树干径向变化对茎液流以及气象因子的响应  被引量:6

Response of Stem Radial Variation That Caused by Sapflow and Meteorological Factors

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作  者:王琛[1] 余新晓[1] 陈丽华[1] 朱建刚[1] 梁启鹏[1] 

机构地区:[1]北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室,北京100083

出  处:《水土保持研究》2010年第1期45-49,55,共6页Research of Soil and Water Conservation

基  金:国家“十一五”科技支撑计划项目(2006BAD03A0201);北京市科委重大项目(D0706001000091)

摘  要:应用改进的SF-L型热扩散式树液流测定装置和DC型植物生长测量仪,结合北京2007年6-10月的气象数据,探讨了北京山区油松、侧柏树干茎周长动态因素与液流速率和气象因子之间的相关关系,并运用树木径向变化周期分段法将树木径向生长量从径向变化过程中分离开,结果表明:(1)油松、侧柏茎周长变化与液流速率的关系显著(P<0.01),油松为正相关,侧柏为负相关。(2)空气水汽压亏缺、日温差、空气湿度和日照时数与油松、侧柏茎周长变化关系显著,但在回归拟合过程中侧柏的解释因子只有空气水汽压亏缺和日平均风速,且解释程度比较低(0.356)。(3)油松、侧柏茎周长生长量的拟合水平较高,且影响气象因子相同,侧柏的液流速率也成为解释因子之一。水汽压亏缺、空气温湿度、日照时数、土壤水势和风速对树木的生长起到决定性的作用。By the Application of improved SF-L type thermal dissipation sap flow velocity measuring device and DC-type plant growth measuring device,with the meteorological data from June to October in 2007 of Beijing,we discussed the relationship between the meteorological factors and the stem perimeter dynamic factors and sap flow velocity of Pinus tabulaeformi,Platycladus orientalis in Beijing mountain areas.Extract radial growth from the stem circadian cycle,by divide the circadian cycle into phases.The results show that:(1)There is remarkable correlation between the sap flow velocity and the stem perimeter(P〈0.01),positive correlation for Pinus tabulaeformis and negative correlation for Platycladus orientalis.(2)The stem perimeter changes is remarkably correlated to air vapor pressure deficit,daily temperature difference,air humidity and sunshine hours.But in the regression fitting,the explanations for Platycladus orientalis only include air vapor pressure deficit and daily wind speed,and in low degree(0.356).(3)In the research of Pinus tabulaeformi and Platycladus orientalis,the fitness of stem perimeter growth is high,meteorological impact factors are identical,and the sap flow velocity in Platycladus orientalis becomes one of the explanations.

关 键 词:树干茎周长变化 树干茎周长生长量 树干液流速率 气象因子 土壤水势 

分 类 号:Q945.17[生物学—植物学] P463.22[天文地球—大气科学及气象学]

 

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