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• W1827243955 abstract "Small water bodies in the shape of ponds and wetlands have an important function inboth the terrestrial and the aquatic environment. They serve as a buffer to prevent rashout-flow of nutrients into the oceans and they maintain biological diversity for plantsand animals.Most anthropogenic small waters originated in the 19th century and beginning of 20thcentury. During this time, good fertilizing soil was removed from the land andremaining cavities were filled with water. When farming was made more effective theground was leveled and these small waters vanished. Since mid 1980 the importanceof small water bodies and wetlands has received attention in a variety ofenvironmental projects.The purpose of this masters thesis paper is to estimate the change of small waterbodies during the last 60 years its effects. The methodology we used was; (1) initialremote sensing, (2) field-visits, (3) GIS onscreen digitizing and (4) GIS analysis. Themain software and materials used were ESRI’s ArcGIS and aerial photos from 1940’s,1980’s and 2000’s. A randomized selection of thirty 5*5 kilometers in Skane was thebase for the study. In these thirty squares the inventory and analysis included; (1)estimation of the total number of small waters and their total accumulated area, (2) acomparison of total number and total area of water in forest and farmland based onland use in each square, (3) classification of small waters into seven area classes (4)studies of what actual land use (farmland, grassland, coniferous, deciduous, urbanareas, clear cut forest and wetlands) has seen change in small water.The results show that the number of small waters has decreased between the 1940’sand the 1980’s from 2529 to 1143. There has been an increase between the 1980’s and2000’s from 1143 to 1400. The total area of small water bodies however is in factmore in the 2000’s than it was in the 1940’s. The small waters that have vanished aremainly in the range of 0-1 hectares. Many of these that have disappeared weresituated in farmland and wetlands during the 1940’s. On the other hand, waters ingrassland increased in the 2000’s. These changes in waters have made a great impacton the landscape, biological diversity and nitrogen retention on land. The environmenthas become sparse, a variety of plants and animal species have decreased and morenutrients flow out to the ocean.This masters thesis has provided a basis for more in depth studies of nitrogenretention in wetlands and small water bodies. With this data one can go deeper into acertain watershed and try to estimate its nitrogen retention based on additional inputs.One could also try to estimate how many water bodies there is in a certain watershedand use that for further studies. This database could also be used in studies such asbiological diversity changes." @default.
• W1827243955 created "2016-06-24" @default.
• W1827243955 creator A5073637345 @default.
• W1827243955 date "2004-01-01" @default.
• W1827243955 modified "2023-09-23" @default.
• W1827243955 title "Skånska småvatten nu och då - jämförelse mellan 1940, 1980 och 2000-talet" @default.
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