نتایج جستجو برای: forest seed centre of khazar

تعداد نتایج: 21196037  

Journal: :تاکسونومی و بیوسیستماتیک 0
سید غلامعلی جلالی حامد اسدی امید اسماعیل زاده اعظم نورایی حامد اسدی

the purpose of this study was the introduction of seed accumulation index as a new approach in the evaluation of soil seed bank consistency in the populus caspica in noor reserved forest park. sampling were made above ground vegetation at peak vegetation cover during june 2010 by systematic- selective method. soil samples were collected during late june, late november and early february by hamm...

Journal: Desert 2006
M. Baghestani Maybodi N. Baghestani Maybodi, S. Soufizadeh

The high quality and quantity seed production in old saxual shrubs are essential for regeneration and sustainable development of saxual forests in desert areas. The objective of this study was to determine the effects of different pruning height on saxual seed production. The study was carried out in an obviously wilted saxual forest located in Ashkezar desert in Yazd in 1994. The experiment wa...

2005
Scot Duncan Virginia E. Duncan

Forest succession on degraded tropical lands often is slowed by impoverished seed banks and low rates of seed dispersal. Within degraded landscapes, remnant forests are potential seed sources that could enhance nearby forest succession. The spatial extent that forest can influence succession, however, remains largely unstudied. In abandoned agricultural lands in Kibale National Park, Uganda, re...

2015
Kim Valenta Travis S. Steffens Radoniaina R. Rafaliarison Colin A. Chapman Shawn M. Lehman

Rapid deforestation has fragmented habitat across the landscape of Madagascar. To determine the effect of fragmentation on seed banks and the potential for forest regeneration, we sampled seed viability, density and diversity in 40 plots of 1 m in three habitat types: forest fragments, the near edge of continuous forest, and deforested savanna in a highly fragmented dry deciduous forest landsca...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2009
S R R Pinto A M M Santos M Tabarelli

Seed predation by small rodents is an emerging theme in the ecology of modified landscapes. Here we investigate the role played by the small rodent Oryzomys oniscus as a seed predator of large-seeded trees in a large remnant of the Atlantic forest - the Coimbra forest (3,500 ha), Alagoas state, northeastern Brazil. O. oniscus was captured and identified by setting twenty 500 m long transects, e...

حجتی, سید محمد, میرزایی زاده, وحید, نیک نژاد, مریم,

In order to map the forest canopy density Bivareh Ilam Landsat 8 satellite data of 22 July 2014 and FCD model was used. The FCD of four indicators of vegetation, soil, shade and the heat index by applying a suitable threshold was and the density of vegetation and forest canopy density map based on FCD in percent respectively. Forest density map obtained, according to the classes provided by the...

2013
V. VIJAYA GEETHA

1 Assistant Professor, Department of Seed Science and Technology, Krishi Vigyan Kendra, TNAU, Vriddhachalam, INDIA 2 Special Officer (Seeds), Seed Centre, TNAU, Coimbatore 641 003, INDIA __________________________________________________________________________________________ Abstract: The main goal of the study is rehabilitation and improving the productivity of land owned by tribals and othe...

2015
James R Smith Robert Bagchi Judith Ellens Chris J Kettle David F R P Burslem Colin R Maycock Eyen Khoo Jaboury Ghazoul

Seed dispersal governs the distribution of plant propagules in the landscape and hence forms the template on which density-dependent processes act. Dispersal is therefore a vital component of many species coexistence and forest dynamics models and is of applied value in understanding forest regeneration. Research on the processes that facilitate forest regeneration and restoration is given furt...

Journal: :Molecular ecology 2017
Juan P González-Varo Carolina S Carvalho Juan M Arroyo Pedro Jordano

Seed dispersal constitutes a pivotal process in an increasingly fragmented world, promoting population connectivity, colonization and range shifts in plants. Unveiling how multiple frugivore species disperse seeds through fragmented landscapes, operating as mobile links, has remained elusive owing to methodological constraints for monitoring seed dispersal events. We combine for the first time ...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2012
Julia S Markl Matthias Schleuning Pierre Michel Forget Pedro Jordano Joanna E Lambert Anna Traveset S Joseph Wright Katrin Böhning-Gaese

Animal-mediated seed dispersal is important for sustaining biological diversity in forest ecosystems, particularly in the tropics. Forest fragmentation, hunting, and selective logging modify forests in myriad ways and their effects on animal-mediated seed dispersal have been examined in many case studies. However, the overall effects of different types of human disturbance on animal-mediated se...

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