Climatic signal in a radial growth of Canadian and Maximovich poplars in south-western Poland

ABSTRACT: The main goal set by researchers in this article was to gather knowledge on the structure of the basic biometric features of tree-rings of two species of poplars, belonging to different sections of Aegeiros – Populus xcanadensis and Tacamahaca – Populus maximowiczii, and to define and understand the correlation between weather and annual increment. A supplementary objective of the article was to determine pointer years of species found in individual populations. Our research used the standard methodology applied in dendroclimatology. In the analysis of correlation of the tree species studied, stronger statistically significant relationships were obtained in terms of precipitation-increment compared to temperature-increment. The annual increment in the Canadian poplar was enhanced by wet autumns and winters, especially by the rainfall in Oct and Dec in the previous year, as well as in Apr of this year. The tested Maximovich's poplars tested preferred rainfall during spring going into summer, especially in June of this year. Seven specific pointer years were determined for the Canadian poplar, comprising 4 positive (1987, 2008, 2010, 2012) and 3 negative years (2000, 2011, 2014). For P. maximowiczii, 11 pointer years were determined, i.e. 5 positive years (1987, 1991, 1999, 2009, 2012) and 6 negative (1984, 2000, 2002, 2010, 2013, 2015). In the pointer years, monthly sums of atmospheric precipitation and the average monthly air temperatures differed from the multi-year period. In the process of forming the secondary growth of the wood of the studied poplar species, the predominant role was played by atmospheric precipitation.

摘要：本文研究者的核心目标为，获取两类隶属于不同黑杨组（Aegeiros）的杨树的树木年轮基本生物特征结构相关知识，所涉物种分别为加拿大杨（Populus xcanadensis）与青杨组（Tacamahaca）的大叶杨（Populus maximowiczii），并明确解析气象因子与树木年生长量之间的相关性。本文的补充研究目标为，确定各对应种群中物种的指示年。本研究采用树木年代气候学（dendroclimatology）领域的标准研究方法。在供试树种的相关性分析中，降水与生长量的统计学显著相关性强于气温与生长量的相关性。加拿大杨的年生长量可因湿润的秋季与冬季得到促进，尤以研究年份前一年10月、12月的降水，以及当年4月的降水作用最为显著。供试的大叶杨偏好春末至夏季时段的降水，尤以当年6月的降水为甚。研究为加拿大杨确定了7个特定指示年，其中4个为正生长年（1987、2008、2010、2012），3个为负生长年（2000、2011、2014）。针对大叶杨，研究共确定了11个指示年，即5个正生长年（1987、1991、1999、2009、2012）与6个负生长年（1984、2000、2002、2010、2013、2015）。在这些指示年中，月大气降水总量与月平均气温均偏离多年平均值。在供试杨树的木材次生生长过程中，大气降水发挥了主导作用。