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A model of Pacific Rim log and lumber markets : structure and projections /Katz, Andres. January 1988 (has links)
Thesis (Ph. D.)--Oregon State University, 1988. / Typescript (photocopy). Includes bibliographical references (leaves 175-179). Also available on the World Wide Web.
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The effect of forest to pasture conversion on soil biological diversity and function : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Applied Science at Lincoln University /Lloyd, Davidson A. January 2008 (has links)
Thesis (M. Appl. Sc.) -- Lincoln University, 2008. / Also available via the World Wide Web.
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Influence of root exudates on soil microbial diversity and activity : a thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy at Lincoln University /Shi, Shengjing. January 2009 (has links)
Thesis (Ph. D.) -- Lincoln University, 2009. / Also available via the World Wide Web.
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Effects of landscape heterogeneity and clearfell harvest size on beetle (Coleoptera) biodiversity in plantation forests : a thesis submitted in partial fulfilment of the requirements of the degree of Doctor of Philosophy in the University of Canterbury /Pawson, S. M. January 2006 (has links)
Thesis (Ph. D.)--University of Canterbury, 2006. / Typescript (photocopy). Includes bibliographical references (p. 155-178). Also available via the World Wide Web.
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Leaf area index in closed canopies : an indicator of site quality : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Forestry Science, School of Forestry, Faculty of Engineering, the University of Canterbury /Coker, Graham William Russell. January 1900 (has links)
Thesis (M. For. Sc.)--University of Canterbury, 2006. / Typescript (photocopy). "August 2006." Includes bibliographical references (leaves 101-114). Also available via the World Wide Web.
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Aplicación de ondas ultrasónicas para la detección del cilindro defectuoso central en árboles podados de Pinus radiata (D.Don)Méndez Salazar, Ricardo January 2003 (has links)
Memoria para optar al Título
Profesional de Ingeniero Foresta
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Estudio del efecto de las ondas mecánicas sobre Reticulitermes hesperus Banks en madera de Pinus radiata (D. DON).Tejer Sotelo, Bruno January 2004 (has links)
Memoria para optar al Título
Profesional de Ingeniero de la Madera
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Biomass potential and nutrient export of mature pinus radiata in the southern Cape region of South AfricaVan Zyl, Salmon Johannes January 2015 (has links)
South Africa lags behind the rest of the world with regard to the availability of allometric biomass information. There is a complete lack of site specific allometric data for Pinus radiata in the southern Cape region, impeding investment in the renewable energy sector. This shortcoming was addressed by developing up-scalable, single tree biomass models. These models quantify the aboveground biomass of rotation age P. radiata grown in the southern Cape across a range of site conditions. The models use diameter at breast height (DBH) to predict the aboveground component biomass. A nutrient loss risk potential was assigned to each biomass component. Nineteen trees were destructively harvested using a full fresh weight sampling approach. Basic density was determined using a water displacement method, while Newton’s volume equation was used for stemwood volume determination. Log linear models were simultaneously regressed through seemingly unrelated regression (SUR) using the “Systemfit” R statistical package to force component additivity. A categorical variable was applied to the models, grouping the data into two Site Index (SI) based categories, namely “Low” SI and “Medium to High” SI, to account for inter-site variability. The corrected Akaike Information Criteria (AICc) and coefficient of determination (R2) was used to determine the goodness of fit of the models. The McElroy R2 for the SUR system was 0.95. Biomass models were developed that are able to predict various tree component masses at high levels of certainty within site and stand attribute ranges similar to this study. The importance of accurate, site specific wood basic density was demonstrated by its substantial weighting on stem and hence total biomass. Results showed that the stemwood mean basic density range was between 503 kg m-3 and 517 kg m-3 for the “Low” SI sites and 458 kg m-3 for the “Medium to High” SI sites. Site quality can have a major impact on the models, particularly on poorer sites where stemwood production is proportionally less than other tree components. Total aboveground biomass was estimated to range between 58.61 odt ha-1 and 70.85 odt ha-1 for “Low” SI sites, and 185.31 odt ha-1 to 266.58 odt ha-1 for “Medium to High” SI sites. Stemwood biomass accounted for 65% of the total aboveground biomass for “Low” SI sites and 70% for “Medium to High” SI sites.
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Initial characterization of the 5S and ribosomal gene families in Pinus radiataGorman, Susan Wilkie January 1992 (has links)
No description available.
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Growth responses to fertilizer application of thinned, mid-rotation Pinus radiata stands across a soil water availability gradient in the Boland area of the Western CapeChikumbu, Vavariro 12 1900 (has links)
Thesis (MscFor)--Stellenbosch University, 2011. / ENGLISH ABSTRACT: The purpose of the study was to investigate the effect of mid rotation fertilizer application
on leaf area index (LAI), basal area and volume increment in thinned Pinus radiata stands
on the most common soils of the Boland region in the Western Cape.
The study was conducted on a range of sites in the Boland region of MTO Forestry
Company, chosen to reflect the two most common soil types and a water availability
gradient in each soil type. A factorial combination of fertilizer treatments with three levels
each for nitrogen (N) at 0, 100 and 200 kg ha-1 and phosphorus (P) at 0, 50 and 100 kg ha-
1 was used. This design was replicated four times across a gradient of water availability
for each of the two common soil groups, forming a complete trial series. All replications
were laid out in P. radiata stands that had received their mid-rotation thinning prior to
treatment implementation.
