2009-06-02 (Tue) 10:30
Review Seminar: The factors of litter decomposition
Litter decomposition controls the amount of carbon releasing to atmosphere and nutrient ability in natural ecosystems. In peatland ecosystems, the accumulation of organic matter is primarily caused by slow rate of litter decomposition. The decomposition rate mainly depends on microbial degradation, photodegradation and physical fragmentation. In particular, microbial degradation is affected by various environmental factors such as temperature, moisture and nutrient availability.
I have researched the decomposition rates on early colonized plants, Rhynchospora alba and Moliniopsis japonica, using a litter bag method in a post-mined peatland, Sarobetsu Mire, from 2008. In this study, the litter decomposition rates seems to be slower than those showed in previous studies and are not different between the grassland of R. alba and M. japonica. Now I focus on why the decomposition rates are slow in Sarobetsu Mire.
In this seminar, I will introduce the following papers focusing on the factors that controls litter decomposition rates.
Rejmankova E. and Houdkova K.
Wetland plant decomposition under different nutrient conditions: what is more important, litter quality or site quanlity?
Biogeochemistry(2006), 80: 254-262
Fennessy MS, Rokosch A. and Mack JJ.
Patterns of plant decomposition and nutrient cycling in natural and created wetlands
WETLANDS(2008), 2: 300-310
Atkinson RB. and Cairns J.
Plant decomposition and litter accumulation in depressional wetlands: functional performance of two wetland age classes that were created via excavation
WETLANDS(2001), 3: 354-362
Clare JT, Johnson D. and Artz RRE.
Litter type, but not plant cover, regulates initial litter decomposition and fungal community structure in a recolonising cutover peatland
Soil Biology and Biochemistry
Bragazza, L ; Siffi, C ; Iacumin, P ; Gerdol, R
Mass loss and nutrient release during litter decay in peatland: The role of microbial adaptability to litter chemistry
SOIL BIOLOGY & BIOCHEMISTRY(2007), 39: 257-267