Topic
Pinus radiata
About: Pinus radiata is a research topic. Over the lifetime, 2055 publications have been published within this topic receiving 40074 citations. The topic is also known as: Monterey Pine & Monterey pine.
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TL;DR: In this article, the scales of seed-bearing pine cones move in response to changes in relative humidity, releasing the cone's seeds when it is dry, and close up if it is damp.
Abstract: The scales of seed-bearing pine cones move in response to changes in relative humidity. The scales gape open when it is dry, releasing the cone's seeds1. When it is damp, the scales close up. The cells in a mature cone are dead, so the mechanism is passive: the structure of the scale and the walls of the cells composing the scale respond to changing relative humidity. Dissection of cones from the Monterey pine, Pinus radiata, revealed to us two types of scale growing from the main body of the cone — the ovuliferous scale and the bract scale. The larger ovuliferous scales respond to changes in relative humidity when removed from the body of the cone.
482 citations
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TL;DR: In an experiment in which root activity and thus mycorrhizal activity were reduced in small areas of an unthinned Pinus radiata stand, three treatments were applied to 1 × 1 m plots sited between the trees.
Abstract: FORMATION of the mor type of forest litter, characterized by slow decomposition, has been attributed to a number of factors1–3, but the effect of mycorrhizal fungi, though postulated4,5, has not been studied experimentally. We have conducted an experiment in which root activity and thus mycorrhizal activity were reduced in small areas of an unthinned Pinus radiata stand. The following treatments (three replicates in a randomized block design) were applied to 1 × 1 m plots sited between the trees.
342 citations
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TL;DR: Investigating phosphorus availability and associated processes in the rhizosphere of perennial ryegrass and radiata pine confirmed that microbial and enzyme activities played an important role in the mineralization of soil organic P, particularly under radita pine.
Abstract: A short-term glasshouse experiment was carried out with two grassland soils to investigate phosphorus (P) availability and associated processes in the rhizosphere of perennial ryegrass (Lolium perenne L.) and radiata pine (Pinus radiata D. Don.) using a thin slicing technique. Results showed that readily extracted forms of soil inorganic P were depleted by both ryegrass and radiata pine, although depletion zones extended further adjacent to radiata pine (5 mm) compared with ryegrass (3 mm). Accumulation of bicarbonate extractable organic P occurred in rhizosphere soil under both ryegrass and radiata pine, which was related to increased levels of microbial biomass. Enhanced depletion of sodium hydroxide extractable organic P apparent in the rhizosphere of radiata pine compared with ryegrass was related to the presence of greater concentrations of water-soluble organic C, microbial biomass and higher alkaline phosphatase and phosphodiesterase enzyme activities. These results confirmed that microbial and enzyme activities played an important role in the mineralization of soil organic P, particularly under radita pine.
239 citations
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TL;DR: In this paper, Fourier transformed infra-red (FTIR) was evaluated as an analytical tool for monitoring wood biodegradation, and multivariate analysis was applied to correlate chemical composition in wood samples with the FTIR spectral data.
229 citations
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TL;DR: In this article, a new analytical instrument was developed for rapid measurement of the transverse dimensions of tracheids in Australian plantation-grown Pinus radiata, which combines scannwig x-ray microdensitometry and image analysis.
Abstract: A new analytical Instrument has been developed for rapid measurement of the transverse dimensions of tracheids in Australian plantation-grown Pinus radiata. The Instrument combines scannwig x-ray microdensitometry and image analysis to produce radial profiles of tracheid diameter, wall thickness, coarseness and other wood mo hological characteristics. The tracheid diameter and density measurements are performed automatically on polished radial wood sections cut from increment cores. Corrections are made for the unavoidable deviations from radial alignment of the cores. The initial purpose of the Instrument is to provide comprehensive Information for tree breeding and silvicultural programs with particular emphasis on pulping and papermaking characteristics.
229 citations