绒毛白蜡展叶期树干液流及其影响因子研究  

Study on SAP flow and its influencing factors of Fraxinus velutina in leaf-spreading stage

作　　者：邓炜展 苏雨 窦占宁 韩叙 白浩荣 贺露露 罗欢 吴海龙[1] Deng Weizhan;Su Yu;Dou Zhanning;Han Xu;Bai Haorong;He Lulu;Luo Huan;Wu Hailong(Tianjin University of Technology,Tianjin 300384,China)

机构地区：[1]天津理工大学环境科学与安全工程学院,天津300384

出　　处：《南方林业科学》2022年第4期11-16,23,共7页South China Forestry Science

基　　金：大学生创新创业训练计划项目资助(项目编号:202010060095);国家自然科学基金青年项目“重构松散堆积体径流侵蚀对植物群落结构的响应机制”(项目编号:41907047)。

摘　　要：为了解树木在展叶期树干液流变化情况,加深对树木耗水量的认识,本研究以干旱半干旱地区常见的城市绿化树种绒毛白蜡为例,采用热扩散探针法(TDP)结合自动气象站等设备,对绒毛白蜡树干液流、气象因子和土壤因子等进行同步监测。研究结果表明:展叶后期树木的液流启动时间及到达峰值的时间均早于展叶前期,且展叶后期液流速率显著高于展叶前期。晴天夜间(20:00-次日5:00)液流速率表现为前半夜(20:00-24:00)液流速率大于后半夜(0:00-5:00),雨天夜间液流速率维持在较低水平,但波动较强烈。绒毛白蜡展叶后期树干液流活动较展叶前期活跃,夜间液流主要集中在前半夜,且夜间液流整体呈速率下降趋势。展叶期的液流速率与气象因子的时滞性存在动态变化,展叶前期绒毛白蜡液流速率与空气温度、土壤温度具有较高同步性,与风速主要存在滞后效应,在展叶后期液流速率与风速具有较高同步性,置前于空气温度、土壤温度。展叶期与大气压强主要存在置前效应,与光合有效辐射主要存在滞后效应,与相对湿度、土壤含水量成反向同步。液流速率与空气温度、光合有效辐射、土壤温度(P<0.01)和风速呈显著正相关,与大气压强、相对湿度和土壤含水量呈显著性负相关(P<0.01)。The purpose of the experiment is to understand the change of sap flow of trees in leaf-spreading period and to deepen the comprehension of water consumption of trees.This study took Fraxinus velutina,a common urban greening tree species in arid and semi-arid areas,as the object of study,using thermal diffusion probe method(TDP)combined with automatic weather station and other equipment,the stem sap flow,meteorological factors and soil factors of Fraxinus velutina were monitored synchronously.The results show that the start time and peak time of sap flow in late leaf-spreading period were earlier than that in early leaf-spreading period,and the sap flow rate in late leaf-spreading period was significantly higher than that in early leaf-spreading period.In sunny days,the sap flow rate shows a single peak or multi-peak trend,the sap flow rate in daytime is higher than that at night,but the data at night is not 0.In rainy days,the diurnal variation of sap flow rate is not obvious,and the diurnal sap flow rate is low.On clear day night(20:00-5:00 the next day)the sap flow rate shows that in the first half of the night(20:00-24:00)the sap flow rate is higher than in the second half of the night(0:00-5:00).On rainy day,the sap flow rate remains at a low level,but the fluctuation is strong.The activity of sap flow of F.velutina was more active in the late leaf-spreading period than in the early leaf-spreading period.Nocturnal fluid flow was mainly concentrated in the early night,and the overall rate of it decreased.There is a dynamic change between the liquid flow rate and the time lag of meteorological factors during leaf-spreading period.In the early leaf-spreading period,the flow rate of F.velutina have a high synchronization with air temperature and soil temperature,and have a lag effect with wind speed.In the late leaf-spreading period,the liquid flow rate and wind speed have high synchronization,and are ahead of air temperature and soil temperature.During the leaf-spreading stage,Fraxinus velutina had a preposition

关 键 词：树干液流 土壤含水量 展叶期 夜间液流 绒毛白蜡 

分 类 号：S715.4[农业科学—林学] Q945.171[生物学—植物学]