نتایج جستجو برای: lands areas

تعداد نتایج: 409535  

Journal: :Current Investigations in Agriculture and Current Research 2018

2016
J. Tatarko S.J. van Donk J.C. Ascough D.G. Walker

Wind erosion not only affects agricultural productivity but also soil, air, and water quality. Dust and specifically particulate matter ≤10 μm (PM-10) has adverse effects on respiratory health and also reduces visibility along roadways, resulting in auto accidents. The Wind Erosion Prediction System (WEPS) was developed by the USDA-Agricultural Research Service to simulate wind erosion and prov...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2010
Matthew E Herbert Peter B McIntyre Patrick J Doran J David Allan Robin Abell

Protected areas are a cornerstone of conservation and have been designed largely around terrestrial features. Freshwater species and ecosystems are highly imperiled, but the effectiveness of existing protected areas in representing freshwater features is poorly known. Using the inland waters of Michigan as a test case, we quantified the coverage of four key freshwater features (wetlands, ripari...

2010
Jason R. Janke

The majority of electricity and heat in Colorado comes from coal and natural gas; however, renewable energy sources will play an integral role in the state’s energy future. Colorado is the 11th windiest state and has more than 250 sunny days per year. The objectives of this research are to: 1) determine which landcover classes are affiliated with high wind and solar potential; and 2) identify a...

Journal: :Environmental pollution 2002
G E Schuma H H Janzen J E Herrick

The USA has about 336 Mha of grazing lands of which rangelands account for 48%. Changes in rangeland soil C can occur in response to a wide range of management and environmental factors. Grazing, fire, and fertilization have been shown to affect soil C storage in rangelands, as has converting marginal croplands into grasslands. Carbon losses due to soil erosion can influence soil C storage on r...

Journal: :Journal of environmental management 2009
Roger B Hammer Susan I Stewart Todd J Hawbaker Volker C Radeloff

Rural, forested areas throughout the United States are experiencing strong housing growth with potentially detrimental impacts on the environment. In this paper, we quantify housing growth in Northern Wisconsin over the last sixty years to determine if growth rates were higher near public lands, which may represent an important recreational amenity. We used data from the U.S. Census to produce ...

2006
Thando D. Gwebu

Studies on spatial fertility differentials in sub-Sahara Africa normally treat the rural sector as a single and uniform geographical entity. This approach, unfortunately, tends to mask differences, which may exist between components of the rural sub-sectors. This empirical study, based on both quantitative analyses and participatory methodologies, has stratified one rural district in southweste...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Thomas K Rudel Laura Schneider Maria Uriarte B L Turner Ruth DeFries Deborah Lawrence Jacqueline Geoghegan Susanna Hecht Amy Ickowitz Eric F Lambin Trevor Birkenholtz Sandra Baptista Ricardo Grau

Does the intensification of agriculture reduce cultivated areas and, in so doing, spare some lands by concentrating production on other lands? Such sparing is important for many reasons, among them the enhanced abilities of released lands to sequester carbon and provide other environmental services. Difficulties measuring the extent of spared land make it impossible to investigate fully the hyp...

Journal: :The Southeast Asian journal of tropical medicine and public health 1994
C M Seng N Jute

An Aedes survey using various larval survey methods was conducted in 12 urban housing areas and 29 vacant lands in Sibu town proper. Aedes albopictus larvae were found in all areas surveyed while Aedes aegypti larvae were present in 10 localities and 4 vacant lands. There were no significant difference in the house index, breteau and larval density index of these two Aedes (Stegomyia) species f...

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