Conifer water potential as influenced by stand density and environmental factors

1973 ◽  
Vol 51 (12) ◽  
pp. 2333-2337 ◽  
Author(s):  
Carl L. Wambolt
Keyword(s):  
Water Potential ◽  
Vapor Pressure Deficit ◽  
Plant Density ◽  
Correlation Coefficients ◽  
Stand Density ◽  
Quantitative Evidence ◽  
Sand Temperature ◽  
Highly Correlated ◽  
Relationship Of ◽  
The Relationship

An investigation of several conifer species was conducted to evaluate the influence of atmospheric, edaphic, topographic, and vegetation variables of the environment on water potential. Correlation coefficients averaged close to 1.0 for the relationship of plant density to water potential when other environmental influences were static. This was interpreted as quantitative evidence of the intraspecific competition for available moisture by plants. Water potential values of 21 stands of coniferous trees, 3 each of seven species, were quite highly correlated (R = 0.84) to elevation, percentage sand, temperature, relative humidity, and vapor pressure deficit, even though the stands were found in widely divergent habitats.

Carbon balance in relation to drying in four epiphytic mosses growing in different vertical ranges

1979 ◽  
Vol 57 (19) ◽  
pp. 1994-1998 ◽  
Author(s):  
Peter L. Tobiessen ◽  
Nancy G. Slack ◽  
Keith A. Mott
Keyword(s):  
Water Potential ◽  
Water Content ◽  
Carbon Balance ◽  
The Other ◽  
Moss Species ◽  
Relationship Of ◽  
The Relationship ◽  
Neckera Pennata ◽  
Lower Water Content ◽  
Photosynthesis And Respiration

The response of photosynthesis and respiration to drying was measured in four species of epiphytic mosses, Ulota crispa (Hedw.) Brid., Neckera pennata Hedw., Anomodon rugellii (C. Mull.) Keissl., and Plagiomnium cuspidatum (Hedw.) T. Kop., from habitats along a desiccation gradient. There was little difference among the mosses in these responses. The relationship of water content to water potential did differ among the mosses, with Plagiomnium, the facultative epiphyte, showing a typical response of more mesic species and the other three showing a more xeric response, i.e., water potential does not begin to fall steeply until a lower water content is reached in Ulota, Neckera, and Anomodon. Both photosynthesis and respiration in all four moss species were quite sensitive to moderate water stress.

scholarly journals ESTIMATION OF EFFICIENCY OF CONSTRUCTION OF AGRO-PHYTOCENOSES AND FERTILIZER OF THE OIL RADISH ON THE BASIS OF THE MODULAR-VITALITY METHOD

2019 ◽  
pp. 54-78
Author(s):  
Yaroslav Tsytsiura
Keyword(s):  
Plant Density ◽  
Morphological Characters ◽  
Climatic Conditions ◽  
Morphological Integration ◽  
Plant Oil ◽  
Long Term Study ◽  
Relationship Of ◽  
The Relationship ◽  
Fertilizer Rates

The article presents the results of a long-term study of the features of the phytocenology of agrophytocenoses of oil radish using different methods for assessing their condition and studying the tactics of the plant vitality strategy. A comprehensive assessment was made of the effect of changes in row spacing, seeding rates and fertilizer rates on the formation of various plant morphotypes, the variability of morphological characters and the general characteristics of plant viability. Three idiotypes of the plant oil radish were identified in a vertical study of agrophytocenosis, on the basis of which a detailed analysis of the variability of each group and a statistical assessment of the reliability of its existence were carried out. The features of the morphological integration of each tier are analyzed and its impact on the formation of the overall field productivity is evaluated. Based on the modular and vitality grouping, the effectiveness and feasibility of combining various options for plant density and fertilizer in the range of 30-90 kg of active substance per 1 ha were evaluated. Conclusions are drawn about the desired model of agrophytocenosis of oil radish based on the characteristics of its vital tactics and the goals of its growing. Grouping was carried out according to a variety of morphological traits of plants in the population and the possibilities of applying the basic patterns of phytocenology in their application to radish oilseed plants were evaluated. Through the use of regression analysis, the influence of climatic conditions on the formation of various morphological types of plants and the nature of the relationship of plants of oil radish in cenoses of various densities against the background of various fertilizer options has been evaluated. The main promising areas for further research on the peculiarities of creating highly productive and highly adaptable agrophytocenoses of oil radish have been outlined.

