نتایج جستجو برای: physiographic factors

تعداد نتایج: 1078537  

Physiographic factors, due to their special role in determining some climatic and edaphic parameters, always influence the diversity and richness of plant species. Due to the importance of Arasbaran vegetation area, the present study was conducted to investigate the biodiversity of woody species of Kalaleh yew habitat in relation to physiographic factors. For this purpose, 62 plots of 4 square ...

2012
N.

The Cainozoic history of the Malanna area included faulting, deposition of sediments by streams or in lakes and swamps, two epochs of planation, and stream erosion. There is no physiographic, depositional or structural evidence for gladation in this area, the type area of Lewis's Malanna Phase of the Pleistocene glaciation. This phase must be considered invalid on the eviaence available in the ...

Journal: : 2022

سابقه و هدف: جنگل­ های زاگرس به ­عنوان یکی از بوم ­سازگان­ جنگلی مهم ایران پوشش­ گیاهی (درختان، درختچه ­ها گونه­ علفی) متنوعی برخوردار می­ باشد. شناسایی آگاهی دقیق نقش ­شناختی آنها در این ­سازگان تواند حفاظت منابع طبیعی توسعه پایدار کمک شایانی نماید. به‌منظور مطالعه تنوع گونه‌ای گیاهان چوبی ذخیره کربن خاک رابطه با عوامل فیزیوگرافیک (جهت، شیب ارتفاع سطح دریا)، رویشگاه کیکم (var. cinerascens Acer...

2003
Eric J. Fielding Andrew N. Fox E. J. Fielding

Acquisition of nearly complete coverage of Thematic Mapper data for the central Andes between about 15’s to 34’s has stimulated a comprehensive and unprecedented study of the interaction of tectonics and climate in a young and actively developing major continental mountain belt. The paper briefly reviews the current state of our synoptic mapping of key physiographic, tectonic and climatic indic...

2013
J Bendix

In this chapter, we review the historical arc of research on biogeomorphic interactions between fluvial geomorphology and riparian vegetation. We then report on an examination of the past 20 years of published research on this topic. Having classified studies according to the key relationships they have identified, we map those relationships to seek spatial patterns that emerge in terms of eith...

Journal: :Vector borne and zoonotic diseases 2009
J Jeffrey Root Robert B Puskas Justin W Fischer Craig B Swope Melissa A Neubaum Serena A Reeder Antoinette J Piaggio

Raccoons are the reservoir for the raccoon rabies virus variant in the United States. To combat this threat, oral rabies vaccination (ORV) programs are conducted in many eastern states. To aid in these efforts, the genetic structure of raccoons (Procyon lotor) was assessed in southwestern Pennsylvania to determine if select geographic features (i.e., ridges and valleys) serve as corridors or hi...

Journal: :Quaternary 2023

Pollen and sediment data from a 10.5 m-deep alluvial exposure secondary tributary at Upper Arroyo, seasonal river, in Saltillo, Mexico, were examined with the aim of reconstructing vegetation environmental history during Holocene as whole. The role climate change Chihuahuan Desert flora development after 8800 BP was assessed, addition to more local physiographic factors, such erosion accumulati...

2003
Peter L. GUTH P. L. GUTH

Digital elevation models (DEMs) cover a wide range of scales, and allow statisticalanalysis of geomorphometric parameters. At global or continental scale, DEMs covering rectangular quadrangles can be considered random samples. Average quadrangle values can be compared at different DEM scales, and for different physiographic provinces. Three independent variables provide valuable descriptions of...

2016
Carolyn A. Copenheaver Tara L. Keyser

We hypothesized that tree form, recorded in historical public land surveys, would provide a valuable proxy record of regeneration patterns during early-European settlement of North America's eastern deciduous forest. To test this hypothesis, we tallied stem form fromwitness trees used in land survey records in the southern Appalachian Mountains from 13 counties spanning four physiographic provi...

2007
Lewis Jordan Alexander Clark

The effect of physiographic region on microfibril angle (MFA) in loblolly pine (Pinus taeda L.) ia the southern United States was evaluated. MFA was determined at 1.4,4.6,7.6, 10.7, and 13.7 m up the stem of 59 trees, representing five physiographic regions. A nonlinear mixadeffects model was developed to test for regional differences in the initial value of MFA, the rate at which MFA changes w...

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