نتایج جستجو برای: treefall gaps

تعداد نتایج: 53577  

2017
Nathan P. Lemoine Deron E. Burkepile John D. Parker

Insect herbivores help maintain forest diversity through selective predation on seedlings of vulnerable tree species. Although the role of natural enemies has been well-studied in tropical systems, relatively few studies have experimentally manipulated insect abundance in temperate forests and tracked impacts over multiple years. We conducted a three-year experiment (2012-2014) deterring insect...

2008
J. - C. SvENNiNG D. A. KiNNER R. F. STALLARD B. M. J. ENGELBRECHT S. J. WRIGHT

The ecological mechanisms hypothesized to structure species-rich communities range from strict local determinism to neutral ecological drift. We assessed the degree of ecological determinism in tropical plant community structure by analyses of published demographic data; a broad range of spatial, historical, and environmental variables; and the distributions of 33 herbaceous species (plot size ...

Journal: :Iforest - Biogeosciences and Forestry 2021

Natural treefall gaps have a substantial role in maintaining soil and plant diversity old-growth forests. However, the amount of information on effects recovery physical chemical properties compacted soils is scarce. We tested hypothesis that natural accelerate restoration by enhancing biological microbial activity topsoil after period five years. Five years ground-based skidding operation Hyrc...

2007
Daniel G. Wenny

Postdispersal fate of seeds from Ocotea endresiana (Lauraceae), a bird-dispersed Neotropical montane tree, was studied in Costa Rica to determine the influence of seed dispersers, seed predators, and microhabitat characteristics on seedling recruitment. Particular emphasis was placed on finding naturally dispersed seeds in order to study the link between dispersal and postdispersal fate of seed...

2012
Stefan A. Schnitzer Scott A. Mangan James W. Dalling Claire A. Baldeck Stephen P. Hubbell Alicia Ledo Helene Muller-Landau Michael F. Tobin Salomon Aguilar David Brassfield Andres Hernandez Suzanne Lao Rolando Perez Oldemar Valdes Suzanne Rutishauser Yorke

Lianas are a key component of tropical forests; however, most surveys are too small to accurately quantify liana community composition, diversity, abundance, and spatial distribution - critical components for measuring the contribution of lianas to forest processes. In 2007, we tagged, mapped, measured the diameter, and identified all lianas ≥1 cm rooted in a 50-ha plot on Barro Colorado Island...

2005
Eric S. Menges Pedro F. Quintana Ascencio Carl W. Weekley Orou G. Gaoue

We use population viability analysis of an endangered Florida scrub mint, Dicerandra frutescens, to specify the optimal fire return intervals for its long-term persistence and for its specific habitat. We derived 83 population projection matrices from 13 years of demographic data from eight populations, 59 matrices from scrub populations and 24 from firelane or yard edges. Seed dormancy and ger...

2018
Per Holm Nygaard Line Tau Strand Arne Oddvar Stuanes

Stand dynamics and the gap initiation prior to gap formation are not well-understood because of its long-term nature and the scarcity of late-successional stands. Reconstruction of such disturbance is normally based on historical records and dendroecological methods. We investigated gap initiation and formation at the fine-scale stand level in the old-growth reserve of Karlshaugen in Norway. Gi...

Journal: :Atmosphere 2021

Roll vortices are frequent features of a hurricane’s boundary layer, with kilometer or sub-kilometer horizontal scale. In this study, we found that large roll O (10 km) wavelength occurred over land in Post-Tropical Cyclone Sandy (2012) during landfall on New Jersey. Various characteristics were corroborated by analyses Doppler radar observations, 500 m resolution Weather Research and Forecasti...

<p</pThis study was conducted to compare regeneration density and biodiversity indices in the natural and man-made gaps in the Tutaki forests of Siahkal in Gilan province. Data were collected from 60 gaps (including 30 natural and 30 man-made gaps). The results of species composition indicated that three tree species including Diospyros lotus L., Carpinus betulus L. and Alnus glutinosa L. in bo...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید