Basal area growth and mortality of Betula maximowicziana affected by crown dieback in a secondary forest in Hokkaido, northern Japan
Basal area growth and mortality of Betula maximowicziana affected by crown dieback in a secondary forest in Hokkaido, northern Japan
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DOI：
10.1007/s10310-008-0103-7
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发表时间：
2009-02
影响因子：
1.5
通讯作者：
Yasuyuki Ohno;K. Umeki;I. Watanabe;M. Takiya;K. Terazawa;M. Yasaka;S. Matsuki
中科院分区：
文献类型：
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作者：
Yasuyuki Ohno;K. Umeki;I. Watanabe;M. Takiya;K. Terazawa;M. Yasaka;S. Matsuki
自20世纪90年代末以来，B.在日本北方北海道各地的成熟次生林中观察到maximowiczianaRegel。研究了一种适合于大材种生产的疏伐方法。maximowicziana，我们测量断面积生长和死亡率的217个树木在4年期间（1999-2003年），在一个90岁的次生林严重的树木损害。我们分析了生长和死亡率的关系的程度冠顶枯（DC），对称和不对称的竞争，从邻居，和初始树的大小。个体断面积增长下降，增加DC，增加对称（双侧）的竞争，并降低初始树的大小。在四年的时间里，观察到的树木中有4.1%死亡。Logistic回归分析显示，死亡率随着DC的增加和对称竞争的增加而增加。这些结果表明，生长率和死亡率都受到相同因素的影响（即，DC和对称竞争）。我们的结论是，在研究地点，个体竞争的资源是地下的，最有可能是水。模拟的生长率和死亡率可用于改善受损森林的管理。提出了受损研究中心的管理计划。
Since the late 1990s, decline ofB. maximowiczianaRegel has been observed in mature secondary forests in various parts of Hokkaido, northern Japan. To develop a method of thinning for large-timber production ofB. maximowicziana, we measured basal area growth and the mortality of 217 trees during a four-year period (1999–2003) in a 90-year-old secondary forest with serious tree damage. We analyzed growth and mortality in relation to the degree of crown dieback (DC), symmetric and asymmetric competition from neighbors, and initial tree size. Individual basal area growth decreased with increasing DC, with increasing symmetric (two-sided) competition, and with decreasing initial tree size. During the four-year period, 4.1% of the observed trees died. Logistic regression analysis revealed that mortality rate increased with increasing DC and with increasing symmetric competition. These results suggest that both growth and mortality rates were affected by the same factors (i.e., DC and symmetric competition). We concluded that the resource for which individuals were competing at the study site was underground, most likely water. Modeled growth and mortality rates can be used to improve the management of damaged forests. A management plan for the damaged study site is proposed.