秋冬季节大叶女贞枝干液流的动态特征  

Dynamics of Sap Flow in Ligustrum lucidum Ait in Bough and Branches during Autumn and Winter

作　　者：田璐洋[1] 李春友[1] 张劲松[2] 孟平[2] 高峻[2] 

机构地区：[1]河北农业大学,保定071000 [2]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,北京100091

出　　处：《中国农业气象》2011年第2期203-207,共5页Chinese Journal of Agrometeorology

基　　金："十一五"国家林业科技支撑计划专题(2006BAD03A0505)

摘　　要：利用热扩散(TDP)等观测技术,于2009年秋季和初冬季(9-12月)在河南省济源市黄河小浪底森林生态系统定位研究站对大叶女贞主干和分枝液流速率的关系进行了研究,试验取3个分枝进行液流测定,枝干直径大小顺序为主干>分枝1>分枝3>分枝2。结果表明:(1)大叶女贞的主干和各分枝液流的日变化均为单峰曲线,观测期内主干与分枝液流速率的变化规律一致,主干与各个分枝液流速率的相关性在0.01水平上达到极显著,相关系数分别为0.997、0.933和0.997;(2)主干的液流峰值明显大于各分枝,这与主干向各分枝提供水分的事实相符;(3)各分枝的液流峰值和平均液流速率表现为分枝1>分枝3>分枝2,这与分枝枝条的直径大小排序一致,说明枝条越粗液流速率越大,而与分枝的方位关系不明显;(4)分枝2的直径最小,液流速率的变化规律不明显,说明分枝的直径越小对环境变化的响应能力越弱;(5)连续晴天各分枝的液流速率之和与主干的液流速率在量值上相近,且二者变化规律相同;(6)外界因素对各分枝液流速率影响比对主枝影响大,降水后温度、太阳辐射越低各个分枝液流恢复正常所需的时间也就越长。The relationship of sap flow in Ligustrum lucidum Ait between bough and branches was analyzed by using TDP（Thermal Dissipation Sapwood Flow Velocity Probe） method from September to December,2000 in Xiaolangdi ecological station,Henan province.The diameters of branches ranked as boughbranch 1#branch 2#branch 3#.The Results showed that the diurnal variation of sap flow of changed as a single-peak curve both for bough and branches,and velocity variation kept same too.There was significant correlation between bough and branches with r1 =0.997,r2 =0.933,r3 =0.997.The peak sap flow in bough was higher than branches,and the peak sap flow and average velocity of branches ranked as 1#3#2#.Velocity of branch 2 changed little just because of its small diameter.The sap flow sum of branches was similar to that of bough at consecutive sunny days.Branches had greater impact from outside factors than bough.Lower temperature and less solar radiation need more time for sap flow recovering after rain.

关 键 词：秋季和初冬季 大叶女贞 热扩散 枝干液流速率 

分 类 号：S792.95[农业科学—林木遗传育种]