Relationship of Manifest Aggressiveness to Aggressive Word Associations

1969 ◽  
Vol 25 (3) ◽  
pp. 711-714 ◽  
Author(s):  
Russell G. Geen ◽  
Robert George
Keyword(s):  
Verbal Behavior ◽  
Social Desirability ◽  
Habit Strength ◽  
Self Report ◽  
Social Desirability Scale ◽  
Word Associations ◽  
Highly Correlated ◽  
Cue Words ◽  
Relationship Of ◽  
The Relationship

A self-report inventory made up of items from the Buss-Durkee manifest aggressiveness scales, the Marlowe-Crowne Social Desirability Scale, and the Masculinity-Femininity scale of the Guilford-Zimmerman Temperament Survey was administered to 72 men along with a test of verbal associations to aggressive and neutral cue words. The number of aggressive associations made to aggressive cue words was highly correlated with over-all manifest aggressiveness and with two of the aggressiveness subscales. The results were discussed in terms of the relationship of aggressiveness habit strength to verbal behavior.

Comparison of Two Sociometric Devices for Measuring Personality Integration

1971 ◽  
Vol 29 (3_suppl) ◽  
pp. 1035-1039
Author(s):  
Logan Wright
Keyword(s):  
Locus Of Control ◽  
The Other ◽  
Self Concept ◽  
College Age ◽  
Functional Measure ◽  
Personality Integration ◽  
Validity Measures ◽  
Highly Correlated ◽  
Relationship Of ◽  
The Relationship

A comparison was made of two sociometric measures of personality integration. Contrary to prediction, the more brief, 6-item PIRT scale was significantly more reliable ( r11 = .84) than the lengthier 30-item ESD scale ( r11 = .74). Also contrary to prediction, neither test was more highly correlated than the other (and therefore more valid) with any of 8 construct-validity measures. It was concluded that the PIRT was the more functional measure and therefore recommended for use in future personality integration research. Earlier results concerning the relationship of personality integration to self-concept and environmental contact, as well as locus of control and locus of evaluation in college-age females, were replicated.

scholarly journals A Possible Relationship Between Toxicity and Carcinogenicity

1986 ◽  
Vol 5 (2) ◽  
pp. 137-151 ◽  
Author(s):  
L. Zeise ◽  
E. A.C. Crouch ◽  
R. Wilson
Keyword(s):  
Acute Toxicity ◽  
National Cancer Institute ◽  
Chronic Toxicity ◽  
Positive Finding ◽  
National Toxicology Program ◽  
Technical Report Series ◽  
Technical Report ◽  
Highly Correlated ◽  
Relationship Of ◽  
The Relationship

Carcinogenic response is compared to noncarcinogenic toxicity in that group of chemicals tested by the National Cancer Institute (NCI) and National Toxicology Program (NTP) between 1976 and 1982 and reported in the Carcinogenesis Technical Report Series. A positive finding of carcinogenicity in the bioassay is correlated with the degree of noncarcinogenic chronic toxicity of the dose applied. Comparisons of acute toxicity (LD50) with carcinogenic potency show that they are correlated, but the correlation may in part be an artifact, since doses used in the NCI/NTP carcinogenesis bioassays are toxic and because reliable measures of potency can only be derived for positive carcinogenic responses. The high correlations for certain classes of chemicals and the relationship of chronic toxicity to positive carcinogenic finding suggest that these relationships are more than spurious. Since toxicities in different species are highly correlated, these findings imply that carcinogenicities in different species are also correlated.

scholarly journals Physiological and anthropometric determinants of critical power, W′ and the reconstitution of W′ in trained and untrained male cyclists

