侧柏树干边材液流的空间变化规律及其相关因子

doi:10.11707/j.1001-7488.20060704

林业科学 ›› 2006, Vol. 42 ›› Issue (7): 21-27.doi: 10.11707/j.1001-7488.20060704

侧柏树干边材液流的空间变化规律及其相关因子

王华田¹ 赵文飞¹ 马履一²

1山东农业大学林学院,泰安271018；2.北京林业大学资源与环境学院,北京100083

收稿日期:2004-07-08 修回日期:2006-05-12 出版日期:2006-07-25 发布日期:2006-07-25

Spatial Variation of Sap Flow of Platycladus orientalis and Its Affecting Factors

Wang Huatian¹,Zhao Wenfei¹,Ma Lüyi²

1.Forestry College of Shandong Agricultural University Tai'an 271018; 2.College of Resources and Environment, Beijing Forestry University Beijing 100083

Received:2004-07-08 Revised:2006-05-12 Online:2006-07-25 Published:2006-07-25

摘要/Abstract

摘要：

利用树干边材液流探针(TDP)和微型自动气象站对北京西山地区侧柏人工林树干秋季不同高度、不同方位、不同径阶边材液流及相关环境因子日周期变化动态进行连续观测,对环境因子与边材液流速率的相关性进行分析。结果表明:同一立木,树干上位边材液流启动早,上升快,到达峰值后随即急剧下降;树干下位边材液流启动时间明显推迟,且上升和下降缓慢;二者之间最大液流速率相差2倍以上。树干不同方位边材液流速率日变化进程有差异,其中南侧树干边材液流速率很低,北侧、西侧和东侧3个方位液流速率较高,边材液流速率与测定部位的边材宽度和冠幅关系不明确。单株树干边材液流速率与树干冠幅、树干直径和边材面积相关不显著,但液流通量随直径的增大而增大,不同径阶单木液流通量波动规律不尽相同。侧柏林分内部环境因子日周期变化规律明显,边材液流速率与主要环境因子相关显著,其中边材液流速率与空气湿度呈负相关,各径阶表现出相同的趋势;边材液流速率与太阳辐射强度和空气温度之间存在极显著的相关性,胸径大的立木呈正相关,胸径小的单株呈负相关;风速对边材液流速率有较大影响;20～40cm土壤层温度对树木耗水有显著的影响,大径阶立木表现为负相关,小径阶立木表现为正相关。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自变量,以边材液流速率作因变量,经过逐步回归,建立侧柏边材液流速率与环境因子的多元线性模型,回归方程极显著。

关键词: 侧柏, 边材液流速率, 空间变化, 环境因子, 相关分析

Abstract:

By means of sap flow measurement technique with thermal diffusion probe and micro-meteorological station, daily meteorological factors and sap flow of Platycladus orientalis both at different trunk height, in different trunk direction and different diametric singletrees were measured in the Western Mountain of Beijing. Relations between sap flow velocity (SFV) and environmental factors, such as solar radiation intensity, air temperature, air humidity, wind speed and soil temperature, were also analyzed. Result showed that, SFV in upper trunk sapwood was much higher, with an early start_up and a fast ascendant, but descended steeply after got the peak in the late morning and 2 times higher than that in lower trunk sapwood. SFV both in eastern, northern and western orientation in trunk sapwood was similar and much higher than that in southern direction, and there was no certain relation between SFV and its corresponding sapwood width and crown dimension. Singletree sap flow verified according to trunk diameters that large trees sap flow was higher than that of small ones. Daily environmental factors under canopy verified regularly and had a correlation with sap flow significantly. SFV of all the diametric sample trees had a minus correlation with air humidity. And SFV of large trees had a positive relation with solar radiation intensity and air temperature, but small trees were inverse, significantly. Wind speed had an important effect on sap flow conductance. 20～40 cm layer soil temperature had a significant impact on trees water consumption that SFV of large trees was minus related to soil temperature but SFV of small trees was positive. Taking solar radiation intensity, air temperature, air humidity, wind speed, and soil temperature in 5～60 cm as independent variable and SFV as dependent, by stepwise regressing, multiple linear equation was established with a significant regression test.

Key words: Platycladus orientalis, sap flow velocity, spatial variation, environmental factor, correlative analysis

王华田赵文飞马履一. 侧柏树干边材液流的空间变化规律及其相关因子[J]. 林业科学, 2006, 42(7): 21-27.

Wang Huatian;Zhao Wenfei;Ma Lüyi. Spatial Variation of Sap Flow of Platycladus orientalis and Its Affecting Factors[J]. Scientia Silvae Sinicae, 2006, 42(7): 21-27.

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侧柏树干边材液流的空间变化规律及其相关因子

Spatial Variation of Sap Flow of Platycladus orientalis and Its Affecting Factors

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