نتایج جستجو برای: astara forest ecosystem

تعداد نتایج: 179070  

2017
Keller Schmid

Aims: Despite the current interest in services provided by ecosystems and the role of biodiversity, the relationship among human attitudes, biodiversity and ecosystem services has hardly been investigated. Moreover, few studies have examined attitudes toward nature in cross-cultural comparisons. This study investigates the attitudes of Chinese and Swiss people, both environmental experts and la...

2009
Ian Thompson Steven McNulty

The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the copyright holders concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. This publication may be reproduced for educational or non-profit purposes...

2006

Regional-scale forest ecosystem models can provide insight into how forest hydrology and productivity differ in response to variations in climate and soil conditions. However, the databases necessary to define and validate these models are difficult to compile and utilize. The use of a Geographic Information System (GIS) can greatly simplify problems in database management. As an example of reg...

Journal: :Remote Sensing 2014
Bruce K. Wylie Matthew Rigge Brian Brisco Kevin Murnaghan Jennifer Rover Jordan Long

A warming climate influences boreal forest productivity, dynamics, and disturbance regimes. We used ecosystem models and 250 m satellite Normalized Difference Vegetation Index (NDVI) data averaged over the growing season (GSN) to model current, and estimate future, ecosystem performance. We modeled Expected Ecosystem Performance (EEP), or anticipated productivity, in undisturbed stands over the...

2001
Rosimeiry Portela Ida Rademacher

This paper presents a dynamic systems model that shows how different land use patterns degrade the value of ecosystem services provided by the Brazilian Amazonia. The model consists of four sectors: (1) deforestation drivers; (2) land use/cover; (3) ecosystem services; and (4) ecosystem valuation. The deforestation drivers sector models the economic and social incentives that small farmers and ...

2012
Nicole C. Bouvier-Brown Gunnar W. Schade Laurent Misson Anita Lee Megan McKay Allen H. Goldstein

When assessing net ecosystem exchange (NEE) and net ecosystem carbon balance (NECB), respiration is generally assumed to be the only significant loss of carbon to the atmosphere. However, carbon is also emitted from ecosystems in the form of biogenic volatile organic compounds (BVOCs). Here we consider the magnitude of systematic difference caused by omitting this additional carbon loss from th...

نادری, مصطفی, جعفرزاده, علی‌اکبر , حیدری, مهدی, کریمی‌کیا, حمدیه,

The key factor in understanding the forest ecosystems is forest structure. Spatial arrangement and location of trees are both one of the main components of forest stand structure. This study was carried out in Manesht protected area, Ilam province. In order to determine the ecological groups and spatial patterns of indicator species, we used fixed-area plots method. For data collection, 125 squ...

2012
Jeffrey D. Kline Marisa J. Mazzotta Tom Iraci

Kline, Jeffrey D.; Mazzotta, Marisa J. 2012. Evaluating tradeoffs among ecosystem services in the management of public lands. Gen. Tech. Rep. PNWGTR-865. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 48 p. The U.S. Forest Service has adopted the concept and language of ecosystem services to describe the beneficial outcomes of national forest m...

2007
Brenden E. McNeil Kirsten M. de Beurs Keith N. Eshleman Jane R. Foster Philip A. Townsend

[1] Ephemeral disturbances, such as non-lethal insect defoliations and crown damage from meteorological events, can significantly affect the delivery of ecosystem services by helping maintain nitrogen (N) limitation in temperate forest ecosystems. However, the impacts of these disturbances are difficult to observe across the broad-scales at which they affect ecosystem function. Using remotely s...

2013
Dominic A Andradi-Brown Caroline Howe Georgina M Mace Andrew T Knight

Background: Mangrove forest restoration and rehabilitation programs are increasingly undertaken to re-establish ecosystem services in the context of community-based biodiversity conservation. Restoration is returning a habitat to the most natural condition, whereas rehabilitation often focuses on optimising ecosystem services alongside biodiversity. With many different restoration and rehabilit...

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