Nitrogen leaching from surface soil in a temperate mixed forest subject to intensive deer grazing
Nitrogen leaching from surface soil in a temperate mixed forest subject to intensive deer grazing
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DOI：
10.1007/s11355-016-0296-4
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发表时间：
2016-04
影响因子：
2
通讯作者：
H. Furusawa;T. Hino;Hiroshi Takahashi;S. Kaneko
中科院分区：
文献类型：
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作者：
H. Furusawa;T. Hino;Hiroshi Takahashi;S. Kaneko
本研究旨在确定放牧对日本中部大原山温带混交林土壤氮矿化和氮淋溶的影响。在该混交林中，梅花鹿（Cervus nipponTemminck；以下简称鹿）的放牧减少了主导林下植被的sasa nipponicaMakino et Shibata（以下简称sasa）的生物量。采用离子交换树脂芯法测定了2006 ~ 2007年鹿围场内外0.3 m表层土壤氮矿化和氮淋失情况。鹿的放牧降低了莎草凋落物的碳氮比（C:N），这是由于地上生物量中枯死茎秆的碳氮比下降，而C:N比低于茎秆的叶片的比例增加。放牧增加了氮矿化和硝化速率，增加了年氮（氨氮和硝态氮）和硝态氮淋滤。放牧对土壤全碳、全氮含量无显著影响。放牧对氮矿化率的积极影响可能是由于放牧引起的莎草凋落物质的变化。鹿放牧导致的较高的年氮淋失可能与促进氮矿化率和减少植物氮吸收有关，例如，放牧导致地上生物量减少的莎草。
We aimed to determine the grazing impact on soil nitrogen (N) mineralization and N leaching in a temperate mixed forest on Mt. Ohdaigahara, central Japan, where Sika deer (Cervus nipponTemminck; hereafter deer) grazing has decreased biomass ofSasa nipponicaMakino et Shibata (hereafter sasa) that dominates the forest understory. Soil N mineralization and N leaching of the top 0.3-m layer were measured in situ from 2006 to 2007 by an ion-exchange resin core method inside and outside a deer exclosure. Deer grazing decreased the carbon to nitrogen (C:N) ratio of sasa litter because of the declining dead culm C:N ratio and the increasing ratio of leaves with a lower C:N ratio than culms in the aboveground biomass. Grazing increased N mineralization and nitrification rates as well as annual N (ammonium-N and nitrate-N) and nitrate-N leaching. In contrast, deer grazing did not increase the total soil C and N content. The positive effect of grazing on the N mineralization rate may have resulted from a qualitative change in sasa litter due to grazing. The higher annual N leaching resulting from deer grazing may have been related to the facilitated N mineralization rate and decreased N uptake in plants, e.g., sasa with less aboveground biomass due to grazing.