107杨夜间液流变化规律及其影响因子

Change Law of Populus×euramericana′s Sap Flow at Night and Its Influencing Factors

为了实现杨树的精准灌溉,本研究以107杨为研究对象,采用热扩散探针法(TDP)配合小型自动气象站的方法,对107杨的树干液流及气象因子进行了同步监测,统计分析了其夜间树干液流变化规律以及影响因子。结果表明,白天(5:00—20:00)液流呈现单峰多峰的趋势,且液流速率值较大,夜间(20:00至次日5:00)液流速率值很小,但不为0;夜间树干液流前半夜(0:00之前)呈下降趋势,且下降速率由快到慢,后半夜(0:00之后)液流速率呈上升趋势,且上升速率较慢;夜间树干液流只与风速表现出了显著正相关性,相关系数为0.080,而与其他因子均未表现出显著相关性。

In order to realize precision irrigation of poplar,Populus×euramericana was took as research object,and the stem sap flow and the meteorological factors were simultaneously detected continuously with the thermal dissipation probe(TDP)and automatic miniature weather station,then the change of sap flow and its influencing factors were analyzed in this paper.The results showed that the sap flow showed a single peak or multi-peak,and the sap flow velocity was bigger in daytime(5:00-20:00);the value was smaller but not zero at night(20:00-5:00).The sap flow showed a descending trend before midnight(before 0:00),and the descending speed changed from fast to slow;the sap flow showed a increasing trend after midnight(after 0:00),and the increasing speed was slower.There was a significant positive correlation between the sap flow velocity and wind speed with correlation coefficient 0.080,and the correlation was not significant between the sap flow velocity and other meteorological factors.