2020 ◽  
Vol 120 (11) ◽  
pp. 2349-2359 ◽  
Author(s):  
Alan Chorley ◽  
Richard P. Bott ◽  
Simon Marwood ◽  
Kevin L. Lamb
Keyword(s):  
Aerobic Fitness ◽  
Maximal Exercise ◽  
Critical Power ◽  
Correlation Coefficients ◽  
Trained Group ◽  
Anthropometric Characteristics ◽  
Pearson's Correlation ◽  
Key Aspects ◽  
Relationship Of ◽  
The Relationship

Abstract Purpose This study examined the relationship of physiological and anthropometric characteristics with parameters of the critical power (CP) model, and in particular the reconstitution of W′ following successive bouts of maximal exercise, amongst trained and untrained cyclists. Methods Twenty male adults (trained nine; untrained 11; age 39 ± 15 year; mass 74.7 ± 8.7 kg; V̇O2max 58.0 ± 8.7 mL kg−1 min−1) completed three incremental ramps (20 W min−1) to exhaustion interspersed with 2-min recoveries. Pearson’s correlation coefficients were used to assess relationships for W′ reconstitution after the first recovery (W′rec1), the delta in W′ reconstituted between recoveries (∆W′rec), CP and W′. Results CP was strongly related to V̇O2max for both trained (r = 0.82) and untrained participants (r = 0.71), whereas W′ was related to V̇O2max when both groups were considered together (r = 0.54). W′rec1 was strongly related to V̇O2max for the trained (r = 0.81) but not untrained (r = 0.18); similarly, ∆W′rec was strongly related to V̇O2max (r = − 0.85) and CP (r = − 0.71) in the trained group only. Conclusions Notable physiological relationships between parameters of aerobic fitness and the measurements of W′ reconstitution were observed, which differed among groups. The amount of W′ reconstitution and the maintenance of W′ reconstitution that occurred with repeated bouts of maximal exercise were found to be related to key measures of aerobic fitness such as CP and V̇O2max. This data demonstrates that trained cyclists wishing to improve their rate of W′ reconstitution following repeated efforts should focus training on improving key aspects of aerobic fitness such as V̇O2max and CP.

Monte Carlo Study of Dispersive Transport in Glassy Electrolytes

1994 ◽  
Vol 369 ◽  
Author(s):  
D. Knödler ◽  
P. Pendzig ◽  
W. Dieterich
Keyword(s):  
Monte Carlo ◽  
Lattice Gas ◽  
Monte Carlo Study ◽  
Power Laws ◽  
Dispersive Transport ◽  
Coulombic Interactions ◽  
Highly Correlated ◽  
Relationship Of ◽  
The Relationship ◽  
Network Glasses

AbstractA lattice-gas model is presented, where ions are diffusing in an energy landscape due to immobile, randomly placed counterions. All Coulombic interactions are taken into account.By Monte Carlo simulations we obtain the ac-conductivity, which shows strong dispersion in the form of power-laws. In a separate study we investigate a restricted model, where long-range diffusion is suppressed. These calculations suggest that the response at high frequencies can be interpreted in terms of highly correlated, local motions of dipolar character. Conductivity exponents n1 near unity or even exceeding unity arefound in that regime. We discuss the relationship of these results to experiments on ionic transport in alkali-doped network glasses.

THE INFLUENCE OF SOME PHYSICAL AND CHEMICAL PROPERTIES ON SOIL AGGREGATION AND RESPONSE TO VAMA

1966 ◽  
Vol 46 (2) ◽  
pp. 155-160 ◽  
Author(s):  
G. R. Saini ◽  
A. A. MacLean ◽  
J. J. Doyle
Keyword(s):  
Organic Matter ◽  
Soil Properties ◽  
Chemical Properties ◽  
Correlation Coefficients ◽  
Multiple Correlation Coefficient ◽  
Mean Weight Diameter ◽  
The Mean ◽  
Relationship Of ◽  
Physical And Chemical ◽  
The Relationship

