community forests were devastated by the loss of the large canopies. Disease tolerant elms (Ulmus spp.) of various species were later developed; however, consumer acceptance of these trees was slo ...
DOI:
10.17660/ActaHortic.2018.1191.5

10. Retrieving forest canopy clumping index using terrestrial laser scanning data

Author:
Ma, Lixia; Zheng, Guang; Wang, Xiaofei; Li, Shiming; Lin, Yi; Ju, Weimin
Source:
Remote sensing of environment 2018 v.210 pp. 452-472
ISSN:
0034-4257
Subject:
canopy gaps; forest canopy,   etc   ; algorithms; forests; leaf area index; leaves; optical equipment; photography; remote sensing;     Show all 9 Subjects
Abstract:
... Quantitatively characterizing the non-random spatial distributions of foliage elements including coniferous needles is critical to map the radiation regime and retrieve the biophysical parameters of a given forest canopy from three-dimensional (3-D) perspective. Different experimental setups bring various challenges to the process of retrieving forest canopy clumping index (CI) using terrestrial l ...
DOI:
10.1016/j.rse.2018.03.034

11. Land use and socio-economic determinants of urban forest structure and diversity

Author:
Fan, Chao; Johnston, Mark; Darling, Lindsay; Scott, Lydia; Liao, Felix Haifeng
Source:
Landscape and urban planning 2019 v.181 pp. 10-21
ISSN:
0169-2046
Subject:
canopy,   etc   ; data collection; education; home ownership; land use; planning; social factors; socioeconomic factors; species diversity; surveys; trees; urban forests; Illinois;     Show all 13 Subjects
Abstract:
... The spatial distribution of urban greenness within a city is largely influenced by land use configuration and social factors. This study builds upon previous research focusing on urban forest patterns in relation to land use and socio-economic determinants, while expanding the set of measures used to represent the forest structure. Instead of focusing on canopy cover alone, this study examines two ...
DOI:
10.1016/j.landurbplan.2018.09.012

12. Reliability analysis of seam joints in square plain parachute canopy fabric

Author:
Singh, Harabansh; Mukhopadhyay, Arunangshu; Chatterjee, Arbindo
Source:
The journal of the Textile Institute 2017 v.108 no.12 pp. 2057-2066
ISSN:
1754-2340
Subject:
canopy,   etc   ; fabrics; probability; tensile strength;     Show all 4 Subjects
Abstract:
... Performance of parachute continuously degrades due to opening shock and dynamic pressure acting on its various components after opening. During repeated use of parachute, degradation in tensile strength of canopy fabric plays an important role. Measurement of probability of successful operation of parachute in repeated use and under impact loading is possible through reliability analysis of its se ...
DOI:
10.1080/00405000.2017.1312674

13. Image Analysis in Plant Sciences: Publish Then Perish

Author:
Lobet, Guillaume
Source:
Trends in plant science 2017 v.22 no.7 pp. 559-566
ISSN:
1360-1385
Subject:
canopy,   etc   ; databases; image analysis; scientists;     Show all 4 Subjects
Abstract:
... Image analysis has become a powerful technique for most plant scientists. In recent years dozens of image analysis tools have been published in plant science journals. These tools cover the full spectrum of plant scales, from single cells to organs and canopies. However, the field of plant image analysis remains in its infancy. It still has to overcome important challenges, such as the lack of rob ...
DOI:
10.1016/j.tplants.2017.05.002

14. Estimation of forest leaf area index using terrestrial laser scanning data and path length distribution model in open-canopy forests

Author:
Chen, Yiming; Zhang, Wuming; Hu, Ronghai; Qi, Jianbo; Shao, Jie; Li, Dan; Wan, Peng; Qiao, Chen; Shen, Aojie; Yan, Guangjian
Source:
Agricultural and forest meteorology 2018 v.263 pp. 323-333
ISSN:
0168-1923
Subject:
forest canopy,   etc   ; algorithms; forests; leaf area index; models; photography;     Show all 6 Subjects
Abstract:
... Terrestrial Laser Scanning (TLS) is an active technology that can acquire the finest characteristics of canopy structure and plays an increasing role in estimating Leaf Area Index (LAI) in forest canopies. However, 3D information is not directly used in conventional TLS-based methods using the gap fraction theory. In addition, quantifying clumping effect within canopies is still a difficult task. ...
DOI:
10.1016/j.agrformet.2018.09.006

15. Sky-canopy border length, exposure and thresholding influence accuracy of hemispherical photography for complex plant canopies

