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Population dynamics of hayscented fe...

Hill, James David.

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Population dynamics of hayscented fern (Dennstaedtia punctilobula) and its impact on forest composition, structure and dynamics.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Population dynamics of hayscented fern (Dennstaedtia punctilobula) and its impact on forest composition, structure and dynamics./
Author:	Hill, James David.
Description:	200 p.
Notes:	Source: Dissertation Abstracts International, Volume: 57-09, Section: B, page: 5449.
Contained By:	Dissertation Abstracts International57-09B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9707195
ISBN:	0591143372

Population dynamics of hayscented fern (Dennstaedtia punctilobula) and its impact on forest composition, structure and dynamics.
Hill, James David.

Population dynamics of hayscented fern (Dennstaedtia punctilobula) and its impact on forest composition, structure and dynamics. - 200 p.

Source: Dissertation Abstracts International, Volume: 57-09, Section: B, page: 5449.

Thesis (Ph.D.)--The University of Connecticut, 1996.

Hayscented fern abundance has increased over the last 50-80 years in forest understories of the northeastern United States. To understand hayscented fern's role in forest communities, particularly with observed tree regeneration failure, I quantified the distribution, population dynamics, rhizome growth, spore dispersal, and adverse effects on tree seedlings. I developed integrated models of canopy and fern dynamics to examine the fern's impact on forest communities.

ISBN: 0591143372Subjects--Topical Terms:

1017726
Biology, Ecology.

Population dynamics of hayscented fern (Dennstaedtia punctilobula) and its impact on forest composition, structure and dynamics.
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035 $a (UnM)AAI9707195
035 $a AAI9707195
040 $a UnM $c UnM
100 1 $a Hill, James David. $3 1949243
245 1 0 $a Population dynamics of hayscented fern (Dennstaedtia punctilobula) and its impact on forest composition, structure and dynamics.
300 $a 200 p.
500 $a Source: Dissertation Abstracts International, Volume: 57-09, Section: B, page: 5449.
502 $a Thesis (Ph.D.)--The University of Connecticut, 1996.
520 $a Hayscented fern abundance has increased over the last 50-80 years in forest understories of the northeastern United States. To understand hayscented fern's role in forest communities, particularly with observed tree regeneration failure, I quantified the distribution, population dynamics, rhizome growth, spore dispersal, and adverse effects on tree seedlings. I developed integrated models of canopy and fern dynamics to examine the fern's impact on forest communities.
520 $a Fern abundance increased with light availability, but was unrelated to soil moisture availability in the understory. Yearly changes in abundance were low for established clones. Increased or decreased shading above the fern resulted in decreased and increased fern abundance, respectively.
520 $a Rhizome growth rates, although slow, can be predicted from frond size; rhizomes of ramets with larger fronds spread more rapidly. Ramets with large fronds also produced spores and epipetiolar buds more frequently. Spores can be dispersed as far as 25 m. Path analysis indicated direct relationships of frond density, spore production, and epipetiolar bud production to light, whereas rhizome growth related directly to frond size.
520 $a Black cherry and red maple seedlings were the most abundant beneath fern. However, fern cover resulted in reduced numbers, growth, and survival of tree seedlings. Though growth rates were sufficient to predict tree seedling growth through the fern canopy, none did during this study. Light available to tree seedlings was directly affected by fern, decreasing as fern abundance increased.
520 $a I developed both static and dynamic models integrating canopy and fern dynamics; these models were calibrated and incorporated into the SORTIE forest simulator. The static model predicted dramatic changes in forest structure, whereas the dynamic model predicted subtle changes in composition and structure. Although the static model predictions conformed better to empirical studies and field observations, neither model predicted observed patterns precisely. Thus, considering direct effects of fern on tree seedlings alone can not explain the patterns of failed or delayed regeneration observed in the northeastern United States.
590 $a School code: 0056.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Agriculture, Forestry and Wildlife. $3 783690
650 4 $a Biology, Botany. $3 1017825
690 $a 0329
690 $a 0478
690 $a 0309
710 2 0 $a The University of Connecticut. $3 1249323
773 0 $t Dissertation Abstracts International $g 57-09B.
790 $a 0056
791 $a Ph.D.
792 $a 1996
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9707195