نتایج جستجو برای: agricultural land

تعداد نتایج: 204615  

2016
Helena I. Hanson Erkki Palmu Klaus Birkhofer Henrik G. Smith Katarina Hedlund Nicolas Chaline

In order to improve biological control of agricultural pests, it is fundamental to understand which factors influence the composition of natural enemies in agricultural landscapes. In this study, we aimed to understand how agricultural land use affects a number of different traits in ground beetle communities to better predict potential consequences of land-use change for ecosystem functioning....

2009
Derrick Chip Brown

Agricultural drain tile systems are a significant influence on the condition of wetlands and waterways. The influence of these systems is often difficult to determine since installation records are incomplete or were never kept. Using a modified decision class tree and raster analysis in ArcGIS, a model for predicting the location of land drained by subsurface systems was evaluated. The three-c...

2008

The environmental impact of agriculture cannot be ignored. In many countries, as much as 70 per cent of the land area is in agricultural use. Over a third of the global agricultural land area is in high-intensity, continuous cropping systems that use high levels of agrochemicals and reshape land and waterways. The rest is under such a farming system that uses far fewer inputs, but requires rela...

2006
Laura Schneider Jacqueline Geoghegan

Plant invasions and their impact on land use pose difficult research questions, due to the complex relationships between the ecological nature of the invasion and the human responses to the invasion. This paper focuses on the linkages between an invasion of bracken fern and land use decisions in an agricultural frontier in southern Mexico. Agriculture in this region is practiced on an extensive...

2007
FRANK D. W. WITMER

The use of satellite technology by military planners has a relatively long history as a tool of warfare, but little research has used satellite technology to study the effects of war. This research addresses this gap by applying satellite remote sensing imagery to study the effects of war on land-use/land-cover change in northeast Bosnia. Though the most severe war impacts are visible at local ...

Journal: :Remote Sensing 2017
Beatriz Bellón Agnès Bégué Danny Lo Seen Claudio Aparecido de Almeida Margareth Simões

In response to the need for generic remote sensing tools to support large-scale agricultural monitoring, we present a new approach for regional-scale mapping of agricultural land-use systems (ALUS) based on object-based Normalized Difference Vegetation Index (NDVI) time series analysis. The approach consists of two main steps. First, to obtain relatively homogeneous land units in terms of pheno...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2010
Gillian L Galford Jerry M Melillo David W Kicklighter Timothy W Cronin Carlos E P Cerri John F Mustard Carlos C Cerri

The Brazilian Amazon is one of the most rapidly developing agricultural areas in the world and represents a potentially large future source of greenhouse gases from land clearing and subsequent agricultural management. In an integrated approach, we estimate the greenhouse gas dynamics of natural ecosystems and agricultural ecosystems after clearing in the context of a future climate. We examine...

1997

1. Despite wide recognition of the need for catchment-scale management to ensure the integrity of river ecosystems, the science and policy basis for joint management of land and water remains poorly understood. An interdisciplinary case study of a river basin in south-eastern Michigan is presented. 2. The River Raisin drains an area of 2776 km2, of which some 70% is agricultural land. The upper...

2015
S.M.F. Rabbi Matthew Tighe Manuel Delgado-Baquerizo Annette Cowie Fiona Robertson Ram Dalal Kathryn Page Doug Crawford Brian R. Wilson Graeme Schwenke Malem Mcleod Warwick Badgery Yash P. Dang Mike Bell Garry O’Leary De Li Liu Jeff Baldock

Australia's "Direct Action" climate change policy relies on purchasing greenhouse gas abatement from projects undertaking approved abatement activities. Management of soil organic carbon (SOC) in agricultural soils is an approved activity, based on the expectation that land use change can deliver significant changes in SOC. However, there are concerns that climate, topography and soil texture w...

2007
S. Tülin Akkaya

Agriculture plays an essential role in restructuring and country planning. However, the agricultural world is under economic pressures that affect the efficiency of landowners. To ensure good productivity, the farmer needs his land to be spatially well organised and well equipped. To use the agricultural land most efficiently, it is important first to understand the area by collecting together ...

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