Effects of clear-cutting on nitrogen leaching and fine root dynamics in a cool-temperate forested watershed in northern Japan

FOREST ECOLOGY AND MANAGEMENT

卷:225

Article

Fukuzawa, K ; Shibata, H ; Takagi, K ; Nomura, M ; Kurima, N ; Fukazawa, T ; Satoh, F ; Sasa, K

关键词: fine root biomass;    nitrate;    Sasa dwarf bamboo;    soil solution;    stream chemistry;   

DOI  :  10.1016/j.foreco.2006.01.001

来源: Elsevier

【 摘 要 】

cutting of understory vegetation, dwarf bamboo (Sasa senanensis), were investigated to understand the effect of these disturbances on biogeochemical processes on forested watershed in northern Japan. Tree-cutting did not cause a significant increase of nitrate (NO3-) concentration in stream water during the growing season after the cutting. Subsequent Sasa-cutting caused significant increase of stream NO3- concentration to ca. 15 mu mol L-1. There was no significant change of stream pH following both cuttings. NO3- concentration in soil solution increased after both cutting, but the change of concentration was higher (> 100 mu mol L-1) after the Sasa-cutting than after the tree-cutting. In a riparian conserved area, on the other hand, NO3- in soil solution remained low after tree-cutting, suggesting the riparian area acted as a NO3- sink after the tree-cutting. There was no significant change in total biomass of fine roots after the tree-cutting because of an increase in Sasa root biomass despite a decrease in tree roots. The subsequent Sasa-cutting caused a 50% decrease of fine root biomass compared to that in the un-cut Sasa site. These results suggested that nitrogen uptake by Sasa was very important in preventing nitrogen leaching after tree-cutting. and decline of this nitrogen uptake after Sasa-cutting lead to marked NO3- leaching to the stream. (c) 2006 Elsevier B.V. All rights reserved.

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