The Use of Canopy Models to Analyze Light Competition Among Plants

2016 ◽  
pp. 379-398 ◽  
Author(s):  
Niels P. R. Anten ◽  
Lammert Bastiaans
Keyword(s):  
Light Competition

scholarly journals Light competition and phenological adaptation of annual plants to a changing climate

2021 ◽  
pp. 100007
Author(s):  
Willian T.A.F. Silva ◽  
Mats Hansson ◽  
Jacob Johansson
Keyword(s):  
Annual Plants ◽  
Light Competition ◽  
Changing Climate

scholarly journals Light competition explains diversity decline better than niche dimensionality

2017 ◽  
Vol 31 (9) ◽  
pp. 1834-1838 ◽  
Author(s):  
Niv DeMalach ◽  
Ronen Kadmon
Keyword(s):  
Light Competition ◽  
Better Than

scholarly journals Light dynamics and free-to-grow standards in aspen-dominated mixedwood forests

2002 ◽  
Vol 78 (1) ◽  
pp. 137-145 ◽  
Author(s):  
Victor J Lieffers ◽  
Bradley D Pinno ◽  
Kenneth J Stadt
Keyword(s):  
Leaf Area Index ◽  
Key Words ◽  
Leaf Area ◽  
Light Transmission ◽  
Stand Density ◽  
Canopy Gaps ◽  
Light Competition ◽  
Area Index ◽  
Mixedwood Forests ◽  
Key Words Competition

This study examines light competition between aspen and spruce during the sequence of aspen development. Leaf area index and light transmission were measured or estimated for aspen stands from 2 to 125 years old. Light transmission was lowest at 15-25 years, and in some stands, transmission was less than 5% of above-canopy light. Hypothetical aspen stands with various stem configurations and heights were developed, and positions were identified that would meet or fail Alberta free-to-grow (FTG) standards. Light transmission was estimated at each position with the MIXLIGHT forest light simulator. Positions in canopy gaps or at the northern sides of canopy gaps had higher light. In general, however, there was little difference in available light between positions that met or failed FTG criteria. Stand density and size of aspen trees appears to be a better index to predict light transmission and spruce success in juvenile aspen stands than current FTG criteria. Key words: competition, free to grow, hardwood, spruce, light

scholarly journals Approach for Image-Based Semantic Segmentation of Canopy Cover in Pea–Oat Intercropping

Agriculture ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 354
Author(s):  
Sebastian Munz ◽  
David Reiser
Keyword(s):  
Cropping Systems ◽  
Canopy Cover ◽  
Semantic Segmentation ◽  
Weed Suppression ◽  
Growth Stages ◽  
Light Competition ◽  
Management Options ◽  
Sole Cropping ◽  
Single Dataset ◽  
High Yields

Intercropping systems of cereals and legumes have the potential to produce high yields in a more sustainable way compared to sole cropping systems. Their agronomic optimization remains a challenging task given the numerous management options and the complexity of interactions between the crops. Efficient methods for analyzing the influence of different management options are needed. The canopy cover of each crop in the intercropping system is a good determinant for light competition, thus influencing crop growth and weed suppression. Therefore, this study evaluated the feasibility to estimate canopy cover within an intercropping system of pea and oat based on semantic segmentation using a convolutional neural network. The network was trained with images from three datasets during early growth stages comprising canopy covers between 4% and 52%. Only images of sole crops were used for training and then applied to images of the intercropping system. The results showed that the networks trained on a single growth stage performed best for their corresponding dataset. Combining the data from all three growth stages increased the robustness of the overall detection, but decreased the accuracy of some of the single dataset result. The accuracy of the estimated canopy cover of intercropped species was similar to sole crops and satisfying to analyze light competition. Further research is needed to address different growth stages of plants to decrease the effort for retraining the networks.

Nutritive value and morphological characteristics of Mombaça grass managed with different rotational grazing strategies

2019 ◽  
Vol 157 (7-8) ◽  
pp. 592-598
Author(s):  
S. C. Da Silva ◽  
A. A. O. Bueno ◽  
R. A. Carnevalli ◽  
G. P. Silva ◽  
M. B. Chiavegato
Keyword(s):  
Nutritive Value ◽  
Morphological Characteristics ◽  
Statistical Design ◽  
Panicum Maximum ◽  
Forage Production ◽  
Light Competition ◽  
Area Index ◽  
Light Utilization ◽  
Morphological Composition ◽  
Acid Detergent Fibre

AbstractLight competition increases and plants’ growth pattern change to optimize light utilization when the leaf area index increases. It has been previously shown that using 95% canopy light interception (LI) as a grazing frequency criterion resulted in a greater proportion of leaves and a lower proportion of stem. The objective of the study was to characterize the forage production, morphological composition and nutritive value of Panicum maximum cv Mombaça. The experiment was carried out during summer, autumn–winter and spring. Treatments corresponded to combinations of two pre-grazing conditions (95% and maximum LI at pre-grazing; LI95% and LIMax, respectively) and two post-grazing heights (PGHs; 30 and 50 cm). The statistical design was a randomized complete block, with a 2 × 2 factorial arrangement. Swards managed with LI95% had greater proportions of leaves and lower proportions of stems compared to LIMax. Leaf proportion was lower during autumn–winter compared to summer and spring. The LI95% had greater crude protein (CP) and digestibility (IVOMD), and lower acid detergent fibre (ADF) concentrations than LIMax. The 50 cm PGH pastures had greater CP content and IVOMD, and lower ADF content than 30 cm PGH pastures. Lower IVOMD was observed during autumn–winter than summer and spring. The variability observed on morphological characteristics was primarily associated with seasonality, whilst the nutritive value was primarily affected by grazing management. The pre-grazing target of LI95% combined with 50 cm PGH was the combination that resulted in an increased proportion of leaves, decreased stems in basal stratum and the greatest nutritive value of the produced forage.

scholarly journals The role of biomass allocation between lamina and petioles in a game of light competition in a dense stand of an annual plant

2018 ◽  
Vol 121 (5) ◽  
pp. 1055-1064 ◽  
Author(s):  
Kenta Yoshinaka ◽  
Hisae Nagashima ◽  
Yusuke Yanagita ◽  
Kouki Hikosaka
Keyword(s):  
Biomass Allocation ◽  
Annual Plant ◽  
Light Competition ◽  
Dense Stand

Light competition within dense plant stands and their subsequent growth under illumination with different red:far-red ratios

2016 ◽  
Vol 213 ◽  
pp. 49-54 ◽  
Author(s):  
Toshio Shibuya ◽  
Saki Kishigami ◽  
Shuji Takahashi ◽  
Ryosuke Endo ◽  
Yoshiaki Kitaya
Keyword(s):  
Subsequent Growth ◽  
Light Competition
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