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首页> 外文期刊>Journal of forest research >Assessing decline in physical structure of deciduous hardwood forest stands under sika deer grazing using shrub-layer vegetation cover
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Assessing decline in physical structure of deciduous hardwood forest stands under sika deer grazing using shrub-layer vegetation cover

机译：利用灌木层植被覆盖度评估梅花鹿放牧下的落叶硬木林分的物理结构下降

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摘要

For 345 stands of deciduous hardwood forest in Hyogo Prefecture, Western Japan, we assessed the decline of shrub-layer vegetation due to sika deer in each stand by using the shrub-layer decline rank (SDR), determined by combining the shrub-layer vegetation cover and the presence of signs of grazing by sika deer in a stand. Since there was a geographical correlation between SDR and sighting per unit effort (SPUE), which is an index of the relative density of sika deer, it appeared that decline of shrub-layer vegetation in a stand can be accurately evaluated by SDR. There were correlations between SDR and several variables that indicate the status of components in forests (presence of saplings of tall trees, occurrence of bark stripping of tall trees, proportion of bark-stripped stems of Clethra barvinervis, decline of subtree-layer vegetation by bark stripping, cover of litter on the ground, and area of soil surface erosion). These results indicate that the status of these components changes with decline of shrub-layer vegetation by sika deer grazing. It is thought that such synchronizations are caused by sika deer grazing or a direct or indirect effect by decline of shrub-layer vegetation due to sika deer. Therefore, it is reasonable to assess decline in physical structure due to sika deer for stands of deciduous hardwood forests according to SDR.
机译：对于日本西部兵库县的345棵落叶阔叶林，我们使用灌木层衰退等级（SDR）评估了每个林分中梅花鹿引起的灌木层植被的衰退，该等级是通过组合灌木层植被确定的盖和看台上有梅花鹿放牧的迹象。由于SDR与每单位目击量（SPUE）之间存在地理相关性，这是梅花鹿相对密度的指标，因此似乎可以通过SDR准确评估林分中灌木层植被的衰退。 SDR与表明森林成分的几个变量之间存在相关性（高大树苗的存在，高大树皮剥皮的发生，克雷丝（Clethra barvinervis）剥去树皮的茎的比例，树皮下亚层植被的减少）剥落，地面上的垃圾覆盖以及土壤表面侵蚀的区域）。这些结果表明这些成分的状态随着梅花鹿放牧而导致灌木层植被的减少而改变。据认为，这种同步是由梅花鹿放牧引起的，或者是由于梅花鹿引起的灌木层植被减少而直接或间接地引起的。因此，根据SDR评估落叶硬木林分梅花鹿引起的物理结构下降是合理的。

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