Distribution and Nutrient Contents of Fine Roots in the Fushan Subtropical Broadleaf Forest in Taiwan

福山亞熱帶闊葉林細根的分布和養分含量

林國銓(Kuo-Chuan Lin) ； 王巧萍(Chiao-Ping Wang) ； 馬復京(Fu-Ching Ma)

《台灣林業科學》 20卷1期 (2005/03) Pp. 1-11

https://doi.org/10.7075/TJFS.200503.0001

摘要

The biomass and nutrient contents of fine roots were investigated and estimated in the Fushan subtropical broadleaf forest in northeastern Taiwan. The result indicated that the fine root density decreased with increasing soil depth. In 0~30 cm of soil, the biomass of fine roots was approximately 677 gm^(-2) for a size of＜2 mm, 335gm^(-2) for 2~5-mm fine roots, and 61 gm^(-2) for the necromass. The total length of fine roots of＜2 mm was approximately 3,860 mm^(-2), but only 120 mm^(-2) for 2~5-mm roots. The fine root biomass in Fushan is higher than that in temperate forests and similar to that in tropical rain forests. This may mainly be due to the lower available P as a result of torrential rains, which promotes the accumulation of fine roots. At the same time, as fine roots accumulate a large amount of N and P, they play an important role in the storage of nutrients in the ecosystem.

關鍵字

細根 ； 養分含量 ； 亞熱帶濶葉林 ； 挖掘法 ； 根長比

並列摘要

The biomass and nutrient contents of fine roots were investigated and estimated in the Fushan subtropical broadleaf forest in northeastern Taiwan. The result indicated that the fine root density decreased with increasing soil depth. In 0~30 cm of soil, the biomass of fine roots was approximately 677 gm^(-2) for a size of＜2 mm, 335gm^(-2) for 2~5-mm fine roots, and 61 gm^(-2) for the necromass. The total length of fine roots of＜2 mm was approximately 3,860 mm^(-2), but only 120 mm^(-2) for 2~5-mm roots. The fine root biomass in Fushan is higher than that in temperate forests and similar to that in tropical rain forests. This may mainly be due to the lower available P as a result of torrential rains, which promotes the accumulation of fine roots. At the same time, as fine roots accumulate a large amount of N and P, they play an important role in the storage of nutrients in the ecosystem.

並列關鍵字

fine roots ； nutrient content ； subtropical broadleaf forest ； excavation method ； specific root length