| 1. |
- Cousins, Sara A. O., et al.
(författare)
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A methodological study for biotope and landscape mapping based on CIR aerial photographs
- 1998
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Ingår i: Landscape and Urban Planning. - 0169-2046 .- 1872-6062. ; 41:3-4, s. 183-192
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we present a method for base-line mapping of biotope and landscape elements in the rural Swedish agricultural landscape. The overall goal is to elaborate a classification system for a national landscape monitoring program, based on interpretation of existing colour infrared (CIR) aerial photographs at the scale 1:30000, and including a field control. The classification system developed was tested by mapping landscape elements in strategically selected test areas, and it is assessed with respect to interpretation accuracy. The landscape elements, mapped separately as patches, lines and points, are significant for the biodiversity on landscape level, and are susceptible to change. The classification system is based on a hierarchical approach in five levels, with regard to land use and management, nature type and succession stage, moisture, physiognomy, vegetation cover and plant species. By using the method and the suggested classification system, a base-line mapping can be done very quickly and accurately. The mapping rate is 1.4-2.8 km(2)/h and the interpretation accuracy is 95-99%.
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| 2. |
- Vought, Lena B. M., et al.
(författare)
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Structure and function of buffer strips from a water-quality perspective in agricultural landscapes
- 1995
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Ingår i: Landscape and Urban Planning. - 0169-2046 .- 1872-6062. ; 31:1-3, s. 323-331
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Tidskriftsartikel (refereegranskat)abstract
- Buffer strips can greatly improve the water quality of nearby agricultural streams by reducing nutrient leaching in groundwater and surface water runoff, even though they comprise little of the total catchment area. Hence, vegetated buffer zones located along streams and in the upland portions of the catchment can minimize erosion or trap sediments in surface runoff and thereby decrease phosphorus loading in surface water. For example, a buffer strip 10 m wide can reduce the phosphorus load, typically bound to sediment, by as much as 95%. Moreover, both natural and constructed riparian forests and wetlands may create conditions favorable for nitrogen transformation/removal by soil microbial processes such as denitrification, with as much as 100% of the nitrate being removed in these zones.In addition to nutrient removal, buffer strips will increase the diversity of flora and fauna in the otherwise monocultural landscape. The vegetation along the stream will also stabilize the stream banks and improve habitat for both fish and invertebrates within the stream.
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