نتایج جستجو برای: forest protection

تعداد نتایج: 282990  

2004
Thomas P. Holmes Kevin J. Boyle

The valuation methods described in this chapter are based on the idea that forest ecosystems produce a wide variety of goods and services that are valued by people. Rather than focusing attention on the holistic value of forest ecosystems as is done in contingent valuation studies, attribute-based valuation methods (ABMs) focus attention on a set of attributes that have management or policy rel...

2017
Murray B. Collins Edward T. A. Mitchard

Protected areas (PAs) aim to protect multiple ecosystem services. However, not all are well protected. For the first time, using published carbon and forest loss maps, we estimate carbon emissions in large forest PAs in tropical countries (N = 2018). We found 36 ± 16 Pg C stored in PA trees, representing 14.5% of all tropical forest biomass carbon. However the PAs lost forest at a mean rate of ...

2013
Joseph A. M. Smith

Many sea level rise adaptation plans emphasize the protection of adjacent uplands to allow for inland salt marsh migration, but little empirical information exists on this process. Using aerial photos from 1930 and 2006 of Delaware Estuary coastal habitats in New Jersey, I documented the rate of coastal forest retreat and the rate of inland salt marsh migration across 101.1 km of undeveloped sa...

2008
Keqi Zhang Marc Simard Michael Ross Victor H. Rivera-Monroy Patricia Houle Pablo Ruiz Robert R. Twilley Kevin R. T. Whelan

Airborne light detection and ranging (LIDAR) measurements derived before and after Hurricanes Katrina and Wilma (2005) were used to quantify the impact of hurricanes and lightning strikes on the mangrove forest at two sites in Everglades National Park (ENP). Analysis of LIDAR measurements covering 61 and 68 ha areas of mangrove forest at the Shark River and Broad River sites showed that the pro...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2008
Lucas N Joppa Scott R Loarie Stuart L Pimm

Tropical moist forests contain the majority of terrestrial species. Human actions destroy between 1 and 2 million km(2) of such forests per decade, with concomitant carbon release into the atmosphere. Within these forests, protected areas are the principle defense against forest loss and species extinctions. Four regions-the Amazon, Congo, South American Atlantic Coast, and West Africa-once con...

2002
Mats Nilsson

The use of satellite data in forest inventories makes it possible to do a wall-to-wall mapping of forest variables. This type of raster databases with estimated forest variables provides a great potential for planning how the forest resources should be utilized, and can be used as input ecological models. There are different remote sensing methods that can be used to map forest resources. One i...

2008
Qiao Yuliang

This study applies remote sensing technology combined with Markov Process to monitor and forecast the dynamic change of forest resource in Chinese Loess Plateau. At first, according to the dynamic change maps of the forest resource from remote sensing data in three different phases–1978、1987 and 2000, the transitions among the forest resource types in the Daning County ---a key pilot area of “ ...

Journal: :Ambio 2008
Thomas J Brandeis Christopher W Woodall

Quantification of the downed woody materials that comprise forest fuels has gained importance in Caribbean forest ecosystems due to the increasing incidence and severity of wildfires on island ecosystems. Because large-scale assessments of forest fuels have rarely been conducted for these ecosystems, forest fuels were assessed at 121 US Department of Agriculture forest service inventory plots o...

2016

Conservation of forest genetic resources has always been an integral part of tree improvement programs. However threats to FGR, such as habitat destruction, fragmentation, pollution, the use of low quality forest reproductive material and climate change have increased in the past decades and with it the need to maintain FGR. During the past two decades several policy instruments and initiatives...

2015
Dávid Bogyó Tibor Magura Dávid D. Nagy Béla Tóthmérész

We studied the distribution of millipedes in a forest interior-forest edge-grassland habitat complex in the Hajdúság Landscape Protection Area (NE Hungary). The habitat types were as follows: (1) lowland oak forest, (2) forest edge with increased ground vegetation and shrub cover, and (3) mesophilous grassland. We collected millipedes by litter and soil sifting. There were overall 30 sifted lit...

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