Effects of clear-cutting on nitrogen leaching and fine root dynamics in a cool-temperate forested watershed in northern Japan
Effects of clear-cutting on nitrogen leaching and fine root dynamics in a cool-temperate forested watershed in northern Japan
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DOI：
10.1016/j.foreco.2006.01.001
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发表时间：
2006-04-15
影响因子：
3.7
通讯作者：
Sasa, K
中科院分区：
文献类型：
--
作者：
Fukuzawa, K;Shibata, H;Sasa, K
在日本北方的森林流域，研究了林下植被--矮竹（Sasa senanensis）的砍伐对流域生态地球化学过程的影响。树木砍伐并没有造成显着增加的硝酸盐（NO3-）浓度在溪流在生长季节后切割。随后的Sasa切割导致流NO3-浓度显著增加至约。15 μ mol L-1。有没有显着的变化流pH值以下两个切割。土壤溶液中NO3-浓度在两种采伐后均有所增加，但采伐后浓度变化幅度大于采伐后（> 100 μ mol L-1）。而在河岸保护区，砍伐树木后土壤溶液中NO3-含量保持较低水平，表明河岸保护区在砍伐树木后起到了NO3-汇的作用。伐后细根总生物量无显著变化，尽管树木根系减少，但竹根生物量增加。随后的Sasa切割造成细根生物量减少50%，相比，在uncut Sasa网站。这些结果表明，在防止氮素淋失的树木砍伐后，莎莎吸收氮是非常重要的。而Sasa砍伐后氮吸收量的下降导致NO3显着浸出到溪流中。(c)2006 Elsevier B. V.保留所有权利。
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.