水热耦合对沈阳地区油松木质部生长的影响  

Effects of moisture and heat coupling on xylem growth of Pinus tabuliformis in Shenyang,China

作　　者：刘伟韬 李俊霞[1,3] 赵莹 韩勍[1] 侯森 张敬远 李丰 陈振举 LIU Weitao;LI Jun-xia;ZHAO Ying;HAN Qing;HOU Sen;ZHANG Jing-yuan;LI Feng;CHEN Zhen-ju(Tree-Ring Laboratory,College of Forestry,Shenyang Agricultural University,Shenyang 110866,China;College of Forestry,Bejing Forestry University,Beijing 100083,China;College of Horticulture,Shenyang Agricultural University,Shenyang 110866,China;Qingyuan Forest CERN,Chinese Academy of Sciences,Shenyang 110164,China;Key Laboratory of Desert and Desertification,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]沈阳农业大学林学院,树木年轮实验室,沈阳110866 [2]北京林业大学林学院,北京100083 [3]沈阳农业大学园艺学院,沈阳110866 [4]中国科学院清原森林生态系统观测研究站,沈阳110164 [5]中国科学院沙漠与沙漠化重点实验室,兰州730000

出　　处：《应用生态学报》2021年第10期3468-3476,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41871027,41888101,31570632)资助。

摘　　要：利用微树芯技术可以从细胞尺度研究树木形成层物候和径向生长的过程,揭示树木生长与气候的关系。油松是我国北方森林的建群树种之一,也是沈阳地区的优势树种。研究2020年整个生长季(4—11月)油松周尺度的形成层及木质部细胞变化,分析油松在沈阳地区的生长规律。结果表明:油松形成层分裂活动开始于4月初,结束于9月末。木质部从扩大细胞出现(4月中旬)开始生长,到木质化细胞消失(10月下旬)结束,其生长符合"S"型曲线。2020年生长53个/列木质部细胞,最大生长速率(0.55个/列/d)出现在5月末,早晚材细胞于7月末发生转变。在沈阳地区最低温达到0℃以上时树木形成层开始活动,影响木质部生长开始和结束的最低临界温度为2~3℃。降水在油松整个生长过程中起到促进作用。沈阳地区7月末的高温和水分供给不足是木质部细胞分化形成早晚材的主要因子。Based on the micro-core technology,we can accurately examine the tree cambium phenology and the radial growth at the cellular scale,and reveal the relationship between tree growth and climate.Pinus tabuliformis is one of the constructive species in forests of northern China.We investigated the growth pattern of P.tabuliformis in Shenyang and the changes in cambium and xylem cells throughout the growing season(April to November)in 2020.Results showed that the dividing activity in cambium started in early April and ended at the end of September.Xylem began to grow from the appearance of enlargement cells(mid April)to the end of the disappearance of lignified cells(late October),with a growth trajectory of‘S’shape curve.Approximately 53 xylem cells per row in radical direction were produced in 2020.The maximum growth rate(0.55 ind/row/day)occurred at the end of May,while the change of earlywood and latewood cells occurred at the end of July.When the minimum temperature above 0℃in Shenyang,the cambium began to divide.The minimum critical temperature that affected the beginning and ending of xylem growth was 2-3℃.Precipitation promoted the growth in the growing season.The high temperature and insufficient water supply at the end of July were the main factors driving the differentiation of xylem cells to form earlywood and latewood.

关 键 词：油松 形成层物候 木质部 水热因子 

分 类 号：S791.254[农业科学—林木遗传育种]