نتایج جستجو برای: plants cover composition

تعداد نتایج: 551987  

2016
Inger Greve Alsos Dorothee Ehrich Marit-Solveig Seidenkrantz Ole Bennike Andreas Joachim Kirchhefer Aslaug Geirsdottir

Sea ice has been suggested to be an important factor for dispersal of vascular plants in the Arctic. To assess its role for postglacial colonization in the North Atlantic region, we compiled data on the first Late Glacial to Holocene occurrence of vascular plant species in East Greenland, Iceland, the Faroe Islands and Svalbard. For each record, we reconstructed likely past dispersal events usi...

2009
Kyle E. Harms Jennifer S. Powers Rebecca A. Montgomery

Even though many forest plants spend all or a significant portion of their lives in the forest understory, few studies have compared understory composition, structure, and resource availability among forests. We used standardized transect-based methods to compare small sapling densities (10•50 cm tall), understory vegetation cover, canopy openness, and nutrient availability in non-gap portions ...

2004
Kyle E. Harms

Even though many forest plants spend all or a significant portion of their lives in the forest understory, few studies have compared understory composition, structure, and resource availability among forests. We used standardized transect-based methods to compare small sapling densities (10–50 cm tall), understory vegetation cover, canopy openness, and nutrient availability in non-gap portions ...

2011
Munesh Kumar Mehraj A Sheikh Rainer W Bussmann

BACKGROUND The northern part of India harbours a great diversity of medicinal plants due to its distinct geography and ecological marginal conditions. The traditional medical systems of northern India are part of a time tested culture and honored still by people today. These traditional systems have been curing complex disease for more than 3,000 years. With rapidly growing demand for these med...

Journal: Desert 2016

Green space is one of the important infrastructures for keeping natural life and sustainability in modern urbanism and it provides excellent recreational opportunities for the people in the society. However, there are limiting factors in green space development, especially in arid regions, including extreme weather and soil temperatures, low average rainfall, drought, and high potential for eva...

Ali Mahamane Ambouta J.M. Karimou Boubacar M. Moussa Mahamane Saadou SOUMANA Idrissa, Youssoufa Issiaka

Description of vegetation patterns associated with environmental factors such as grazing, climate, landforms, substrate variables etc. are helpful for land management planning. This study used new synecological tools to investigate plants composition and to provide ecological descriptions of plants communities of communal pastures in Sahelian Ecological Zone of Niger. Vegetation and several env...

Journal: :Ecology 2010
Laura M Ladwig Scott J Meiners

Although they are important components of forest communities, the general ecology and spatiotemporal patterns of temperate lianas during forest regeneration are largely unknown. The dependence of lianas on other plants for physical support makes them a potentially important driver of community dynamics. We examined 50 years of vegetation data from an old-field succession study to determine the ...

2011
WenJun Zhang

The relationship between arthropod abundance and plant composition is extremely complex. It is very hard to develop a mechanistic model to describe the relationship. This study aimed to simulate arthropod abundance from plant composition on grassland using an artificial neural network developed by the author, and to compare simulation performances between the neural network and conventional mod...

2009
Adena R. Rissman Sarah E. Reed Chuck Hughes Richard Reiner

Conservation easements are an increasingly popular strategy for conserving biological diversity on private land. Long-term vegetation monitoring on conservation easements can provide critical information on persistence of biological diversity and abundance of invasive species. We sampled understory plant composition on five of The Nature Conservancy’s conservation easements in the Mt. Lassen fo...

2013
M. D. Ohman T. K. Kratz

Climate (the average and variability of weather conditions over a period of time) is a primary driver of ecological systems. Important climate and climaterelated factors for ecosystems include precipitation, air and water temperature, ice cover duration, sea level, stream flow, solar radiation, and water clarity. These factors affect resources available to plants, animals, and microbes and act ...

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