Förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i Mälaren
The water level of Lake Mälaren has been regulated since the 1940’s. A recent investigation suggests that the current regulation needs to be adjusted in order to prevent a decline in water level, salt water from infiltrating from Lake Saltsjön, and risk of floodings. In addition to these preventions...
| Autor principal: | |
|---|---|
| Formato: | L3 |
| Lenguaje: | sueco Inglés |
| Publicado: |
SLU/Dept. of Soil and Environment
2011
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| Materias: |
| _version_ | 1855570486314926080 |
|---|---|
| author | Granath, Maja |
| author_browse | Granath, Maja |
| author_facet | Granath, Maja |
| author_sort | Granath, Maja |
| collection | Epsilon Archive for Student Projects |
| description | The water level of Lake Mälaren has been regulated since the 1940’s. A recent
investigation suggests that the current regulation needs to be adjusted in order to
prevent a decline in water level, salt water from infiltrating from Lake Saltsjön,
and risk of floodings. In addition to these preventions, the new regulation could
potentially effect the natural environment and agriculture practices in the low
lands that surround the lake. The new regulation proposal calls for an increase in
variations in Mälaren’s water level during seasons, while the annual mean water
level will remain the same. The Swedish Agriculture Industry has been given a lot
of restrictions by the Swedish government in order to decrease it’s nitrogen leakage
to ground and surface water. Nitrogen is very much affected by the water content
in the soil through microbial activity as well as for transportation in the soil.
The aim of this thesis was to investigate how the water flow in the soil in lowland
areas around lake Mälaren would change with the proposed regulation. Based on
results from the modelling program Drainmod. A comparison was made between
the old regulation and the new regulation proposal. Based on the Drainmod results,
the differences in nitrate-nitrogen flow to ground water and fictitious spring crop
production are likely to be minimal between the two regulation proposals. In the
new regulation there is a possibility for delayed spring agricultural tilling due to a
higher water level during the spring season. Over the whole period of 30 years, the
old regulation has a slightly bigger runoff volume which indicates a possible
greater loss of nitrogen. There are differences between the input data and the actual
simulated data for the precipitation in the model which gives reason to question
the results in this study. |
| format | L3 |
| id | RepoSLU2815 |
| institution | Swedish University of Agricultural Sciences |
| language | swe Inglés |
| publishDate | 2011 |
| publishDateSort | 2011 |
| publisher | SLU/Dept. of Soil and Environment |
| publisherStr | SLU/Dept. of Soil and Environment |
| record_format | eprints |
| spelling | RepoSLU28152012-04-20T14:20:26Z Förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i Mälaren Changes in nitrate leakage and crop production in agricultural lowland around Lake Mälaren as a result of new water level regulations Granath, Maja markvetenskap nitratläckage växtproduktion reglerad dränering Drainmod The water level of Lake Mälaren has been regulated since the 1940’s. A recent investigation suggests that the current regulation needs to be adjusted in order to prevent a decline in water level, salt water from infiltrating from Lake Saltsjön, and risk of floodings. In addition to these preventions, the new regulation could potentially effect the natural environment and agriculture practices in the low lands that surround the lake. The new regulation proposal calls for an increase in variations in Mälaren’s water level during seasons, while the annual mean water level will remain the same. The Swedish Agriculture Industry has been given a lot of restrictions by the Swedish government in order to decrease it’s nitrogen leakage to ground and surface water. Nitrogen is very much affected by the water content in the soil through microbial activity as well as for transportation in the soil. The aim of this thesis was to investigate how the water flow in the soil in lowland areas around lake Mälaren would change with the proposed regulation. Based on results from the modelling program Drainmod. A comparison was made between the old regulation and the new regulation proposal. Based on the Drainmod results, the differences in nitrate-nitrogen flow to ground water and fictitious spring crop production are likely to be minimal between the two regulation proposals. In the new regulation there is a possibility for delayed spring agricultural tilling due to a higher water level during the spring season. Over the whole period of 30 years, the old regulation has a slightly bigger runoff volume which indicates a possible greater loss of nitrogen. There are differences between the input data and the actual simulated data for the precipitation in the model which gives reason to question the results in this study. SLU/Dept. of Soil and Environment 2011 L3 swe eng https://stud.epsilon.slu.se/2815/ |
| spellingShingle | markvetenskap nitratläckage växtproduktion reglerad dränering Drainmod Granath, Maja Förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i Mälaren |
| title | Förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i Mälaren |
| title_full | Förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i Mälaren |
| title_fullStr | Förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i Mälaren |
| title_full_unstemmed | Förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i Mälaren |
| title_short | Förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i Mälaren |
| title_sort | förändring av nitratläckage och växtproduktion från låglänt jordbruksmark vid en ny reglering av vattennivån i mälaren |
| topic | markvetenskap nitratläckage växtproduktion reglerad dränering Drainmod |