Theoretical Strategies of Leaf Distribution

2020 ◽  
pp. 45-63
Keyword(s):  
Leaf Distribution

EFFECTS OF SHOOT AND LEAF DISTRIBUTION ON MICROCLIMATE AND FRUIT QUALITY IN 'FUJI' APPLE

2011 ◽  
pp. 1107-1114
Author(s):  
Q. Wei ◽  
X. Wang ◽  
Z. Sun ◽  
Q. Zhang ◽  
J. Lu ◽  
...  
Keyword(s):  
Fruit Quality ◽  
Fuji Apple ◽  
Leaf Distribution

Quantitative comparison of foliage display in two plots of corn

1974 ◽  
Vol 52 (12) ◽  
pp. 2465-2471 ◽  
Author(s):  
W. J. Kyle ◽  
J. A. Davies
Keyword(s):  
Canopy Structure ◽  
Theoretical Models ◽  
Quantitative Comparison ◽  
Distribution Functions ◽  
Radiation Interception ◽  
Spherical Distribution ◽  
Solar Altitude ◽  
Leaf Distribution

A quantitative comparison of foliage display in two plots of corn, seeded differently, revealed that the plants in both have essentially the same architecture despite differences in planting procedure. No significant azimuth preferences were found. Investigations of leaf inclinations indicated that leaf distribution functions are very close to the theoretical spherical distribution, with the result that radiation interception calculations are independent of solar altitude. This greatly facilitates the incorporation of canopy structure variables into theoretical models of canopy radiation interception.

A fractal dimension-based modelling approach for studying the effect of leaf distribution on LAI retrieval in forest canopies

2006 ◽  
Vol 197 (1-2) ◽  
pp. 179-195 ◽  
Author(s):  
I. Jonckheere ◽  
K. Nackaerts ◽  
B. Muys ◽  
J. van Aardt ◽  
P. Coppin
Keyword(s):  
Fractal Dimension ◽  
Forest Canopies ◽  
Leaf Distribution ◽  
Modelling Approach

scholarly journals APPLE TREE LIGHT INTERCEPTION, PHOTOSYNTHESIS, GROWTH, AND YIELD AS AFFECTED BY DIFFERENT ROOTSTOCKS

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1128c-1128
Author(s):  
Ido Schechter ◽  
D.C. Elfving ◽  
J.T.A. Proctor
Keyword(s):  
Apple Tree ◽  
Dry Weight ◽  
Light Interception ◽  
Growth And Yield ◽  
Seasonal Development ◽  
Canopy Development ◽  
Yield Efficiency ◽  
Leaf Distribution ◽  
Mature Apple ◽  
Leaf Dry Weight

Mature apple (Malus domestic a Borkh.) trees with “Starkspur Supreme Delicious” as the scion grafted on nine different rootstocks were studied in 1987 and 1988. Canopy seasonal development and its light interception were examined using fisheye (hemispherical) photographs Rootstock affected the amount of structural wood, the rate of canopy development and the final leaf area. However, rootstock did not affect the sigmoidal pattern of canopy development. Photosynthesis (Pn) was measured under field conditions. Shoot leaves, spur leaves on spurs without fruits (S-F), and spur leaves on spurs with fruit (S+F) from trees on M.26 EMLA and OAR 1 showed no differences in Pn rates. However, for both rootstock, shoot leaves had the highest Pn rate, S+F the lowest, and S-F leaves had intermediate values Growth and yield components were assessed by leaf separation into shoot and spur leaves while harvesting them. Rootstock strongly affected the canopy leaf distribution as well as leaf number, dry weight, area, number of spurs and yield PCLC. Yield efficiency was mainly dependent upon spur leaf dry weight. OAR 1 performed uniquely in this study

scholarly journals Sweet Potato Canopy Morphology: Leaf Distribution

1990 ◽  
Vol 115 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Zana C. Somda ◽  
Stanley J. Kays
Keyword(s):  
Leaf Area ◽  
Sweet Potato ◽  
Ipomoea Batatas ◽  
Plant Density ◽  
Leaf Size ◽  
Progressive Increase ◽  
Leaf Number ◽  
Petiole Length ◽  
Plant Densities ◽  
Leaf Distribution

Changes in leaf distribution of the sweet potato [Ipomoea batatas (L.) Lam.] cultivar Jewel were assessed bi-weekly for 18 weeks at three plant densities (15, 30, and 45 cm × 96-cm spacing). The distribution of leaves on the branches and the timing at which leaf number stabilized were affected by the plant density. Plant density resulted in significant differences in the number of leaves and percentage of missing leaves during the growing season. Leaf number and total leaf area varied substantially in response to plant density, but individual lamina and petiole lengths and leaf area did not vary. Average petiole and leaf lengths and leaf size increased during the season, with the maximum length and area dependent on the type of branch on which the leaf was formed. Average petiole length per branch and the susceptibility to leaf loss increased with descending branch hierarchy (secondary branch < primary branch < main stem). Leaf losses after the 4th week tended to parallel a progressive increase in petiole length of new leaves, suggesting shading as a primary cause of leaf shedding and the loss of the oldest leaves first.

