Boreal and temperate tree species are adapted to the seasonally varying climatic conditions with their annual cycle of development so that the frost hardy dormant phase and the susceptible growth phase are synchronized with the seasonality of the climate. The annual cycle includes various attributes such as timing of bud burst and other phenological events, and seasonality of photosynthetic capacity or frost hardiness of the trees. During the last few decades dynamic ecophysiological models have been used increasingly in studies of the annual cycle, especially when projecting the ecological effects of climate change. These studies are reviewed and some additional new ideas on the topic are also introduced. A unifying notation is used throughout the book when discussing different aspects of the annual cycle. Main emphasis is on combining modelling with experimental studies and on the importance of the biological realism of the models
The presence - or absence - of soil organic matter (SOM) has important implications for agricultural productivity. It could also have significant implications for global climate due to its role as a source/sink of carbon. Therefore, it is important to understand the issues related to the accumulation or loss of SOM, to use what we have learned from experiments to make sound decisions about soil and crop management, and to test models and future concepts concerning SOM management. A database is included with the book, presenting tabular data for 34 sites in North America.
"The PhD thesis written by Mr. Ackermann is an outstanding and in-depth scientific study that closes a research gap and paves the way to new developments. Despite the extremely complex issues, his work is very understandable and excellently elaborated."