摘要
采用热平衡包裹式树干液流仪（stem heat balance,SHB）监测沙冬青（Ammopiptanthus mongolicus）茎干液流日变化,并利用自动气象站同步监测太阳辐射、空气温度、空气相对湿度、风速等气象因子日变化,研究沙冬青茎干液流在不同季节和天气条件下的日变化特征及其与环境气象因子的关系.研究表明：（1）在夏季沙冬青茎干液流昼夜区别明显,且变幅较大,液流于8：00~9：00开始启动,并迅速于9：00左右达到峰值,然后立即有一个大幅度的下降,后在小幅度波动中维持到19：00左右停止;沙冬青茎干液流在夜间较弱;（2）不同天气条件对沙冬青液流的变化影响较大,沙冬青茎干液流速率的总体变化幅度表现为晴天〉阴天〉沙尘天气;（3）各季节典型天气下沙冬青茎干液流速率表现为夏季〉春季〉冬季;生长季茎干液流启动时间早,液流量大;春季液流启动时间次之,液流量变化平缓,维持时间长;冬季液流启动时间最迟,液流变化速率大且维持时间短;（4）沙冬青茎干液流与气象因子的关系密切,其中与太阳辐射的关系最为密切,其次是空气温度和相对湿度,影响最小的是风速.
The diurnal and seasonal variations of sap flow of Ammopiptanthus mongolicus were measured with Stem Heat Balance that was produced by the Dynamax company of Australian,At the same time,the simultaneous weather factors were observed at a nearby automatic weather station,and the correlations between sap flow and each meteorological factor were analyzed.The results showed that：（1）It is obvious that the difference of sap flow is significance in the summer season,and the amplitude is big.The sap flow start at 8：00~9：00,then it rise rapidly,and it reached their peaks at 9：00,after then it has a large scale drop immediately,and sap flow stop at 19：00 after a small fluctuation.The sap flow is weak at night;（2）The different weather conditions have great influence on the sap flow of A.mongolicus.The sap flow of A.mongolicus overall change tendency for ranked as sunny day〉cloudy day〉sand storm weather by analyzing three typical weather conditions;（3）The sap flow of A.mongolicus were measured in typical weather of the spring and the winter separately in summer.The results indicated the sap flow is summer〉spring〉winter.The sap flow start in the morning in summer with high flow quantity.The starting time of sap flow is the secondary in spring with a stable variation,and the hold time is long,the starting time of sap flow in winter is latest,and the variation of sap flow changes rapidly,and the hold time is short;（4）The relation between sap flow of A.mongolicus and the meteorological factor are close through analyzing the both,and the sap flow quantity of the A.mongolicus and meteorological factor＇s relevant was：the solar radiation〉the air temperature〉the air relative humidity〉the wind speed in turn.
出处
《西北植物学报》
CAS
CSCD
北大核心
2011年第5期1003-1010,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(30960321
30872069)
国家公益性行业(林业)科研专项(200804031)
国家农转资金(2010GB2G100489)
关键词
干旱荒漠区
沙冬青
茎干液流
变化特征
气象因子
arid desert area
Ammopiptanthus mongolicus
sap flow
change characteristics
meteorological factor
