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Limit Values and Factors influencing Limit Values of Spruce
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Statistics.
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

We collected the data for decomposition of spruce litter to determine the limit values of mass loss and to find both chemical and climate factors that influence limit values. Our data contained 28 sequences of spruce which mainly in Sweden and a small part in other places. We choose mean annual temperature (MAT) and mean annual precipitation (MAP) as climate factors and water solubles, lignin, N, P, K, Ca, Mg and Mn as chemical factors. Then we got the estimated limit values by performing a nonlinear model with mass loss and time spots, and found out the influential factors by using another linear mixed model. At the end we knew that linear mixed model is a proper and efficient approach for determining the factors, P and MAP are the significant factors and Species is a good random effect to explain the variance within groups.

Place, publisher, year, edition, pages
2011. , 22 p.
Keyword [en]
Limit Values, Litter decomposition, Nonlinear model, Linear mixed model
URN: urn:nbn:se:uu:diva-155062OAI: diva2:423568
Subject / course
Educational program
Master Programme in Statistics
2011-05-23, B115, ekonomikum, Uppsala, 15:00 (English)
Physics, Chemistry, Mathematics
Available from: 2011-06-23 Created: 2011-06-15 Last updated: 2011-06-23Bibliographically approved

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Zhang, Liming
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