Estimation of leaf weight of standing trees of Eucalyptusregnans

1990 ◽  
Vol 20 (11) ◽  
pp. 1732-1738 ◽  
Author(s):  
P. W. West ◽  
K. F. Wells
Keyword(s):  
Model Theory ◽  
Dry Weight ◽  
Tree Age ◽  
True Value ◽  
Pipe Model ◽  
Leaf Weight ◽  
Total Leaf ◽  
Standing Trees ◽  
Leaf Dry Weight ◽  
Pipe Model Theory

A model was developed to estimate total leaf dry weight of individual standing trees of Eucalyptusregnans F. Muell. in even-aged, monoculture stands aged 8–20 years. Tree biomass data were collected for a sample of 42 trees from four plots at three sites in Victoria and Tasmania. One plot had been heavily thinned 10 years prior to sampling. The model was based on the pipe model theory, L(x) = as(x)p(x), where L(x) is leaf dry weight above some height (x), s(x) and p(x) are, respectively, stem sapwood area and permeability at x, and a is a parameter. Permeability is known to vary with site and tree conditions, and an empirical model was developed that replaced ap(x) in the pipe model theory with a function in terms of tree age, diameter at breast height over bark, and distance along the stem from the tip of the tree. The resulting model to predict leaf weight appeared to be unbiased across sites, among trees within sites, and with respect to thinning treatment. It was found that given a prediction from the model of total leaf dry weight of one tree, it could be assumed with 95% confidence that the true value of leaf weight fell within an interval bounded by values of −60 to +76% of the estimate. When the model was used to predict stand leaf weight by summing estimates from many individual trees, the interval was bounded by minimum values of −3 to +19% of the stand estimate. These errors of estimate were probably conservative. It appeared that errors of similar magnitude may apply to other published models of this type.

Wood structure and production within the trunk and branches of Piceasitchensis in relation to canopy formation

1979 ◽  
Vol 9 (3) ◽  
pp. 406-427 ◽  
Author(s):  
M. P. Denne
Keyword(s):  
Light Intensity ◽  
Wall Thickness ◽  
Ring Width ◽  
Dry Weight ◽  
Main Stem ◽  
Wood Production ◽  
Leaf Weight ◽  
Total Leaf ◽  
Leaf Dry Weight ◽  
Tracheid Production

The seasonal progress of wood production and variation in tracheid dimensions were followed systematically along the trunk and main branches of Piceasitchensis trees and analysed in relation to the distribution of light intensity and leaf weight as the canopy develops. The aim was to provide data towards building models to predict effects of management on within-tree patterns of wood production and structure. Tracheid production began earliest at the tips of branches towards the base of the crown; the data show that tracheid production in the main stem began earliest several internodes below the leader, its onset progressing faster and having a shorter distance to travel down the upper branches. Tracheid production appeared to cease simultaneously throughout the trunk in codominant trees; it ceased earlier in severely suppressed trees, which consequently produced little or no latewood.In the main stem, maximum ring width occurred at least one internode above that carrying maximum total leaf dry weight. Maximum rate of tracheid production occurred one or two internodes above those having maximum current leaf dry weight, several internodes above the maximum total leaf weight. In branches, rate of wood production was closely correlated with light intensity.The seasonal increase in wall thickness from early- to latewood occurred more rapidly as you progress down the main stem to below the crown in 16-year-old trees; hence, Mork latewood began progressively earlier lower down the stem; this pattern was not developed in the trunk of younger trees. In all branches, latewood began earlier at the base than at the tip, owing to a more rapid seasonal increase in wall thickness towards the branch base. Tracheid diameter increased from the leader down to midcrown. In branches, partial correlations suggest that tracheid diameter varied with light intensity at the tip but inversely with whorl number at the branch base.

scholarly journals On the applicability of the pipe model theory on the chestnut tree (Castanea sativa Mill.)

Trees ◽  
2015 ◽  
Vol 29 (2) ◽  
pp. 321-332 ◽  
Author(s):  
Eric Gehring ◽  
Gianni Boris Pezzatti ◽  
Patrik Krebs ◽  
Stefano Mazzoleni ◽  
Marco Conedera
Keyword(s):  
Model Theory ◽  
Castanea Sativa ◽  
Chestnut Tree ◽  
Pipe Model ◽  
Castanea Sativa Mill ◽  
Pipe Model Theory

scholarly journals Karakter Agronomi yang Berpengaruh Terhadap Hasil dan Mutu Rajangan Kering Tembakau Temanggung

2016 ◽  
Vol 3 (1) ◽  
pp. 17
Author(s):  
. Djumali
Keyword(s):  
Leaf Area ◽  
Plant Height ◽  
Block Design ◽  
Dry Weight ◽  
Leaf Angle ◽  
Yield And Quality ◽  
Leaf Weight ◽  
Genetic Characters ◽  
Leaf Dry Weight

