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The reproductive ecology of Pinus ta...

LaDeau, Shannon Lea.

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The reproductive ecology of Pinus taeda growing in elevated carbon dioxide.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The reproductive ecology of Pinus taeda growing in elevated carbon dioxide./
作者:	LaDeau, Shannon Lea.
面頁冊數:	150 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2923.
Contained By:	Dissertation Abstracts International66-06B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3181478
ISBN:	9780542210303

The reproductive ecology of Pinus taeda growing in elevated carbon dioxide.
LaDeau, Shannon Lea.

The reproductive ecology of Pinus taeda growing in elevated carbon dioxide. - 150 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2923.

Thesis (Ph.D.)--Duke University, 2005.

Long-term forest response to changes in atmospheric CO2 will be largely determined by reproductive success. Reproductive success is determined by maturation rate (ontogeny), as well as flower, pollen, and seed production. These components are all difficult to quantify in nature where tree canopies overlap and dispersal distances can be large. Individual variability among trees and inter-annual variability in seed production further frustrate efforts to evaluate tree regeneration. The objective of this dissertation is to compare ontogeny and fecundity among individual Pinus taeda L. trees growing in ambient or elevated CO2 (ambient plus 200-mul l -1) since 1996. I use a combination of classical statistical techniques and hierarchical Bayes to evaluate ontogeny and individual tree fecundity, accounting for the complexity of experimentation in nature over multiple years.

ISBN: 9780542210303Subjects--Topical Terms:

1017726
Biology, Ecology.

The reproductive ecology of Pinus taeda growing in elevated carbon dioxide.
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245 1 4 $a The reproductive ecology of Pinus taeda growing in elevated carbon dioxide.
300 $a 150 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2923.
500 $a Supervisor: James S. Clark.
502 $a Thesis (Ph.D.)--Duke University, 2005.
520 $a Long-term forest response to changes in atmospheric CO2 will be largely determined by reproductive success. Reproductive success is determined by maturation rate (ontogeny), as well as flower, pollen, and seed production. These components are all difficult to quantify in nature where tree canopies overlap and dispersal distances can be large. Individual variability among trees and inter-annual variability in seed production further frustrate efforts to evaluate tree regeneration. The objective of this dissertation is to compare ontogeny and fecundity among individual Pinus taeda L. trees growing in ambient or elevated CO2 (ambient plus 200-mul l -1) since 1996. I use a combination of classical statistical techniques and hierarchical Bayes to evaluate ontogeny and individual tree fecundity, accounting for the complexity of experimentation in nature over multiple years.
520 $a Pinus taeda trees growing in future levels of atmospheric CO2 for seven years reached reproductive maturation earlier and at smaller diameters than ambient-grown trees and experienced greater fecundity. Twice the amount of carbon was allocated to observed seed cones in the CO 2 fumigated plots relative to ambient plots from 1997 to 2002 (means = 9733.8 g C per fumigated ring vs. 4658.4 g C per ambient ring). Large increases in seed production by P. taeda were not met by shifting resource allocation from seed mass or nitrogen content. Although germination success varied among years and individual plots, there was no consistent difference between CO2 treatments.
520 $a Trees growing in high CO2 also began producing pollen cones before ambient-grown trees. Pines growing in high CO2 produced more pollen per basal area than ambient-grown stands. Increased pollen production may have significant implications for seed quality, gene flow, and human health.
520 $a The data presented here demonstrate great potential for shifting individual resources in Pinus taeda, but also illustrate the need for a greater understanding of how tree fecundity affects ecosystem function. Long-term community response to changing CO2 concentrations will be primarily driven by species-specific reproductive success. The results shown in this study demonstrate great potential for increased reproductive biomass in one important piedmont species. Shifting allocation to reproduction may have direct effects on tree growth and longevity, but could also alter competitive dynamics and trophic interactions.
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650 4 $a Biology, Plant Physiology. $3 1017865
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710 2 0 $a Duke University. $3 569686
773 0 $t Dissertation Abstracts International $g 66-06B.
790 1 0 $a Clark, James S., $e advisor
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791 $a Ph.D.
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