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• 研究报告 •    下一篇

元宝枫生长旺季树干液流动态及影响因素

王瑞辉1,2;马履一1;奚如春1;徐军亮1   

  1. 1北京林业大学, 北京 100083;2中南林业科技大学, 长沙 410004
  • 收稿日期:2005-05-20 修回日期:2005-08-10 出版日期:2006-03-08 发布日期:2006-03-08

Fluctuation of Acer truncatum sap flow in rapid growth season and relevant variables

WANG Ruihui1,2;MA Luyi1;XI Ruchun1;XU Junliang1   

  1. 1Beijing Forestry University,Beijing 100083, China;2Central South Unversity of Forestry Technology Technology,410004, China
  • Received:2005-05-20 Revised:2005-08-10 Online:2006-03-08 Published:2006-03-08

摘要: 利用热扩散式边材液流探针和多种气象、土壤因子传感器组成的全自动数据采集系统和美国产Licor-6400光合测定系统,于夏秋季节对北京西山地区低山成林元宝枫单株边材液流动态和叶片蒸腾作用进行了系统观测。元宝枫树干边材液流变化受天气的影响,环境胁迫或环境的改善都能改变边材液流的波动特征。在正常情况下,边材液流的日变化呈单峰曲线:日出后树干液流迅速上升,峰值在中午前后出现,然后下降,在次日早晨前达到坡谷。最热月7月液流启动和进入坡谷的时间比其他各月早1~4 h。6月树干上位液流速率大于中位和下位,其他各月树干下位液流速率大于上位和中位,这种差距在7月达2~3倍。多元回归分析表明,在整个生长旺季,元宝枫边材液流变化深受气温、太阳辐射、空气相对湿度、土壤温度和风速等环境因子的影响,但在不同的观测时段和观测部位其影响的主导因子不完全相同,只有空气温度在任何情况下都是影响液流的主导因子;元宝枫边材液流的变异规律较好地说明了其耐旱的生态策略。

关键词: 日本鳗鲡, 高温季节, 人工控温, 催熟

Abstract: By using auto-data collection system with thermal dissipation sap flow probe,and meteorological,soil and Licor6400 photosynthesis sensors,this paper measured the fluctuations of Acer truncatum sap flow and leaf transpiration in summer and autumn in the West Mountains of Beijing.The fluctuation of sap wood flow was affected by weather.Environmental stress or improvement altered the characters of sap flow wave motion.The daily course of sap flow showed a singlepeaked curve in clear days,i.e.,increased sharply after sunrise,reached the peak around noon,went down then,and reached the valley in next early morning.The starting time of sap flow and the appearing time of valley were 1-4 hours earlier in July than in other months.In June,the sap flow velocity (SFV) of upper trunk was apparently higher than that of middle and lower trunks,whereas in other months,the SFV of lower trunk was higher than that of upper and middle trunks.The difference was 2-3 times in July.Multiple regression analysis showed that SFV was deeply affected by environmental factors,e.g.,air temperature,solar radiation,air humidity,soil temperature and wind speed in the whole growth season,but the main affecting factors were differed with observation period and position,and only atmospheric temperature was always important.The fluctuation of sap flow could better explain the ecological strategy of A.truncatum to drought tolerance.

Key words: Anguilla japonica, High temperature season, Artificially controlling temperature, Maturation induction