Kulstoflagring: Et muligt klimaredskab i fremtidige landbrugssystemer? Fokus på hypotese for humus´ støkiometriske ratio

Asta Hooge Poulsen

Studenteropgave: Speciale

Abstrakt

Focus of this project has been on a new method to increase carbon sequestration in farming systems to reduce greenhouse gas emissions from agriculture. The method takes outset in the stoichiometric ratio for humus, and is based on a changed fertilizer application to a field. This project is focused on an investigation of the methods applicability in Denmark, since the method has only been tested on Australian soils. The method impact on greenhouse gas emissions, influence on the environment and costs relating to an implementation in Danish farming systems is investigated in this project.
To investigate this a number of experiments have been conducted to examine the methods influence on carbon sequestration and soil organic matter. Furthermore the modelling tool APSIM has been used to simulate crop rotations, where the method has been applied. This was done to determine the long term effect of the method on a farming system.
Results showed that the method has a high potential as a climate mitigation tool. It was however not possible to detect an increase in carbon sequestration with the method on Danish soils. However this can be due to the length of the incubation period not being long enough. Results also showed that there are risks associated with the method. These involve uncertainties in regards to the mobility of nutrients in the soil. To be able to determine the methods applicability in Denmark, it is necessary to identify the methods full potential in regards to sequestrate carbon and its effect on soil dynamics. It is in addition to this essential to investigate the methods impact on the mobility of nutrients in the soil, to increase immobilisation so potential hazards for the environment can be reduced. Finally, it is necessary to define a balance between environmental and climate considerations in regards to the efficiency of the method.

UddannelserTekSam - miljøplanlægning, (Bachelor/kandidatuddannelse) Kandidat
SprogEngelsk
Udgivelsesdato30 sep. 2018
Antal sider94
VejledereHenrik Hauggaard-Nielsen

Emneord

  • Kulstoflagring
  • landbrug
  • klimaforandringer
  • humus