نتایج جستجو برای: sustainable forest management in caspian forests of iran requires cost

تعداد نتایج: 24523476  

2015
Matteo Vizzarri Roberto Tognetti Marco Marchetti Eric J. Jokela

Although forest ecosystems are fundamental sources of services and global biodiversity, their capacity to maintain these benefits in the future is potentially threatened by anthropogenic impacts such as climate change, land use, and unsustainable management practices. Thus far, studies focusing on forests and their services have gained less attention compared with studies on other biomes. Addit...

Oak decline as one of the most important environmental problems of Zagros forests, requires proper management to decrease trees dieback and mitigate its effects. This study aimed to find the best sampling method for estimating density and crown canopy of declined oak trees in Zagros Forests. All declined trees in an area of 100 ha of Dinarkooh protected forest were surveyed and trees density, g...

2013
Verena Rieser Derek T. Robinson Dave Murray-Rust Mark Rounsevell

Sustainable forest management is defined as “the stewardship and use of forests and forest lands in a way, and at a rate, that maintains their biodiversity, productivity, regeneration capacity, vitality and their potential to fulfil, now and in the future, relevant ecological, economic and social functions [...].” (MCPFE, 1994). As such, forest management has to satisfy multiple and often confl...

Aboulghasem Yousefi Leila Darvishi

Increasing urbanisation and industrialisation have led to a dramatic reduction in forest area, and now only culturally protected remnants of natural forests and some new plantations remain in most areas of the north of Iran. To investigate the status of the chemical and physical characteristics of soil under these remnant forests and assess the possible impacts of reforestation on soil properti...

2010
Michael Köhl Rüdiger Hildebrandt Konstantin Olschofksy Raul Köhler Thomas Rötzer Tobias Mette Hans Pretzsch Margret Köthke Matthias Dieter Mengistu Abiy Franz Makeschin Bernhard Kenter

BACKGROUND Forests occur across diverse biomes, each of which shows a specific composition of plant communities associated with the particular climate regimes. Predicted future climate change will have impacts on the vulnerability and productivity of forests; in some regions higher temperatures will extend the growing season and thus improve forest productivity, while changed annual precipitati...

Journal: :Nature communications 2016
Nico Blüthgen Nadja K Simons Kirsten Jung Daniel Prati Swen C Renner Steffen Boch Markus Fischer Norbert Hölzel Valentin H Klaus Till Kleinebecker Marco Tschapka Wolfgang W Weisser Martin M Gossner

Human land use may detrimentally affect biodiversity, yet long-term stability of species communities is vital for maintaining ecosystem functioning. Community stability can be achieved by higher species diversity (portfolio effect), higher asynchrony across species (insurance hypothesis) and higher abundance of populations. However, the relative importance of these stabilizing pathways and whet...

2013
Eli S. Sagor Amanda M. Kueper Charles R. Blinn Dennis R. Becker

Landowner education is the foundation of a broad suite of public investments designed to encourage sustainable forest management. Extension Forestry programs are the primary providers of landowner education in the United States. We report the results of a census of the 50 state-level Extension Forestry Program Leaders on status, trends, and innovations in their programs. These programs employ 2...

Journal: :تحقیقات جنگل و صنوبر ایران 0
عیسی انیسی کارشناس ارشد جنگل داری، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران هادی کیادلیری استادیار، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران رضا اخوان استادیار پژوهش، موسسه تحقیقات جنگلها و مراتع کشور ساسان بابایی کفاکی استادیار، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران

this study was performed in order to consider the effect of management plans on forest, through comparison between qualitative and quantitative characteristics of managed and unmanaged forests. compartment no. 149 from shourab district (52.8 ha) and compartment no. 218 from jamand district (68.7 ha) were selected as managed and unmanaged forests, respectively and were inventoried using a system...

2006
Krishna K. Shrestha Phil McManus

Collective action by local communities has increasingly been recognised as crucial for effective management of natural resources, particularly the management of forests in the rural settings. This recognition is principally based on the universal and often unquestioned assumption that the involvement of local communities in the management of forests can improve the forest condition and utilisat...

2008
Paolo Omar Cerutti Robert Nasi Luca Tacconi

One of the main objectives of the 1994 Cameroonian forestry law is to improve the management of production forests by including minimum safeguards for sustainability into compulsory forest management plans. As of 2007, about 3.5 million hectares (60%) of the productive forests are harvested following the prescriptions of 49 approved management plans. The development and implementation of these ...

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