نتایج جستجو برای: agricultural land

تعداد نتایج: 204615  

2016
Matthew L. Stone Kristopher Roeske Lathadevi K. Chintapenta Laurieann Phalen Venugopal Kalavacharla Gulnihal Ozbay

Blackbird Creek, Delaware is a small watershed in northern Delaware that has a significant proportion of land designated for agricultural land use. The Blackbird Creek water monitoring program was initiated in 2012 to assess the condition of the watershed’s habitats using multiple measures of water quality. Habitats were identified based on percent adjacent agricultural land use. Study sites va...

2015
Julie G. Zaehringer Peter Messerli Andrew Millington

The north-eastern escarpment of Madagascar harbours the island’s last remaining large-scale humid forest massifs surrounded by a small-scale agricultural mosaic. There is high deforestation, commonly thought to be caused by shifting cultivation practiced by local land users to produce upland rice. However, little is known about the dynamics between forest and shifting cultivation systems at a r...

Journal: :Japanese Journal of Human Geography 1951

Journal: :Ecology 2006
Michael J Vanni Anna M Bowling Elizabeth M Dickman R Scott Hale Karen A Higgins Martin J Horgan Lesley B Knoll William H Renwick Roy A Stein

Animals can be important in nutrient cycling in particular ecosystems, but few studies have examined how this importance varies along environmental gradients. In this study we quantified the nutrient cycling role of an abundant detritivorous fish species, the gizzard shad (Dorosoma cepedianum), in reservoir ecosystems along a gradient of ecosystem productivity. Gizzard shad feed mostly on sedim...

Journal: :international journal of agricultural science, research and technology in extension and education systems 0
onwuchekwa raphael iheke department of agricultural economics, michael okpara university of agriculture, umudike pmb 7267, umuahia, abia state, nigeria ukandu ihuoma department of agricultural economics, michael okpara university of agriculture, umudike pmb 7267, umuahia, abia state, nigeria

this study examined the effect of urbanization on agricultural production in abia state. specifically, it categorized the land tenancy status of the farmers, analyzed the effect of urbanization on agricultural productivity and identified the constraints to agricultural productivity. multistage random sampling technique was used to select the respondents. primary data collected using structured ...

2012
Navjot Sodhi Teja Tscharntke Yann Clough Thomas C. Wanger Louise Jackson Iris Motzke Ivette Perfecto John Vandermeer Anthony Whitbread

Under the current scenario of rapid human population increase, achieving efficient and productive agricultural land use while conserving biodiversity is a global challenge. There is an ongoing debate whether land for nature and for production should be segregated (land sparing) or integrated on the same land (land sharing, wildlife-friendly farming). While recent studies argue for agricultural ...

2012
Nicolas Deguines Romain Julliard Mathieu de Flores Colin Fontaine

BACKGROUND In the past decade, accumulating evidence of pollinator decline has raised concerns regarding the functioning of terrestrial ecosystems and the sustainability of crop production. Although land-use changes have been advanced as the major causes, the affinities of most wild pollinators with the main land-use types remain unknown. Filling this gap in our knowledge is a prerequisite to i...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2008
Jingzhu Zhao Qishan Luo Hongbing Deng Yan Yan

This paper introduces the concepts and aims of sustainable agriculture in China. Sustainable agricultural development comprises sustainability of agricultural production, sustainability of the rural economy, ecological and environmental sustainability within agricultural systems and sustainability of rural society. China's prime aim is to ensure current and future food security. Based on projec...

Journal: :Journal of environmental quality 2008
Daren Harmel Song Qian Ken Reckhow Pamela Casebolt

The "Measured Annual Nutrient loads from AGricultural Environments" (MANAGE) database was developed to be a readily accessible, easily queried database of site characteristic and field-scale nutrient export data. The original version of MANAGE, which drew heavily from an early 1980s compilation of nutrient export data, created an electronic database with nutrient load data and corresponding sit...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2014
Thomas W Hertel Navin Ramankutty Uris Lantz C Baldos

There has been a resurgence of interest in the impacts of agricultural productivity on land use and the environment. At the center of this debate is the assertion that agricultural innovation is land sparing. However, numerous case studies and global empirical studies have found little evidence of higher yields being accompanied by reduced area. We find that these studies overlook two crucial f...

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