中国农业气象

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生长季大叶女贞树干液流的径向分布特征

刘超;李春友;张劲松;孟平;贾长荣;   

  1. 河北农业大学;中国林业科学研究院林业研究所/国家林业局林木培育重点实验室;国有济源市大沟河林场;
  • 出版日期:2011-04-10 发布日期:2011-04-10
  • 基金资助:
    “十一五”国家林业科技支撑计划专题(2006BAD03A0505)

Radial Variation of Sap Flow in Ligustrum lucidum Ait During Growing Season

LIU Chao1,LI Chun-you1,ZHANG Jin-song2,MENG Ping2,JIA Chang-rong3(1.Hebei Agricultural University,Baoding 071000,China;2.Research Institute of Forestry,CAF/Key Laboratory of ForestSilviculture of the State Forestry Administration,Beijing 100091;3.Dagouhe National Forest Farm of Jiyuan,Jiyuan 454650)   

  • Online:2011-04-10 Published:2011-04-10

摘要: 采用根据热平衡原理设计的热扩散探针(TDP),于2010年5-10月在河南省济源市的黄河小浪底森林生态系统定位研究站对大叶女贞径向10mm、20mm、30mm深度处的树干液流进行连续监测,并分析大叶女贞径向不同深度液流的变化规律及其与各气象因子的关系。结果表明:(1)大叶女贞在整个生长季南北方位径向液流速率平均值沿边材从外到内均呈现"低-高-低"的分布特点,即Fs_20>Fs_30>Fs_10。(2)不同月份,南北方位不同深度液流速率月平均值在整个生长季变化趋势基本一致,南面为6月>7月>8月>9月>10月>5月,北面为7月>6月>8月>9月>10月>5月。(3)在整个生长季,三种典型天气春季液流速率都是Fs_10>Fs_20>Fs_30,夏秋季都是Fs_20>Fs_30>Fs_10。径向上液流启动时间都是Fs_10>Fs_20>Fs_30,停滞时间绝大多数为Fs_30>Fs_20>Fs_10,即越靠近形成层其启动时间越早,停滞时间越晚。(4)在日变化和季节变化上,三个深度的变化趋势基本一致。晴天,春季液流速率日变化均呈现尖峰形曲线,夏季呈现宽峰形,秋季呈现双峰形;多云天气,春夏秋液流速率日变化均呈现多峰形曲线。夏季树干液流启动时间早于春秋,停滞时间晚于春秋,因此,夏季液流高峰持续时间均长于春秋季,即夏季液流速率的曲线峰形明显宽于春秋季。

关键词: 大叶女贞, 液流, 径向变化

Abstract: The radial variation of sap flow in Ligustrum lucidum Ait trunk and the relationship with meteorological factors was analyzed based on the data,which has been monitored sap flow at 10mm,20mm,30mm Ligustrum lucidum Ait trunk by TDP(Thermal Dissipation Sapwood Flow Velocity Probe) method from May to October,2010 in Xiaolangdi ecological station,Henan province.The results showed that the average sap flow velocity of Ligustrum lucidum Ait changed as "low-high-low" during growing season on the south and north of the tree,Fs_20>Fs_30>Fs_10.The trends of average sap flow velocity at three depth were basically the same on south and north in different months.June>July>August>September>October>May for south and July>June>August>September>October>May for north.The sap flow velocity in three typical was Fs_10>Fs_20>Fs_30 in spring,Fs_20>Fs_30>Fs_10 in summer and autumn.The starting time of sap flow was Fs_10>Fs_20>Fs_30,the pausing time was Fs_30>Fs_20>Fs_10 during growing season.The closer point was to cambium,the earlier the sap flow started and the later paused.The trends of sap flow velocity in daily and seasonal variability were all similar at different depths.The sap flow velocity at different depths showed sharp-peak,wide-peak,double peaks curves in spring,summer and autumn respectively in sunny days,and all showed multi-peak curves in cloudy days.The starting time of sap flow in summer was earlier than that in spring and autumn,and the pausing time was later than that in spring and autumn.Therefore,the peak duration of sap flow in summer was longer than that spring and autumn,and the curve was wider than that in spring and autumn.

Key words: Ligustrum lucidum Ait, Ligustrum lucidum Ait, Sap flow, Radial variation