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The ecology of calcareous fens in Pa...

Johnson, James Bradley.

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The ecology of calcareous fens in Park County, Colorado.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The ecology of calcareous fens in Park County, Colorado./
作者:	Johnson, James Bradley.
面頁冊數:	299 p.
附註:	Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 3962.
Contained By:	Dissertation Abstracts International61-08B.
標題:	Biology, Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9981342
ISBN:	0599878258

The ecology of calcareous fens in Park County, Colorado.
Johnson, James Bradley.

The ecology of calcareous fens in Park County, Colorado. - 299 p.

Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 3962.

Thesis (Ph.D.)--Colorado State University, 2000.

The plant ecology and effects of disturbance were studied on three calcareous fens in South Park, Colorado. All the fens studied were classified as extremely rich, based on species indicators and water chemistry. Detrended correspondence analysis, canonical correspondence analysis and two-way indicator species analysis (TWINSPAN) were used to evaluate fen vegetational patterns and classify vegetational assemblages. Vegetation on and between the fens reacts to five primary gradients: water table height, minerotrophy, microtopography, fen margin to expanse, and regional differences. Vegetation types resulting from these gradients were classified into five classes, eight subclasses, and twelve associations.

ISBN: 0599878258Subjects--Topical Terms:

1017726
Biology, Ecology.

The ecology of calcareous fens in Park County, Colorado.
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245 1 4 $a The ecology of calcareous fens in Park County, Colorado.
300 $a 299 p.
500 $a Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 3962.
500 $a Adviser: Joan Herbers.
502 $a Thesis (Ph.D.)--Colorado State University, 2000.
520 $a The plant ecology and effects of disturbance were studied on three calcareous fens in South Park, Colorado. All the fens studied were classified as extremely rich, based on species indicators and water chemistry. Detrended correspondence analysis, canonical correspondence analysis and two-way indicator species analysis (TWINSPAN) were used to evaluate fen vegetational patterns and classify vegetational assemblages. Vegetation on and between the fens reacts to five primary gradients: water table height, minerotrophy, microtopography, fen margin to expanse, and regional differences. Vegetation types resulting from these gradients were classified into five classes, eight subclasses, and twelve associations.
520 $a An evaluation of the effects of peat mining and ditching were made in a comparative study. Peat mining was found to significantly impact vegetational composition, species richness and vegetative cover even many years after the cessation of the disturbance. Mining was also found to affect several soil attributes and water quality. Extremely high uranium levels were found to be closely associated with peat mining activity at one of the fens. Fen drainage was found to significantly change vegetational composition, soil structure, and several water chemistry parameters.
520 $a Revegetation following experimental disruption was studied to elucidate patterns of secondary succession and evaluate the role of the soil propagule bank in fen restoration. Plots within experimental blocks were manipulated to approximate the effects of peat mining either with no restoration applied or with stockpiled peat reintroduced. Experimental manipulation had major effects on plot vegetation, although in blocks located in previously impacted areas plot vegetation rebounded quickly to near pre-treatment condition. In areas with intact wetland hydrology, seeds were found to play a minor role in revegetation with most growth originating from vegetative structures. In artificially drained areas, sexual reproduction was the dominant mode of revegetation. Replacement of the upper 10cm of native soil significantly speeded revegetation by supplying the plot with native topsoil and viable sexual and asexual propagules. Based on these results, stockpiling and reintroduction of native topsoil is a recommended approach to restoring disturbed fens.
590 $a School code: 0053.
650 4 $a Biology, Ecology. $3 1017726
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9981342