Effect of local stand structure on leaf area, growth, and growth efficiency following thinning of white spruce

2016 ◽  
Vol 368 ◽  
pp. 55-62 ◽  
Author(s):  
Kwadwo Omari ◽  
David A. MacLean ◽  
Michael B. Lavigne ◽  
John A. Kershaw ◽  
Greg W. Adams
Keyword(s):  
Leaf Area ◽  
Stand Structure ◽  
White Spruce ◽  
Growth Efficiency ◽  
Area Growth ◽  
Leaf Area Growth

scholarly journals Application of the Richards function to the description of leaf area growth in maize (Zea mays L.)

2014 ◽  
Vol 63 (1) ◽  
pp. 5-7 ◽  
Author(s):  
Andrzej Grzegorczyk
Keyword(s):  
Zea Mays ◽  
Leaf Area ◽  
Nonlinear Regression ◽  
Growth Process ◽  
Zea Mays L ◽  
Logistic Function ◽  
Area Growth ◽  
Richards Function ◽  
Constant Coefficients ◽  
Leaf Area Growth

The leaf area growth in maize was approximated basing on the Richards function in the form of: y=A[l+b exp(-kt)]<sup>1/(1-m)</sup> . The constant coefficients of the Richards function were found by means of the Marquardt's method. The initial values of parameters were given basing on results of the preliminary approximation of the growth process by means of logistic function y = A[l+b exp(-kt)]<sup>-1</sup>. The procedure of nonlinear regression was found to be useful (curvilinear determination coefficient R<sup>2</sup> = 0.995). The Richards curve precisely describes the course of changes of the leaf area in maize since sprouting to a tassel flowering phase.

scholarly journals Interacting effects of soil fertility and atmospheric CO2 on leaf area growth and carbon gain physiology in Populus x euramericana (Dode) Guinier

1995 ◽  
Vol 129 (2) ◽  
pp. 253-263 ◽  
Author(s):  
PETER S. CURTIS ◽  
CHRISTOPH S. VOGEL ◽  
KURT S. PREGITZER ◽  
DONALD R. ZAK ◽  
JAMES A. TEERI
Keyword(s):  
Soil Fertility ◽  
Leaf Area ◽  
Atmospheric Co2 ◽  
Carbon Gain ◽  
Area Growth ◽  
Leaf Area Growth ◽  
Populus X Euramericana

The influence of low soil temperature on the growth of vesicular–arbuscular mycorrhizal Fraxinuspennsylvanica

1987 ◽  
Vol 17 (8) ◽  
pp. 951-956 ◽  
Author(s):  
C. P. Andersen ◽  
E. I. Sucoff ◽  
R. K. Dixon
Keyword(s):  
Leaf Area ◽  
Growth Rates ◽  
Root Zone ◽  
Arbuscular Mycorrhizal ◽  
Green Ash ◽  
P Content ◽  
Vesicular Arbuscular ◽  
Area Growth ◽  
Leaf Area Growth ◽  
Leaf P

Green ash (Fraxinuspennsylvanica Marsh.) seedlings were either inoculated with Glomusetunicatum or not inoculated and grown for approximately 5 weeks under glasshouse conditions to permit root colonization with vesicular–arbuscular (V–A) mycorrhizae. Two experiments were conducted to characterize V–A mycorrhizae influence on seedling growth at low root temperature. In experiment 1, seedlings were subjected to four root zone temperatures ranging from 7.5 to 20 °C for 24 days to measure leaf area and plant height on intact seedlings. In experiment 2, seedlings were exposed to root temperatures of 12.0, 16.0, and 20.0 °C for 30 days and seedlings were destructively harvested at 6-day intervals to measure growth variables and biomass distribution. Results of experiments 1 and 2 were similar. In experiment 1, leaf area growth of mycorrhizal seedlings was significantly greater than nonmycorrhizal controls at all temperatures. Relative leaf area growth rate was greater in mycorrhizal than nonmycorrhizal seedlings at 7.5 and 11.5 °C, similar between treatments at 15.5 °C, and greater in nonmycorrhizal seedlings at 20.0 °C, differences possibly resulting from the larger size of mycorrhizal seedlings at the start of the temperature treatments. In experiment 2, temperature treatments were imposed on seedlings of the same size. Mycorrhizal seedlings had greater leaf area growth rates and relative leaf area growth rates than nonmycorrhizal seedlings at all temperatures. Phosphorus concentrations and total P content in roots and leaves did not differ significantly between mycorrhizal treatments at any temperature; however, mycorrhizal seedlings had consistently greater leaf P content than nonmycorrhizal controls. Glomusetunicatum actively stimulates green ash growth at moderately low root temperatures.

