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Study on the Litterfall and Forest Soil Nutrient Dynamics of Natural Hardwoods in Nao-Liao River
|關鍵字:||litterfall;枯落物;soil nutrient pool;土壤養分庫;枝葉層;分解速率;腦寮溪||出版社:||森林學系||摘要:||
The purpose of this study was to explicate how the nutrient dynamics of forest from vegetation to soils changed. The content and concentration of litterfall, litter decomposition and soil nutrient pool were investigated monthly from August 2001 to March 2003 in the natural hardwoods of the Nao-Liao River.
The amount of litterfall produced in this site was 9.14 t/ha yearly. Most of the litterfall were composed by leaves, followed by branch, others and reproduction. The seasonal variability of litterfall showed a uni-modal distribution pattern. In this study period, the litterfall variability was due to the strong typhoon , Nakri, which might have led to increased more than 5 to 114 times branch litter compared with other months.
Nutrients concentration of litterfall was in the order as C>N>Ca>K>Mg>P>Na>Fe>Mn, and the concentration of litterfall was highest in others, followed by reproduction. The seasonal variability showed the highest during later spring(April-June)and later autumn(October-January). In addition, nutrient returned to the soil through litterfall among different component was greatest in leaves.
Leaf litter decomposition rate in this site was affected by rainfall, and showed rapid rate during the 190th to 245th days. The decomposition rate and dynamics of remaining were affected by rainfall distributtion. Nutrient dynamics during decomposition indicated that the N, Ca, Mn, Fe and S concentration were increased until the study ended, the C and Mg concentration was decreased, K and Na concentration was decreased initially but then increased.
Nutrient concentrations of litter layer were determine by the initial nutrient composition of litterfall. The Mg, P, Na, K, Ca and Mn concentration of litter layer were varied significantly(P<0.01)each months. The nutrients content were mainly determined by the litterfall mass, and their content was decreased in order: H layer>F layer>L layer. Nutrient concentrations and content of soil were decreased with soil depth and mainly distributed in the 0 to 10 cm soil depth, it showed that maximum nutrients concentration occurred in August and minimum in April.
|Appears in Collections:||森林學系|
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