气候变化后杉木人工林单木径向生长规律研究

以福建将乐1982年人工栽植的杉木成熟林为研究对象,用树木年轮学方法,比较不同年份区间各样地内杉木平均生长速率的差异,通过划分人工杉木林单木径向生长阶段,并判定生长释放过程,揭示杉木人工林单木径向生长规律.结果表明：在1992-1996年各样地内杉木年平均生长速率显著高于其他年份区间（p＜0.05）,且JL3样地显著低于其他样地（p＜0.05）;杉木的生长过程可划分为快速生长期（1～6 a）、慢速生长期（7～15a）、稳定生长期（16 a以上）3个阶段;杉木连年生长量平均为8.38 mm/a,在6a时达到峰值,22 a达到数量成熟,呈现连年生长量逐年增加的趋势,达到生长量峰值和数量成熟的年龄有所提前;杉木在快速生长期内（1986年左右）和1994年以及2005年前后出现生长突变,在1984-1986年杉木出现35％以上的中度释放,其与林窗的形成有关,而1994年和2005年前后杉木的生长释放与近年来降水变化趋势有一定关系.

Study on Regularity of Radial Growth of Cunninghamia lanceolata Plantations After Climate Change

Dendrochronology method was applied to compare the difference in the average growth rate of Cunninghamialanceolata in different sample plots in varied years by taking the mature C.lanceolata plantation on Jiangle Forest Farm,Fujian Province established in 1982 as study object.The regularity of the radial growth of C.lanceolata was studied by classifying the radial growth stage of the individual plant,and by identifying the growth release process.The results showed that the average growth rates during 1992-1996 in five plots were all significantly higher than those of other time periods （p 〈0.05）,while the average growth rate of JL3 plot in that time duration was much lower than that of the other sample plots （p 〈0.05）.The growth course of C.lanceolata could be divided into three stages,i.e.,the rapid growth stage（1-6 a）,slow growth stage（7-15 a） and stable growth period （16 a above）.The average annual radial growth rate of C.lanceolata was 8.38 mm/a,which reached the peak value at 6 a and matured at 22 a.There was a tendency that the annual growth rate increased gradually.There were mutational growth within the rapid growth period （around 1986,in the year of 1994 and 2005）.An over 35% of medium-level growth release took place between 1984-1986,which might be caused by the formation of forest gaps.However,the growth releases happened in 1994 and 2005were related to the increase of precipitation in these years. Keywords：Cunninghamia lanceolata ; radial growth ; growth rate ; growth stage classification ; growth release