Sökning: "Forest biogeochemistry"
Visar resultat 11 - 15 av 15 avhandlingar innehållade orden Forest biogeochemistry.
11. The role of vegetation dynamics in the control of atmospheric CO2 content
Sammanfattning : This thesis contains a description of the Lund-Potsdam-Jena Dynamic Global Vegetation Model (LPJ-DGVM) and its application to infer the role of vegetation dynamics on atmospheric CO2 content at different time-scales. The model combines vegetation dynamics and biogeochemistry in a modular framework. LÄS MER
12. Recovery from Acidification - Policy Oriented Dynamic Modeling
Sammanfattning : Dynamic biogeochemistry models are important tools for determining the time-scales of recovery from acidification. In the review process of the 1999 UNECE LRTAP Gothenburg protocol, results from dynamic models will probably be included when determining further reductions of acidifying emissions. LÄS MER
13. Redefining the role of wetlands as methyl mercury sources : insights from wetlands before and after restoration
Sammanfattning : Current literature identifies boreal wetlands as net sources for the potent neurotoxin methyl mercury (MeHg). Combined with national environmental aims of restoration of previously drained wetlands, there is a possible conflict between the ecological benefits of wetlands and their role as MeHg sources. LÄS MER
14. Land-atmosphere interactions and regional Earth system dynamics due to natural and anthropogenic vegetation changes
Sammanfattning : Observation and modelling studies have indicated that the global land surfaces have been undergoing significant changes in the past few decades, driven by both natural and anthropogenic factors, such as changes in ecosystem productivity, fire and land use. Land surface changes can potentially influence local and regional climate through land-atmosphere interactions. LÄS MER
15. The role of biogeophysical feedbacks and their impacts in the arctic and boreal climate system
Sammanfattning : The physical environment in the northern high latitudes including the Arctic cryosphere has undergone dramatic changes due to anthropogenic greenhouse gas warming, which since pre-industrial times has been twice or more the rate of global mean warming. Global climate models predict that this accelerated warming will continue for at least the next few decades. LÄS MER