Author:
Song, Guo-Zhang M.; Chao, Kuo-Jung; Doley, David; Yates, David
Source:
Botanical studies 2018 v.59 no.1 pp. 19
ISSN:
1999-3110
Subject:
canopy,   etc   ; image analysis; models; photographs; photography; understory; vegetation;     Show all 7 Subjects
Abstract:
... BACKGROUND: Hemispherical photography (HP) is a popular method to estimate canopy structure and understorey light environment, which analyses photographs acquired with wide view-angle lens (i.e. fisheye lens). To increase HP accuracy, the approaches of most previous studies were to increase the preciseness of exposure and thresholding of photographs, while ours quantified effects of canopy propert ...
DOI:
10.1186/s40529-018-0235-9

16. Correction to: Population dynamics in canopy gaps: nonlinear response to variable light regimes by an understory plant

Author:
Scanga, Sara E.
Source:
Plant ecology 2018 v.219 no.10 pp. 1269
ISSN:
1385-0237
Subject:
canopy gaps,   etc   ; light intensity; photoperiod; population dynamics; understory;     Show all 5 Subjects
Abstract:
... The original Electronic Supplementary Material incorrectly categorized subpopulation F as a Control rather than a Gap. The corrected version is provided in this Correction, with subpopulation F correctly included as one of the 11 gaps. ...
DOI:
10.1007/s11258-018-0867-6

17. Location Matters: Canopy Light Responses over Spatial Scales

Author:
Küpers, Jesse J.; van Gelderen, Kasper; Pierik, Ronald
Source:
Trends in plant science 2018 v.23 no.10 pp. 865-873
ISSN:
1360-1385
Subject:
canopy,   etc   ; cell growth; crops; engineering; photobiology; tissues; travel; vegetation;     Show all 8 Subjects
Abstract:
... Plants use light as a signal to determine neighbour proximity in dense vegetation. Far-red (FR) light reflected from neighbour plants elicits an array of growth responses throughout the plant. Recently, various light quality-induced signals have been discovered that travel between organs and tissue layers. These signals share upstream and downstream components, but can have opposing effects on cel ...
DOI:
10.1016/j.tplants.2018.06.011

18. Optimizing the Determination of Roughness Parameters for Model Urban Canopies

Author:
Huq, Pablo; Rahman, Auvi
Source:
Boundary-layer meteorology 2018 v.168 no.3 pp. 497-515
ISSN:
0006-8314
Subject:
canopy,   etc   ; data collection; friction; least squares; models; roughness;     Show all 6 Subjects
Abstract:
... We present an objective optimization procedure to determine the roughness parameters for very rough boundary-layer flow over model urban canopies. For neutral stratification the mean velocity profile above a model urban canopy is described by the logarithmic law together with the set of roughness parameters of displacement height d, roughness length [Formula: see text], and friction velocity [Form ...
DOI:
10.1007/s10546-018-0352-8

19. Effects of nitrogen, phosphorus, and potassium on SPAD-502 and atLEAF sensor readings of Salvia

Author:
Dunn, Bruce L.; Singh, Hardeep; Payton, Mark; Kincheloe, Sean
Source:
Journal of plant nutrition 2018 v.41 no.13 pp. 1674-1683
ISSN:
1532-4087
Subject:
canopy,   etc   ; Salvia; chlorophyll; fertilizers; leaves; markets; nitrogen; nutrients; phosphorus; potassium;     Show all 10 Subjects
Abstract:
... There are various optical sensors in the market for precision nitrogen (N) management, which estimate leaf N status from chlorophyll content of leaves. However, readings may also be affected by the amounts of other nutrients in the plant leaves like potassium (K) and phosphorus (P), as well as sampling location within a plant or leaf. SPAD-502 and atLEAF optical sensors were used on Salvia ‘Vista ...
DOI:
10.1080/01904167.2018.1458874

20. Estimation of the vertical leaf area profile of corn (Zea mays) plants using terrestrial laser scanning (TLS)

Author:
Su, Wei; Zhu, Dehai; Huang, Jianxi; Guo, Hao
Source:
Computers and electronics in agriculture 2018 v.150 pp. 5-13
ISSN:
0168-1699
Subject:
canopy,   etc   ; Zea mays; corn; irradiation; leaf area; leaves; lidar;     Show all 7 Subjects
Abstract:
... It remains challenging to estimate a crop’s leaf area profile accurately and automatically. Terrestrial laser scanning (TLS) offers a potential solution, since it has a small footprint and can be used to rapidly and accurately resolve the canopy’s 3D structure. To improve the accuracy of vertical leaf area profile estimation, we selected point clouds from three corn plants scanned in two TLS exper ...
DOI:
10.1016/j.compag.2018.03.037