Journal
JOURNAL OF FOREST RESEARCH
Volume 16, Issue 5, Pages 394-404Publisher
SPRINGER TOKYO
DOI: 10.1007/s10310-011-0286-1
Keywords
Biomass productivity; Internal nitrogen cycling; Japanese cedar plantations; Soil nitrogen availability; Stand development
Categories
Funding
- Research Institute for Humanity and Nature [5-2]
- Ministry of Education, Culture, Sports, Science and Technology [15380105, 22780145]
- Japan Science Society
- Division of Integrated Coastal Management, FSERC, Kyoto University
- Grants-in-Aid for Scientific Research [22248016, 22780145, 15380105, 23780166] Funding Source: KAKEN
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We examined soil N dynamics, including inorganic N concentration, net N transformation rates, and estimated plant N uptake (EPNU) from soil N budgets, and litterfall inputs, in five Japanese cedar plantation stands of different ages (5, 16, 31, 42, and 89 years) in the Mt Gomadan Experimental Forest (GEF). Net soil N mineralization and nitrification rates did not differ significantly between the youngest and oldest stands; soil moisture and inorganic N concentration were higher in the youngest stand. The EPNU was highest in the 16-year-old stand and lowest in the 31-year-old stand, and had a significant negative correlation with litter C:N ratio. The oldest (89-year-old) stand had a higher soil C:N ratio, lower proportion of nitrification rate to mineralization rate (%NIT), and higher estimated plant NH(4) (+) uptake than did the other stands, indicating that changes of soil organic matter quality can alter soil N dynamics. These results suggest that as a Japanese cedar plantation develops, soil N dynamics can be altered by the quantity and quality of input litter and soil organic matter, and can generate the imbalance between N supply from soil and N demand by plant.
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