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Functional consequences of long-term...

Laughlin, Daniel Charles.

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Functional consequences of long-term vegetation dynamics.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Functional consequences of long-term vegetation dynamics./
作者:	Laughlin, Daniel Charles.
面頁冊數:	187 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-08, Section: B, page: 4552.
Contained By:	Dissertation Abstracts International70-08B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3370630
ISBN:	9781109318494

Functional consequences of long-term vegetation dynamics.
Laughlin, Daniel Charles.

Functional consequences of long-term vegetation dynamics. - 187 p.

Source: Dissertation Abstracts International, Volume: 70-08, Section: B, page: 4552.

Thesis (Ph.D.)--Northern Arizona University, 2009.

Southwestern ponderosa pine forests have undergone significant changes in structure, composition, and function over the last century. Previous studies have clearly documented increased tree densities over time, yet fewer studies have been able to clearly illustrate the effects of these forest structural changes on understory composition and ecosystem function. This dissertation addresses the following question: How have southwestern ponderosa pine forests changed over time, and what are the consequences of these changes?

ISBN: 9781109318494Subjects--Topical Terms:

1017726
Biology, Ecology.

Functional consequences of long-term vegetation dynamics.
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245 1 0 $a Functional consequences of long-term vegetation dynamics.
300 $a 187 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-08, Section: B, page: 4552.
500 $a Adviser: Margaret M. Moore.
502 $a Thesis (Ph.D.)--Northern Arizona University, 2009.
520 $a Southwestern ponderosa pine forests have undergone significant changes in structure, composition, and function over the last century. Previous studies have clearly documented increased tree densities over time, yet fewer studies have been able to clearly illustrate the effects of these forest structural changes on understory composition and ecosystem function. This dissertation addresses the following question: How have southwestern ponderosa pine forests changed over time, and what are the consequences of these changes?
520 $a The primary gradient of functional trait variation among the common plant species was the leaf economics spectrum, which describes a gradient of resource acquisition and degradation. Species at the high end of this spectrum had high specific leaf area, high foliar and fine root nutrient concentrations, low leaf dry matter content, and low carbon-to-nitrogen mass ratios. The second axis of specialization reflected variation in plant size and root morphology.
520 $a I remeasured eighty-two permanent square meter chart quadrats that were established as early as 1912. Ponderosa pine density (i.e., basal area) increased significantly between the two time periods from an average of 4 to 29 m 2 ha-1. I found that the relative abundance of C 3 graminoids increased by 19% and C4 graminoids decreased by 18%. Understory plant foliar cover declined by approximately 21% century- 1, species richness declined by two species m-2 century -1, and two indices of functional diversity declined. Herbaceous plant species with short canopies, low specific root length, low leaf and fine root nitrogen concentrations, low foliar delta13C and delta 15N, and early flowering times had the highest relative abundance in sites where pine density increased the most.
520 $a Soil properties had stronger direct effects on nitrification potential than any direct plant community effects, but many of the abiotic soil effects were influenced by ponderosa pine density. The functional identity of the community (i.e., the location of the community along the leaf economics spectrum) was more important to nitrification potential than both total herbaceous biomass and the functional diversity of the plant community. Modeling results suggest that nitrification potential has declined significantly over the last century across the landscape due to changes in forest structure and the functional identity of the understory plant community.
520 $a Ecological restoration treatments that include removing small-diameter trees and reintroducing prescribed fire to the forest have high potential for reversing many of these long-term changes in herbaceous community composition, functional diversity, and ecosystem processes. However, responses will be contingent on a variety of factors, including land-use legacies, soil properties, and climate change. In particular, interannual climatic variation will constrain forest responses to restoration treatments.
590 $a School code: 0391.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Agriculture, Forestry and Wildlife. $3 783690
690 $a 0329
690 $a 0478
710 2 $a Northern Arizona University. $3 783744
773 0 $t Dissertation Abstracts International $g 70-08B.
790 1 0 $a Moore, Margaret M., $e advisor
790 $a 0391
791 $a Ph.D.
792 $a 2009
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