Latitudinal variation in radial growth phenology of Cryptomeria japonica D. Don trees in Japan
Latitudinal variation in radial growth phenology of Cryptomeria japonica D. Don trees in Japan
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DOI：
10.1093/forestry/cpx055
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发表时间：
2018-04
期刊：
影响因子：
2.8
通讯作者：
T. Nishizono;K. Zushi;T. Hiroshima;Keisuke Toyama;F. Kitahara;Fumiko Terada;M. Takagi;S. Saito
中科院分区：
文献类型：
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作者：
T. Nishizono;K. Zushi;T. Hiroshima;Keisuke Toyama;F. Kitahara;Fumiko Terada;M. Takagi;S. Saito
研究了柳杉径向生长物候（径向生长的开始、停止和持续时间）的纬度变化。日本的唐树。径向生长，观察在16个站在多个纬度在日本使用测树仪。径向生长的开始表现出明显的纬度梯度：在高纬度地区，C。粳稻生长开始晚于低纬度地区。然而，停止径向增长是独立的纬度。因此，径向生长的持续时间（根据开始和停止日期定义）显示出微弱但显著的纬度梯度：在高纬度地点，C。在低纬度地区，日本树的生长期比树木短。生长的开始和持续时间分别强烈和微弱的温度的影响，虽然生长停止是不能解释的温度或降水。径向生长持续时间的纬向梯度弱，但显着支持的假设，即生长物候的区域变化是一个关键因素，负责长期增长的区域变化。此外，我们发现，在低纬度比在高纬度的增长持续时间更易变。
We investigated the latitudinal variation in radial growth phenology (onset, cessation, and duration of radial growth) of Cryptomeria japonica D. Don trees in Japan. The radial growth was observed using dendrometers in 16 stands at multiple latitudes throughout Japan. The onset of radial growth showed a clear latitudinal gradient: at high-latitude sites, C. japonica growth started later than at low-latitude sites. However, cessation of radial growth was independent of latitude. Consequently, the duration of radial growth (defined based on the onset and cessation dates) showed a weak but significant latitudinal gradient: at high-latitude sites, C. japonica trees grew for a shorter period than trees at low-latitude sites. The onset and duration of growth were respectively strongly and weakly affected by temperature, although growth cessation was not explained by temperature or precipitation. The latitudinal gradient for duration of radial growth weakly but significantly supports the hypothesis that regional variation in growth phenology is a key factor responsible for the regional variation in long-term growth. Furthermore, we found that growth duration was more variable at low latitudes than at high latitudes.