نتایج جستجو برای: forest typology changing

تعداد نتایج: 260569  

Journal: :جنگل و فرآورده های چوب 0
بیت الله محمودی استادیار گروه جنگلداری دانشکدة منابع طبیعی و علوم زمین دانشگاه شهرکرد، شهرکرد، ایران احمد بازگیر دانشجوی دکتری جنگلداری دانشکدة کشاورزی دانشگاه لرستان، خرم آباد، ایران جهانگیر فقهی دانشیار گروه جنگلداری و اقتصاد جنگل دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران فاطمه جعفری کارشناس ارشد مدیریت کشاورزی دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران

one of the indicators of management and sustainability control of forest resources is the definition deforestation and degradation types. these factors hazard quantitative and qualitative of the iranian forests. in this study with integrated approach, different forms of forest degradation identified in the forest areas with a reviews of library resources and then investigation the degree of sta...

1997
Neil Byron Michael Arnold

The importance of forest products to the households who live in or close to the forests has been increasingly recognised over the past ten years. The numbers of people who in some way rely on the forest for survival or livelihood inputs is difficult to assess, and estimates vary widely. The authors of this paper argue that these are not the most appropriate measures of the importance of forests...

2017
Jennifer K Costanza John W Coulston David N Wear

The composition of tree species occurring in a forest is important and can be affected by global change drivers such as climate change. To inform assessment and projection of global change impacts at broad extents, we used hierarchical cluster analysis and over 120,000 recent forest inventory plots to empirically define forest tree assemblages across the U.S., and identified the indicator and d...

2001
UNNA CHOKKALINGAM

With past and continued destruction of primary forests worldwide, secondary forests constitute a large and growing component of forest cover and have been found to be very important for a wide range of goods and services.” There is considerable ambiguity with regard to the meaning of the term “secondary forest” and the different forest types it encompasses, despite its widespread usage. This pa...

2009
lexander Pfaff Robert Walker

Using case studies and concepts we suggest that constraints upon aggregate or global forest transition are significantly more severe than those upon local forest reversals. The basic reason is that one region’s reversal can be facilitated by other regions that supply resources and goods, reducing the demands upon the region where forests rise. Many past forest reversals involve such interdepend...

Journal: :Journalism: Theory, Practice & Criticism 2022

The past few decades of journalism studies have been characterized by a focus on change, from the transforming digital media ecology, to shifting usage patterns, transitioning business models, and other pressing developments. However, specifying such changes in relation news audiences engagement is challenging. This article aims unfold complexity consumption specify different processes changing...

Ebadi, Hamid, Hosseini, Samira, Maghsoudi, Yaser,

Estimation of forest biomass has received much attention in recent decades. Airborne and spaceborne (SAR) have a great potential to quantify biomass and structural diversity because of its penetration capability. Polarizations are important elements in SAR systems due to sensitivity of them to backscattering mechanisms and can be useful to estimate biomass. Full Polarimetric Synthetic Aperture ...

Journal: :Journal of the Japanese Institute of Landscape Architects 1966

Journal: :Philosophical Transactions of the Royal Society B: Biological Sciences 2008
Oliver L Phillips Simon L Lewis Timothy R Baker Kuo-Jung Chao Niro Higuchi

Long-term monitoring of distributed, multiple plots is the key to quantify macroecological patterns and changes. Here we examine the evidence for concerted changes in the structure, dynamics and composition of old-growth Amazonian forests in the late twentieth century. In the 1980s and 1990s, mature forests gained biomass and underwent accelerated growth and dynamics, all consistent with a wide...

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