LAI, diameter at breast height and height measurements as well as foliar analysis were
determined before the implementation of the study in 2008 and then subsequently at
predetermined intervals in 2009 and 2010. Leaf area index and stem volume increment
were measured in order to evaluate the influence on growth efficiency. LAI was estimated
using the gap fraction method with the use of a ceptometer. Volume increment was
calculated using diameter and height measurements and basal area was calculated by
means of diameter measurements. The abovementioned growth responses were then
used to determine the effect of increased nutrient availability on stand growth.
There were no significant interactions detected between any of the factors, N, P and water
availability class in their effect on LAI, basal area, volume increment and growth efficiency.
LAI increment responded significantly to N and P in the first year but only to P in the second year after treatment. Significant basal area responses to N and P were recorded
in the second but not the first year. This might have been due to the fact that trees had to
re-build their canopies after thinning before a basal area response could be obtained. For
the variables where an analysis of total growth response over the two year period was
done, basal area increment and volume increment significantly responded to the
application of nitrogen but not to phosphorus. Growth efficiency was not significantly
influenced by either nitrogen or phosphorus over the full two year monitoring period.
Water availability class consistently and significantly influenced basal area increment,
volume increment and growth efficiency over the two year period as well as during year
one and year two.
The best responses generally occurred as a result of the additive effects of N and P. The
growth response did not remain the same across the water availability classes. The wetter
sites tended to have greater responses than the drier sites. Although these are still early
results, the growth responses could be attributed to an increase in LAI. Nutrient analysis
through vector analysis indicated that the additional N and P from fertilizer application
were taken up by the trees thereby resulting in greater LAI and increased stem wood
production. / AFRIKAANSE OPSOMMING: Die studie het ten doel gestel om die effek van mid-rotasie bemesting op blaar oppervlak
indeks (BOI), basale oppervlakte- en volume aanwas te ondersoek in gedunde opstande
van Pinus radiata op die mees algemene grondtipes van die Bolandstreek, Wes-Kaapland.
Eksperimente is uitgelê oor 'n reeks van groeiplekke in die Bolandstreek wat gekies is om
'n water beskibaarheidsgradient te verteenwoordig oor elk van die twee mees algemene
grondtipes. 'n Faktoriaal-kombinasie van kunsmisbehandelings met drie vlakke elk van
stikstof [(N) teen 0, 100 en 200 kg ha-1] en fosfor [(P) teen 0, 50 en 100 kg ha-1] is
toegedien. Hierdie ontwerp is vier maal herhaal oor 'n gradient van grondwater
beskikbaarheid, oor elk van die twee mees algemene grondtipes, om sodoende 'n
volledige eksperimentele reeks te vorm. Elke herhaling is uitgelê in 'n P. radiata opstand
wat reeds 'n mid-rotasie dunning ondergaan het voor implementering van die kunsmis
behandelings.
Metings van BOI, deursnee op borshoogte, boomhoogte asook blaarmonsters is geneem
voor implementering in 2008 en daarna met vooraf bepaalde tussenposes in 2009 en
2010. Die BOI en stam volume aanwas is bepaal om die effek van behandelings op groeieffektiwiteit
te evalueer. Die gaping fraksie tegniek is gebruik om BOI te skat met behulp
van 'n sonvlek septometer. Volume aanwas is bereken vanaf deursnee en hoogtemetings
en basale oppervlak aanwas vanaf deursnee-metings. Metings van al bogenoemde
groeireaksies is gebruik om die effek van verhoogde voedingstof beskikbaarheid op
opstandsgroei te evalueer.
Daar was geen betekenisvolle interaksies tussen enige van die faktore N, P of water
beskikbaarheidsklas met betrekking tot reaksies op BOI, basale oppervlak- en volume aanwas of groei-effektiwiteit nie. Die BOI het betekenisvol gereageer op N en P in die
eerste jaar, maar slegs op P in die tweede jaar na behandeling. Basale oppervlakte
aanwas is betekenisvol verbeter deur N en P in die tweede jaar maar nie in die eerste jaar
nie. Dit is waarskynlik as gevolg van die feit dat opstande eers hul kroondak moes herstel
(na dunnings) voordat 'n reaksie in basale oppervlak verkry kon word. Vir die
veranderlikes waar 'n analise van die groeireaksie oor die volle twee jaar
moniteringsperiode gedoen is, het basale oppervlak- en volume aanwas betekenisvol
gereageer op stikstof maar nie op fosfor nie. Groei-effektiwiteit is nie betekenisvol
geaffekteer deur N of P oor die volle twee jaar moniteringsperiode nie. Water
beskikbaarheidsklas het basale oppervlak en volume aanwas asook groei-effektiwiteit
betekenisvol en voortdurend beïnvloed in die eerste en tweede jaar, asook gedurende die
volle twee jaar moniteringsperiode.
Die beste groeireaksie is oor die algemeen verkry waar N en P gesamentlik toegedien is
en waar dus aanvullende reaksies verkry is. Groeireaksies het betekenisvol verskil na
gelang van water beskikbaarheidsklas, met die grootste reaksie op die natste groeiplekke.
Hoewel hierdie vroeë resultate is, kan ons die meganisme van die reaksie primêr toeskryf
aan 'n toename in BOI. Vektor analise van blaar voedingstof vlakke het aangedui dat
addisionele N en P na kunsmis toediening opgeneem is, wat die weg gebaan het vir 'n
toename in BOI en verhoogde volume aanwas.
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