Compensatory responses of CO2 exchange and biomass allocation and their effects on the relative growth rate of ponderosa pine in different CO2 and temperature regimes

Oecologia ◽  
1994 ◽  
Vol 98 (2) ◽  
pp. 159-166 ◽  
Author(s):  
R. M. Callaway ◽  
E. H. DeLucia ◽  
E. M. Thomas ◽  
W. H. Schlesinger
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Biomass Allocation ◽  
Ponderosa Pine ◽  
Co2 Exchange ◽  
Relative Growth ◽  
Compensatory Responses ◽  
Temperature Regimes

Interference of bull thistle (Cirsiumvulgare) with growth of ponderosa pine (Pinusponderosa) seedlings in a forest plantation

1993 ◽  
Vol 23 (8) ◽  
pp. 1507-1513 ◽  
Author(s):  
John M. Randall ◽  
Marcel Rejmánek
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Seedling Growth ◽  
Ponderosa Pine ◽  
First Year ◽  
Relative Growth ◽  
Path Analyses ◽  
Second Year ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

The biennial thistle Cirsiumvulgare (Savi) Tenore significantly reduced ponderosa pine (Pinusponderosa Dougl. ex Laws.) seedling growth during the second year of infestation but had insignificant effects in the first year when all thistles were in the rosette stage. Pine stem diameter relative growth rate was significantly negatively correlated with four different indices of thistle interference and with visual estimates of thistle cover. Total thistle density (adults + rosettes) within 2.0 m of target seedlings best explained differences in stem relative growth rate, but density of adults alone and visual estimates of thistle cover were nearly as good. Simple regressions indicated that soil moisture and pine predawn leaf water potential were significantly negatively correlated with thistle density and significantly positively correlated with stem relative growth rate, but multiple regressions and path analyses indicated that their effects on seedling growth were negligible relative to the other (unexplained) effects of thistle density. Foliar nitrogen, phosphorus, and potassium concentrations were not significantly correlated with thistle density and failed to explain differences in seedling growth. Although it remains unclear how thistles suppressed pine seedling growth, if these results hold true at other sites, plantation managers will have at their disposal relatively easy methods for assessing thistle interference.

scholarly journals Relative growth rate and biomass allocation in 20 Aegilops (Poaceae) species

2008 ◽  
Vol 140 (3) ◽  
pp. 425-437 ◽  
Author(s):  
RAFAEL VILLAR ◽  
ERIK J. VENEKLAAS ◽  
PEDRO JORDANO ◽  
HANS LAMBERS
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Biomass Allocation ◽  
Relative Growth

scholarly journals Flooding avoidance Triplaris gardneriana Wedd. (Polygonaceae): growth and morpho-anatomical aspects

2016 ◽  
Vol 38 (3) ◽  
pp. 341 ◽  
Author(s):  
Vanessa Pontara ◽  
Marcelo Leandro Bueno ◽  
Edna Scremin-Dias
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Biomass Allocation ◽  
Adventitious Roots ◽  
Central Cylinder ◽  
Response To Treatment ◽  
Vessel Element ◽  
Key Factors ◽  
Relative Growth

The aim of this study was to analyze the effect of flooding in Triplaris gardneriana Wedd, cultivated in drained soil (control) and in flooded condition. The experiment was developed in a greenhouse, using plants with 90 days after the emergency. The response to treatment was evaluated at 0, 30, 60 and 90 days. Growth measurements were made, such as biomass allocation, relative growth rate (RGR). Adventitious roots were not measured only observed, as well as the development of hypertrophied lenticels. The RGR was continuously reduced along the 90 days in flooding conditions for the roots, stem and leaves, compared to control. The flooding of the substrate caused alterations such as: increasing of the cortex width and diameter of the central cylinder of root and increasing the diameter of the vessel element of the root and stem. Results show that T. gardneriana remains under stress when submitted to flooding. Therefore, the production of structures as lenticels, aerenchyma and adventitious roots, structures related to the avoidance of this type of stress, were key factors for the maintenance and survival of T. gardneriana. 

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