Impact of frost damage due to climate warming on growth and distribution of Fagus crenata.

我们研究了青冈地区4个地点49年(1961-2009年)的树轮生长，并估算了叶片冲刷后的日平均气温、最低气温和晚霜频率。日本北部青森县的客田县，包括该地区的塔希罗泰拉盆地，以测试气候变暖是否通过增加晚霜损害来减少物种的生长。在此期间，每个站点的晚霜次数从一到四次不等。在四个地点中，晚霜减少了塔希罗泰拉的年轮生长。此外，在包括塔希罗泰拉在内的两个地区，树轮生长与叶片冲刷后的日最低气温相关。晚霜发生的持续时间较短，无法分析晚霜危害与气候变暖的关系。

We examined tree-ring growth of Fagus crenata and estimated daily mean- and minimum-air-temperature and frequency of late frost after leaf-flushing for 49 years (1961-2009) at four sites in Mt. Hakkoda, Aomori prefecture, northern Japan, including Tashirotaira, a basin in the area, to test if climate warming reduces growth of the species by increasing late frost damage. Times of the late frost for the duration ranged from one to four for each site. Out of the four sites, late frost reduced tree-ring growth at Tashirotaira. Also, in two areas including Tashirotaira, tree-ring growth correlated with the daily minimum air-temperature after leaf-flushing. The frequency of late frost was so low for the duration that we could not analyze relationship between late frost damage and climate warming.