绦柳树干液流变化及其影响因子研究  

Variation of stem sap flow of Salix matsudana and its impact factors

作　　者：陈崇[1] 李吉跃[1] 王玉涛[1] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室

出　　处：《北京林业大学学报》2008年第4期82-88,共7页Journal of Beijing Forestry University

基　　金：北京市科技计划项目(D0605001040191);北京林业大学省部共建森林培育与保护教育部重点实验室课题(JD100220535)

摘　　要：该文于2006年4—11月利用Granier热扩散探针观测了绦柳的树干液流速率在生长季节的动态变化,并利用全自动气象站同步监测了环境因子。观测结果显示,在土壤水分充足的8月份,绦柳树干平均液流速率为0.0041cm/s,液流峰值为0.0146 cm/s;而在相对干旱的5月份平均液流速率为0.000503 cm/s,液流峰值为0.00347 cm/s;土壤水分充足时期液流速率明显高于相对干旱期。在整个生长季节,绦柳液流速率日变化均为明显的单峰曲线,5—11月份各月的峰值分别为0.0028、0.0024、0.0048、0.0086、0.0061、0.0058、0.0042 cm/s,启动时间和达到峰值时间具有明显的规律性;以太阳辐射强度、气温、空气湿度、风速、不同层次土温等环境因子作为自变量,以边材液流速率作为因变量,经过逐步回归,建立了绦柳液流速率与环境因子的多元线性模型,回归方程极显著,其主要影响因子为空气温度、空气相对湿度和太阳辐射强度。By means of Granier＇s thermal dissipation probe and micro-meteorological station, daily meteorological factor and stem sap flow velocity （SFV） of Salix matsudana were measured from April to November in 2006. Results show that in the August, the average SFV was 0.004 1 cm per second, and the peak velocity was 0. 014 6 cm per second. In the May, the average SFV was 0.000 503 cm per second and the peak velocity was 0.003 47 cm per second. SFV in sufficient soil water supply period is higher than in deficient soil water supply period. In whole growing season,the curve of SFV is an obvious single peak. From May to November, SFV was 0.002 8 cm per second, 0.002 4 cm per second, 0.004 8 cm per second, 0.008 6 cm per second, 0.006 1 cm per second, 0.005 8 cm per second, 0. 004 2 cm per second, respectively. There is an obvious regularity at start-up and peak of SFV. Taking solar radiation intensity, air temperature, air humidity, wind speed and soil temperature as independent variables and SFV as dependent variable, by stepwise regression, multiple linear equation of SFV and environmental factors are established. The equation is significant and the principal impact factors are air temperature, air relative humidity and solar radiation intensity.

关 键 词：绦柳 树干液流速率 影响因子 

分 类 号：S792.12[农业科学—林木遗传育种]