AN ESTIMATION EQUATION FOR SQUASH LEAF AREA USING LEAF MEASUREMENTS

1986 ◽  
Vol 66 (3) ◽  
pp. 677-682 ◽  
Author(s):  
W. S. FARGO ◽  
E. L. BONJOUR ◽  
T. L. WAGNER
Keyword(s):  
Host Plant ◽  
Leaf Area ◽  
Cucurbita Pepo ◽  
Leaf Expansion ◽  
Individual Leaf ◽  
Area Growth ◽  
Area Increase ◽  
Total Plant ◽  
Leaf Area Growth ◽  
Growth Development

An equation was developed which may be used to estimate the area of all sizes of developing squash (Cucurbita pepo L.) leaves. The equation uses two leaf measurements (midrib length (ML) and the distance between tertiary lobes (TD)) which may be taken quickly in the laboratory or field without disturbing the host plant. The equation is:[Formula: see text]The equation is applicable in monitoring individual leaf expansion as well as total plant leaf area increase and in examining the dynamics of the plant under various environmental conditions.Key words: Cucurbita pepo L., leaf area, growth, development, leaf expansion

scholarly journals The relationship between leaf area growth and biomass accumulation in Arabidopsis thaliana

2015 ◽  
Vol 6 ◽  
Author(s):  
Sarathi M. Weraduwage ◽  
Jin Chen ◽  
Fransisca C. Anozie ◽  
Alejandro Morales ◽  
Sean E. Weise ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Leaf Area ◽  
Biomass Accumulation ◽  
Area Growth ◽  
Leaf Area Growth ◽  
The Relationship

The historical reconstruction of growth efficiency and its relationship to tree mortality in balsam fir ecosystems affected by spruce budworm

1994 ◽  
Vol 24 (11) ◽  
pp. 2208-2221 ◽  
Author(s):  
Marie R. Coyea ◽  
Hank A. Margolis
Keyword(s):  
Leaf Area ◽  
Tree Mortality ◽  
Basal Area ◽  
Spruce Budworm ◽  
Growth Efficiency ◽  
Balsam Fir ◽  
Tree Age ◽  
Basal Area Growth ◽  
Annual Growth Rings ◽  
Area Growth

The growth efficiencies (E; stemwood growth per unit leaf area) of balsam fir (Abiesbalsamea (L.) Mill.) trees from 20 stands were reconstructed over the 30-year period from 1960 to 1989 in order to determine if E could be used to predict tree mortality occurring during and after an epidemic of eastern spruce budworm (Choristoneurafumiferana (Clem.)). Growth efficiencies were reconstructed based on the relationship between age and the number of annual growth rings in the cross-sectional area of heartwood at breast height (R2 = 0.97) and on the previously demonstrated relationship between sapwood area and leaf area of balsam fir across a wide geographic area. Profile and logistic regression analyses demonstrated that apparent E (i.e., the historically reconstructed E) of surviving trees was greater than that of dead trees for every year of the 30-year analysis period. For trees in the 25- to 35-year age-class in 1960, apparent E was the only variable measured prior to the epidemic that was significantly related to balsam fir mortality. For all trees (aged 11 to 46 years in 1960), both tree age and apparent E were significant factors prior to the epidemic. During and following the epidemic, several of the more standard mensurational variables (e.g., diameter and basal area growth) were also significantly associated with balsam fir mortality, but apparent E had the highest levels of significance. Using logistical regression, critical E values below which trees would be predicted to die were calculated as 5-year running averages for the period prior to the epidemic (1960–1968). These were stable at around 0.17 × 10−4 m2 basal area growth•(m2 leaf area)−1•year−1. Following the epidemic, critical E values were again stable but at a lower level of around 0.07. There was a negative exponential relationship between apparent E and leaf area. Furthermore, for the same level of leaf area, surviving trees had a higher apparent E than trees that died, up to approximately 30 m2 of leaf area. These results suggest that growth efficiency should be considered as part of standard forest inventories in the balsam fir zone because of its ease of measure and its apparent ability to provide a sensitive, physiologically based index of forest health. Furthermore, the technique of historically reconstructing E demonstrated in this study may be of interest for other types of dendrochronological research.

Higher Leaf Area Growth Rate Contributes to Greater Vegetative Growth of F1 Rice Hybrids in the Tropics

2001 ◽  
Vol 4 (3) ◽  
pp. 184-188 ◽  
Author(s):  
Ma.Rebecca Laza ◽  
Shaobing Peng ◽  
Sanico Arnel ◽  
Visperas Romeo ◽  
Shigemi Akita
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Vegetative Growth ◽  
Area Growth ◽  
Leaf Area Growth ◽  
The Tropics
Sign in / Sign up

Export Citation Format

Share Document