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首页> 外文期刊>Journal of forest research >Within- and between-site variations in leaf longevity in hinoki cypress (Chamaecyparis obtusa) plantations in southwestern Japan
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Within- and between-site variations in leaf longevity in hinoki cypress (Chamaecyparis obtusa) plantations in southwestern Japan

机译：日本西南部扁柏（Chamaecyparis obtusa）人工林叶片寿命的站点内和站点间变化

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We investigated mean leaf retention time in order to elucidate the factors affecting regional and local variations in stand-level leaf longevity in hinoki cypress (Chamaecyparis obtusa) plantations. Our study sites consisted of six stands at a low elevation (320-370 m a.s.l.) and 12 stands at a high elevation (850-970 m a.s.l.) in southwestern Japan. We also used published data on leaf longevity in stands at various elevations to clarify the regional-scale variations in leaf longevity and their relationships to environmental factors. At the regional scale, leaf longevity increased with increasing elevation and with decreasing air temperature, growing season length, and Kira's warmth index across sites. Similar relationships were obtained for the variation in leaf mass. At the local scale, leaf longevity did not show a clear relationship with topographic position, soil water content, or soil C/N ratio. Contrary to our expectation, leaf longevity was negatively correlated with the leaf C/N ratio at both study sites, although the significance level was marginal. This indicates greater leaf longevity with better leaf nutrient status. Our results suggest that responses of leaf longevity in hinoki cypress stands to environmental factors would be more prominent at the regional scale than at the local scale, although large variation was detected at the local scale. Air temperature and growing season length appear to be the main drivers of the variation in leaf longevity at the regional scale, whereas the causal factors are unclear at the local scale.
机译：我们调查了平均叶片保留时间，以阐明影响扁柏（Chamaecyparis obtusa）人工林林分水平叶片寿命的区域和局部变化的因素。我们的研究地点包括日本西南部的六个低海拔林分（320-370 m a.s.l.）和12个海拔高海拔林分（850-970 m.s.l.）。我们还使用了有关不同海拔林分中叶片寿命的公开数据，以阐明叶片寿命及其与环境因素的关系的区域尺度变化。在区域范围内，叶片寿命随着海拔的升高，气温的降低，生长季节的长短以及基拉州各地的温暖指数的增加而增加。对于叶片质量的变化获得类似的关系。在当地范围内，叶片寿命与地形位置，土壤含水量或土壤碳氮比没有明显关系。与我们的预期相反，在两个研究地点，叶片寿命与叶片碳氮比呈负相关，尽管显着性水平微不足道。这表明叶片寿命更长，叶片养分状况更好。我们的研究结果表明，尽管在本地尺度上发现了较大的差异，但扁柏林中叶片长寿对环境因素的响应在区域尺度上比在地方尺度上更为突出。气温和生长季节长度似乎是区域尺度上叶片寿命变化的主要驱动力，而在地方尺度上，其致病因素尚不清楚。

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