Journal
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
Volume 166, Issue 3, Pages 300-307Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jpln.200390047
Keywords
CO2; forest; soil; temperature; carbon; delta C-13; C-14; amino acid; humic
Categories
Ask authors/readers for more resources
As concentrations of atmospheric CO 2 increase, it is important to know whether this may result in feedbacks that could modify the rate of increase of CO2 in the atmosphere. Soil organic matter (SOM) represents one of the largest pools of C and mineralization rates are known to be temperature dependent. In this study, we investigated whether different OM fractions present in a forest soil (F/A1 horizon) would respond in a similar manner to elevated temperatures. We examined the trends in isotopic content (C-12, C-13, and C-14) of soil respired CO2 at various temperatures (10, 20, and 35 degreesC) over a two year period in the laboratory. We also examined the total C, total N, and C : N ratio in the remaining soil and isolated humic fractions, and the distribution of the individual amino acids in the soil after 5 years of laboratory incubation at the various temperatures. We found that the rate at which C mineralization increases with temperature was occasionally greater than predicted by most models, more C from recalcitrant OM pools being mineralized at the higher temperature. This confirmed that the relationship between soil organic matter decomposition and temperature was complex and that the different pools of organic matter did respond in differing ways to elevated temperatures.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available