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

被引:58
|
作者
Fukuzawa, K
Shibata, H
Takagi, K
Nomura, M
Kurima, N
Fukazawa, T
Satoh, F
Sasa, K
机构
[1] Hokkaido Univ, Grad Sch Agr, Nayoro 0960071, Japan
[2] Hokkaido Univ, Field Sci Ctr No Biosphere, No Forestry & Dev Off, Nayoro 0960071, Japan
[3] Hokkaido Univ, Field Sci Ctr No Biosphere, Teshio Expt Forest, Toikanbetsu, Horonobe 0982943, Japan
[4] Hokkaido Univ, Grad Sch Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan
[5] Hokkaido Univ, Field Sci Ctr No Biosphere, So Forestry & Dev Off, Kita Ku, Sapporo, Hokkaido 0608589, Japan
关键词
fine root biomass; nitrate; Sasa dwarf bamboo; soil solution; stream chemistry;
D O I
10.1016/j.foreco.2006.01.001
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
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.
引用
收藏
页码:257 / 261
页数:5
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