The relationship of the mean weight diameter of water-stable aggregates to certain soil properties (clay, organic matter, free iron, free aluminum, and polysaccharide contents) and the relationship of the increase in aggregation caused by VAMA to the same properties of 24 New Brunswick soils were evaluated by correlation and regression analyses.Simple correlation coefficients relating aggregation to soil properties indicated that organic matter (r = 0.627), polysaccharides (r = 0.602), and aluminum (r = 0.679) were the most important factors. However, when the influence of each factor was separated by partial correlation, the coefficients were not significant. On the other hand, the combined effects of all factors as indicated by the multiple correlation coefficient (r = 0.743) was significant at the 1% level. The effect of the same soil properties on response to VAMA, as shown by increase in mean weight diameter, indicated that clay exerted the greatest influence. The relationship with other factors was nonsignificant.

scholarly journals Hourly Relationship between Reference Evapotranspiration and Shoot Shrinkage in Walnut Trees and Pomegranate under Deficit Irrigation

Plants ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 31
Author(s):  
Eduardo Salgado ◽  
Nieggiorba Livellara ◽  
Esteban Chaigneau ◽  
Fernando Varas ◽  
Italo F. Cuneo
Keyword(s):  
Water Potential ◽  
Deficit Irrigation ◽  
Reference Evapotranspiration ◽  
The Novel ◽  
The Past ◽  
Slope Analysis ◽  
Daily Scale ◽  
Relationship Of ◽  
The Relationship ◽  
Better Than

Diameter fluctuations of branches, shoots, or fruits are related to plant transpiration and water potential. In the past, several models have related dendrometric variables and evapotranspiration on a daily scale. However, trunk–branch shrinkage occurs only between dawn and midday, while evapotranspiration occurs most of the day from sunrise to sunset. Previous models have failed to incorporate this key fact. The objective of the present study was to assess the relationship of hourly daily shrinkage (HDS) between dawn and the next 4 h to the hourly reference evapotranspiration (EToh) of the same period in walnut trees and pomegranate plants under different irrigation regimes. Our data show that the relationship between EToh and HDS is much better than several previous models that included maximum daily shrinkage (MDS) and reference evapotranspiration (ETo). The novel slope analysis of the relationship between HDS versus time used here corresponds to the velocity at which the HDS occurs, which depends on the ETo intensity at that moment. This new method of analyzing this type of data calls for a revision of these models and sets a new baseline for future analysis.

scholarly journals Modeling Maize Canopy Morphology in Response to Increased Plant Density

2021 ◽  
Vol 11 ◽  
Author(s):  
Liang He ◽  
Weiwei Sun ◽  
Xiang Chen ◽  
Liqi Han ◽  
Jincai Li ◽  
...  
Keyword(s):  
Field Data ◽  
Plant Density ◽  
Block Design ◽  
Linear Equations ◽  
Crop Productivity ◽  
Final Size ◽  
Plant Densities ◽  
Interplant Competition ◽  
Relationship Of ◽  
The Relationship

Increased plant density markedly affects canopy morphophysiological activities and crop productivity. This study aims to model maize canopy final morphology under increased interplant competition by revising a functional–structural plant model, i.e., ADEL-Maize. A 2-year field experiment was conducted at Mengcheng, Anhui Province, China, in 2016 and 2018. A randomized complete block design of five plant densities (PDs), i.e., 4.5, 6, 7.5, 9, and 15 plants m–2, with three replications was applied using a hybrid, i.e., Zhengdan 958. Canopy morphology at different PDs was measured with destructive samplings when maize canopy was fully expanded. The relationship of changes of organ morphology in relation to increased plant density was analyzed based on 2016 data. The ADEL-Maize was first calibrated for the hybrid at 4.5 plants m–2 and then revised by introducing relationships identified from 2016 data, followed by independent validation with 2018 field data. A heatmap visualization was shown to clearly illustrate the effects of increased plant density on final morphology of laminae, sheaths, and internodes. The logarithmic + linear equations were found to fit changes for the organ size versus increased plant density for phytomers excluding ear position or linear equations for the phytomer at ear position based on 2016 field data. The revision was then further tested independently by having achieved satisfactory agreements between the simulations and observations in canopy size under different PDs with 2018 field data. In conclusion, this study has characterized the relationship between canopy morphology and increased interplant competition for use in the ADEL-Maize and realized the simulations of final size of laminae, sheaths, and internodes, as affected by increased plant density, laying a foundation to test an ideotype for maize withstanding high interplant competition.

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