Pinus Flexilis James and it Environmental Relationships PDF Download
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Author: Merry Grace Lepper
Publisher:
ISBN:
Category : Ecology
Languages : en
Pages : 394
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Book Description
Author: Merry Grace Lepper
Publisher:
ISBN:
Category : Ecology
Languages : en
Pages : 394
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Book Description
Author: Merry Grace Lepper
Publisher:
ISBN:
Category : Limber pine
Languages : en
Pages : 394
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Author: Merry Grace Lepper
Publisher:
ISBN:
Category :
Languages : en
Pages : 438
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Author:
Publisher:
ISBN:
Category : Blister rust
Languages : en
Pages : 276
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 280
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Book Description
Author: Julio L. Betancourt
Publisher: University of Arizona Press
ISBN: 0816547157
Category : Science
Languages : en
Pages : 478
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Book Description
Over the past thirty years, late Quaternary environments in the arid interior of western North America have been revealed by a unique source of fossils: well-preserved fragments of plants and animals accumulated locally by packrats and quite often encased, amberlike, in large masses of crystallized urine. These packrat middens are ubiquitous in caves and rock crevices throughout the arid West, where they can lie preserved for tens of thousands of years. More than a thousand of these deposits have been dated and analyzed, and middens have supplanted pollen records as a touchstone for studying vegetation dynamics and climatic change in radiocarbon time (the last 40,000 years). Now, similar deposits made by other mammals like hyraxes are being reported from other parts of the world. This book brings together the findings and views of many of the researchers investigating fossil middens in the United States, Mexico, Africa, the Middle East, and Australia. The contributions serve to open a forum for methodological concerns, update the fossil record of various geographic regions, introduce new applications, and display the vast potential for fossil midden analysis in arid regions worldwide. The findings presented here will serve to foster regional research and to promote general studies devoted to global climate change. Included in the text are more than two hundred charts, photographs, and maps.
Author: Charles A. Reher
Publisher:
ISBN:
Category : Dendrochronology
Languages : en
Pages : 118
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Author:
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ISBN:
Category : Algae
Languages : en
Pages : 182
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Author: Sofia Valenzuela
Publisher: Frontiers Media SA
ISBN: 2889742024
Category : Science
Languages : en
Pages : 295
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
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Anthropogenic climate change in the western U.S. involves increasing temperatures, decreasing water availability and increasing frequency of extreme weather events. Predicting how subalpine forests will respond to climate change is complicated by variation in intraspecific responses. To address the question of whether subalpine tree populations will be able to tolerate future climatic conditions within their current distribution, I compared the physiological, phenological and morphological response of seedlings of two limber pine (Pinus flexilis James) mitochondrial haplotypes (narrow and wide-ranging) to simulated climate change. I conducted a 15-week growth chamber experiment on seedlings under low light conditions and two temperature treatments: ambient (recent climate conditions) and heated (ambient +5°C). I recorded the timing of developmental stages and measured seedling net photosynthetic and dark respiration rates, total biomass, root to shoot mass and length, specific leaf area (SLA) and specific root length (SRL). I found that the ambient chamber had greater average rates of net photosynthesis and dark respiration. Between haplotypes, there was a marginally significant difference in net photosynthesis and a significant difference in dark respiration. There were significant morphological differences between the haplotypes and chambers in root to shoot mass and SLA. Seedlings in the heated chamber germinated, on average, two weeks earlier than in the heated chamber and experienced a five-fold increase in mortality rate. The results of this experiment suggests that limber pine seedlings growing in the shade in a 5°C warmer climate will suffer near zero carbon balance, increased mortality, and will experience a longer growing season.