On the Shape of the Leaves

2013 ◽  
Vol 798-799 ◽  
pp. 1053-1060
Author(s):  
Shu Jiang Ding
Keyword(s):  
Neural Network ◽  
Fourier Transform ◽  
Experimental Test ◽  
Classification Accuracy ◽  
Probabilistic Neural Network ◽  
External Environment ◽  
Shape Features ◽  
Leaf Vein ◽  
Color Features ◽  
Leaf Distribution

In this paper, we study the shape of the leaves. More specifically, we show that leaf shapes are affected by genes and external environment in different species; and affected by leaf vein and leaf distribution In the same species. Based on shape features, color features and vein features, aProbabilistic Neural Network (PNN) Modelis established by using Polar Fourier Transform. Finally, our experimental test shows that the total classification accuracy is 85.7%.

scholarly journals Seasonal Variation of the Canopy Structure Parameters and Its Correlation with Yield-Related Traits in Sugarcane

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Jun Luo ◽  
Youxiong Que ◽  
Hua Zhang ◽  
Liping Xu
Keyword(s):  
Transmission Coefficient ◽  
Canopy Structure ◽  
Diffuse Radiation ◽  
Growth Stages ◽  
Beam Radiation ◽  
Area Index ◽  
Sugarcane Varieties ◽  
Sugarcane Yield ◽  
Leaf Distribution ◽  
Different Growth Stages

Population structure determines sugarcane yield, of which canopy structure is a key component. To fully understand the relations between sugarcane yield and parameters of the canopy structure, 17 sugarcane varieties were investigated at five growth stages. The results indicated that there were significant differences between characterized parameters among sugarcane populations at different growth stages. During sugarcane growth after planting, leaf area index (LAI) and leaf distribution (LD) increased, while transmission coefficient for diffuse radiation (TD), mean foliage inclination angle (MFIA), transmission coefficient for solar beam radiation penetration (TR), and extinction coefficient (K) decreased. Significant negative correlations were found between sugarcane yield and MFIA, TD, TR, andKat the early elongation stage, while a significant positive correlation between sugarcane yield and LD was found at the same stage. A regression for sugarcane yield, with relative error of yield fitting less than 10%, was successfully established: sugarcane yield = 2380.12 + 46.25 × LD − 491.82 × LAI + 1.36 × MFIA + 614.91 × TD − 1908.05 × TR − 182.53 ×  K+ 1281.75 × LD − 1.35 × MFIA + 831.2 × TR − 407.8 ×  K+ 8.21 × MFIA − 834.50 × TD − 1695.49 ×  K  (R2=0.94**).

Competition between Chondrilla juncea and Trifolium subterraneum: the influence of canopy areas and heights

1987 ◽  
Vol 38 (2) ◽  
pp. 329 ◽  
Author(s):  
AO Nicholls ◽  
JD Williams ◽  
RM Moore
Keyword(s):  
Trifolium Subterraneum ◽  
Mixed Stands ◽  
Relative Growth ◽  
Competition Analysis ◽  
Relative Growth Rates ◽  
Nitrogen Levels ◽  
Net Assimilation ◽  
Leaf Distribution ◽  
Reproductive Phases ◽  
Chondrilla Juncea

Growth in the field of Chondrilla juncea and Trijolium subterraneum at different nitrogen levels was compared during late vegetative and early reproductive phases in monocultures and mixed stands. Observed differences between the species in terms of relative growth rates and net assimilation rates in monocultures were not reflected in the performance of the species in competitive mixtures. A major factor contributing to this anomaly was the different leaf distribution of the two species in mixtures.The annual T. subterraneum produced a larger area of leaf at a higher level in the canopy than did the perennial C. juncea.The crowding coefficient of C. juncea with respect to T. subterraneum was significantly less than 1, indicating that T. subterraneum was more competitive than C. juncea.Applications of nitrogen at a late stage of growth did not change the competitive ability of the species.Some limitations of the experimental procedure and of the de Wit competition analysis are discussed.

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