Performance Of The Seaprog Prognosis Variant Of The Forest Vegetation Simulator PDF Download

Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Performance Of The Seaprog Prognosis Variant Of The Forest Vegetation Simulator PDF full book. Access full book title Performance Of The Seaprog Prognosis Variant Of The Forest Vegetation Simulator.

Performance of the SEAPROG Prognosis Variant of the Forest Vegetation Simulator

Performance of the SEAPROG Prognosis Variant of the Forest Vegetation Simulator
Author: Michael H. McClellan
Publisher:
Total Pages: 24
Release: 2003
Genre: Forest management
ISBN:

Download Performance of the SEAPROG Prognosis Variant of the Forest Vegetation Simulator Book in PDF, ePub and Kindle

This paper reports the first phase of a recent effort to evaluate the performance and use of the FVS-SEAPROG vegetation growth model. In this paper, we present our evaluation of SEAPROG's performance in modeling the growth of even-aged stands regenerated by clearcutting, windthrow, or fire. We evaluated the model by comparing model predictions to observed values from two sets of long-term permanent plots. We examined six variables: trees per acre, quadratic mean diameter, basal area per acre, height of the largest 40 trees per acre, cubic-foot volume per acre, and board-foot volume per acre. The differences between observed and predicted values were large enough to have important implications for the interpretation and use of the model's predictions. Of even greater importance was the evidence for considerable bias in quadratic mean diameter, basal area, height, and volume, all of which were systematically underestimated. Our results appear to validate the concerns expressed by users.


Research Paper PNW.

Research Paper PNW.
Author:
Publisher:
Total Pages: 372
Release: 1978
Genre: Forests and forestry
ISBN:

Download Research Paper PNW. Book in PDF, ePub and Kindle


Synthesis on the Literature on the Biology, Ecology, and Management of Western Hemlock Dwarf Mistletoe

Synthesis on the Literature on the Biology, Ecology, and Management of Western Hemlock Dwarf Mistletoe
Author: John A. Muir
Publisher: DIANE Publishing
Total Pages: 142
Release: 2008-10-01
Genre:
ISBN: 1437906559

Download Synthesis on the Literature on the Biology, Ecology, and Management of Western Hemlock Dwarf Mistletoe Book in PDF, ePub and Kindle

Hemlock dwarf mistletoe (HDM) (¿Arceuthobium tsugense¿) is a small, inconspicuous parasite that has significant effects on tree growth and stand structure in coastal forest ecosystems of west. N. Amer. Previous clearcut harvesting of areas that removed all infected trees, and forestry practices that established even-aged stands of trees effectively prevented HDM impacts. However, current forest practices that restrict clearcut harvesting to small openings, and retain live trees to preserve attributes of old-growth forests create conditions that are favorable for enhanced seed production by HDM, early spread of the HDM to infect young trees, and, increased growth impacts to residual trees. More info. is needed on the biology and impacts of HDM. Illustrations.


Climate and Environmental Change in the Mediterranean Basin – Current Situation and Risks for the Future. First Mediterranean Assessment Report

Climate and Environmental Change in the Mediterranean Basin – Current Situation and Risks for the Future. First Mediterranean Assessment Report
Author: Mediterranean Experts on Climate and environmental Change (MedECC)
Publisher: MedECC
Total Pages: 632
Release: 2020-11-17
Genre: Science
ISBN: 2957741601

Download Climate and Environmental Change in the Mediterranean Basin – Current Situation and Risks for the Future. First Mediterranean Assessment Report Book in PDF, ePub and Kindle

The First Mediterranean Assessment Report (MAR1) prepared by the independent network of Mediterranean Experts on Climate and environmental Change (MedECC) founded in 2015 was published in November 2020. MAR1 assesses the best available scientific knowledge on climate and environmental change and associated risks in the Mediterranean Basin in order to render it accessible to policymakers, stakeholders and citizens. The report has been written by 190 scientists from 25 countries, all contributing in individual capacity and without financial compensation. The report includes a Summary for Policymakers (SPM), which comprises the key messages of the MAR1. The UNEP/MAP – Barcelona Convention Secretariat, through its Plan Bleu Regional Activity Center, and the Secretariat of the Union for the Mediterranean work in partnership to support MedECC, and to contribute to establish a sound and transparent scientific assessment process.