<p>Hasil dan mutu tembakau temanggung merupakan hasil interaksi pengaruh genetik tanaman dan kondisi ling-kungan tumbuh. Pada tembakau virginia, peubah-peubah agronomi tanaman merupakan karakter genetik ta-naman yang mempengaruhi hasil dan mutu. Pada tembakau temanggung, hal ini belum diketahui. Penelitian yang bertujuan untuk memperoleh peubah agronomi sebagai karakter genetik tembakau temanggung dan ka-itannya dengan hasil dan mutu rajangan kering dilakukan di rumah kaca Balittas, Malang sejak Maret–Agus-tus 2008. Sembilan kultivar tembakau temanggung disusun dalam rancangan acak kelompok yang diulang ti-ga kali. Pengamatan dilakukan terhadap peubah agronomi yang dimulai pada saat pemangkasan sampai pa-nen akhir. Hasil penelitian menunjukkan bahwa peubah agronomi yang meliputi tinggi tanaman, sudut daun, luas daun, jumlah daun, bobot spesifik daun, luas daun per helai, bobot kering tanaman, bobot kering tajuk, bobot kering akar, rasio tajuk/akar, bobot kering batang, bobot kering daun, bobot kering bunga, dan bobot kering tunas samping merupakan karakter genetik tembakau temanggung. Karakter agronomi tersebut mem-pengaruhi hasil dan mutu rajangan kering dengan total pengaruh masing-masing sebesar 92,8% dan 76,7%. Lima karakter agronomi utama yang mempengaruhi hasil rajangan kering adalah luas daun per helai, jumlah daun, bobot spesifik daun, tinggi tanaman, dan bobot kering daun dengan total pengaruh sebesar 89,4%. Adapun lima karakter agronomi utama yang mempengaruhi mutu rajangan kering adalah luas daun, rasio tajuk/akar, bobot kering tanaman, bobot kering bunga, dan tinggi tanaman dengan total pengaruh sebesar 75,7%.</p><p> </p><p>The yield and quality of temanggung tobacco are influenced by plant genetic and growth environmental. In virginia tobacco, plant agronomic variables were genetical characteristics determining yield and quality. The effect of agronomical characteristic on yield and quality of temanggung tobacco is not yet well defined. The research which aim to find plant agronomical variables as genetic characters and its relationship on dry slice and quality of temanggung tobacco, was conducted in glass house of IToFCRI, Malang from March–August 2008. Nine cultivars of temanggung tobacco were arranged in randomized block design and three replica-tions. The results showed that agronomic variables i.e. plant height, leaf angle, leaf area, number of leaf, spe-cific leaf weight, leaf area per strand, plant dry weight, shoot dry weight, root dry weight, shoot/root ratio, bast dry weight, leaf dry weight, flower dry weight, and sucker dry weight were genetic characters of temang-gung tobacco, which had effect on yield and quality with total effect of them were 92.8% and 76.7% res-pectively. Leaf area per strand, number of leaf, specific leaf weight, plant height, and leaf dry weight were agronomical characteristics which had significant effect on dry slice yield of 89.4%. Leaf area, shoot/ root ra-tio, plant dry weight, flower dry weight, and plant height were agronomical characteristics which had signi-ficant effect on quality of 75.7%.</p>

Relationship between Crop Growth Parameters and Seed Yield in CMS Analogues in Sunflower

Helia ◽  
2015 ◽  
Vol 38 (62) ◽  
pp. 109-120 ◽  
Author(s):  
Vikrant Tyagi ◽  
S. K. Dhillon
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Harvest Index ◽  
Dry Weight ◽  
Hybrid Breeding ◽  
Oleic Acid Content ◽  
Specific Leaf Weight ◽  
Area Index ◽  
Leaf Weight ◽  
Leaf Dry Weight

AbstractNine new cms analogues on the base of diversified cms sources were developed and evaluated for morphological, agronomic, physiological and biochemical traits, including the field resistance to the prevalent diseases of sunflower under Punjab conditions. As a result of this study, the most prospective cms analogues were designated for future use in hybrid breeding programme. The results revealed that selection for tall plants with large head size and high chlorophyll content may be associated with high grain yield as well as oil content and high oleic acid content in sunflower. Leaf dry weight, biological yield, harvest index, specific leaf weight and relative leaf water content had direct positive effect on grain yield. The harvest index, specific leaf weight/plant, leaf area index and leaf area had indirect effects (through leaf dry weight) on grain yield. These traits are advocated as selection criteria for grain yield improvement in sunflower.

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