Modeling and Practice of Erosion and Sediment Transport under Change

Modeling and Practice of Erosion and Sediment Transport under Change
Author: Mohamed Meddi
Publisher: MDPI
Total Pages: 212
Release: 2019-09-17
Genre: Technology & Engineering
ISBN: 3039214314

Download Modeling and Practice of Erosion and Sediment Transport under Change Book in PDF, ePub and Kindle

Climate and anthropogenic changes impact the conditions of erosion and sediment transport in rivers. Rainfall variability and, in many places, the increase of rainfall intensity have a direct impact on rainfall erosivity. Increasing changes in demography have led to the acceleration of land cover changes in natural areas, as well as in cultivated areas, and, sometimes, in degraded areas and desertified landscapes. These anthropogenized landscapes are more sensitive to erosion. On the other hand, the increase in the number of dams in watersheds traps a great portion of sediment fluxes, which do not reach the sea in the same amount, nor at the same quality, with consequences on coastal geomorphodynamics. This book is dedicated to studies on sediment fluxes from continental areas to coastal areas, as well as observation, modeling, and impact analysis at different scales from watershed slopes to the outputs of large river basins. This book is concentrated on a number of keywords: “erosion” and “sediment transport”, “model” and “practice”, and “change”. The keywords are briefly discussed with respect to the relevant literature. The contributions in this book address observations and models based on laboratory and field data, allowing researchers to make use of such resources in practice under changing conditions.


Long Island Sound

Long Island Sound
Author: James S. Latimer
Publisher: Springer Science & Business Media
Total Pages: 576
Release: 2013-11-22
Genre: Science
ISBN: 146146126X

Download Long Island Sound Book in PDF, ePub and Kindle

The U.S. Ocean Commission Report identified the need for regional ecosystem assessments to support coastal and ocean management. These assessments must provide greater understanding of physical and biological dynamics than assessments at global and national scales can provide but transcend state and local interests. This need and timeliness is apparent for Long Island Sound, where a multi-state regional restoration program is underway for America’s most urbanized estuary. Synthesis of the Long Island Sound ecosystem is needed to integrate knowledge across disciplines and provide insight into understanding and managing pressing issues, such as non-point sources of pollution, coastal development, global climatic change, and invasive species. Currently, there is a need for a comprehensive volume that summarizes the ecological and environmental dynamics and status of Long Island Sound and its myriad ecosystems. It has been 30 years since a comprehensive summary of Long Island Sound was prepared and 50 years since the pioneering work of Gordon Riley. Major advances in estuarine science are providing new insights into these systems, and yet, the condition of many estuaries is in decline in the face of continuing coastal development. There is an opportunity to lay a foundation for integrative coastal observing systems that truly provide the foundation for improved decision-making. This book will provide a key reference of our scientific understanding for work performed over the past three decades and guide future research and monitoring in a dynamic urbanized estuary.


Evolution of Marine Coastal Ecosystems under the Pressure of Global Changes

Evolution of Marine Coastal Ecosystems under the Pressure of Global Changes
Author: Hubert-Jean Ceccaldi
Publisher: Springer Nature
Total Pages: 521
Release: 2020-06-15
Genre: Science
ISBN: 3030434842

Download Evolution of Marine Coastal Ecosystems under the Pressure of Global Changes Book in PDF, ePub and Kindle

Coastal and estuarine environments at the interface of terrestrial and marine areas are among the most productive in the world. However, since the beginning of the industrial era, these ecosystems have been subjected to strong anthropogenic pressures intensified from the second half of the 20th century, when there was a marked acceleration in the warming (climate change) of the continents, particularly at high latitudes. Coastal ecosystems are highly vulnerable to alteration of their physical, chemical and biological characteristics (marine intrusion, acidification of marine environments, changes in ecosystems, evolution and artificialization of the coastline, etc.).In contact with heavily populated areas, these environments are often the receptacle of a lot of chemical and biological pollution sources that significantly diminish their resilience. In this context of accelerated evolution and degradation of these areas important for food security of many populations around the world, it is necessary to better identify the factors of pressure and understand, at different scales of observation, their effects and impacts on the biodiversity and on the socio-eco-systems, in order to determine the degree of vulnerability of these coastal ecosystems and the risks they face. A transdisciplinary and integrated approach is required to prevent risks. Within this framework, operational coastal oceanography occupies an important place but also the implementation of a true socio-eco-system approach in order to set up an environmentally friendly development.