冀中平原速生杨树干液流特征及驱动因子对其影响  

Characteristics of Sap Flow in Fast-growing Poplar and Its Response to Driving Factors in the Central Hebei Plain

作　　者：屈柏林 郭延朋 杨晶雯 吕康乐 马长明[2] Qu Bailin;Guo Yanpeng;Yang Jingwen;LV Kangle;Ma Changming(Mulanweichang National Forest Farm of Hebei Province,Chengde 068450,P.R.China;Agricultural University of Hebei Province)

机构地区：[1]河北省木兰围场国有林场,承德068450 [2]河北农业大学林学院

出　　处：《东北林业大学学报》2020年第12期18-22,共5页Journal of Northeast Forestry University

基　　金：国家重点研发计划课题(2016YFD0600401)。

摘　　要：为揭示冀中平原区速生丰产林的水分消耗规律。以107速生杨为研究对象,采用大型桶栽方式培育,利用热扩散式茎流计,在2018年生长季对3种水分梯度的速生杨进行了树干液流监测,同步测定有辐射强度(Rs)、空气温度(Ta)、相对湿度(RH)等气象因子。结果显示:107速生杨树干液流存在明显的昼夜变化规律,呈现典型“单峰型”特征,峰值出现在午后13:00—15:00,夜间也存在液流波动,主要出现在前半夜,且变动幅度较低,夜间树干液流贡献率占全天的1.9%~4.0%;速生杨树干液流存在时滞效应,液流速率与20 min前Rs和50、60、80 min后的RH、饱和水汽压(VPD)、Ta相关性最大;速生杨树干液流速率与V PD呈现“迟滞回环”的关系,呈明显顺时针方向,而与R s间的响应过程则未表现出明显的回环关系,树干液流受Rs、Ta、RH和VPD的影响较大;土壤水分从耗水总量的角度对树干液流产生影响,低土壤水分水平下,树干液流受到土壤水分制约,其峰值水平明显低于中土壤水分和高土壤水分,仅为他们的25.2%~42.9%,呈现树干液流启动晚,峰值出现早,结束提前的特征。因此,分不同水分条件,并将各驱动因子经时滞错位后,构建树干液流回归模型,更能对冀中平原速生丰产林的水分管理提供精准指导。In order to reveal the water consumption law of fast-growing and high-yield forest in the plain area of central Hebei.The 107-speed poplar was used as the research object,and it was cultivated by large-scale barrel cultivation,The thermal diffusion sap flow meter was used to monitor the stem flow of fast-growing poplars with three kinds of water gradient of radiation intensity(Rs),air temperature(Ta),and relative humidity(RH)in the 2018 growing season and meteorological factors.The 107-speed poplar sap flow has obvious diurnal variation,showing a typical“single-peak”characteristic.The peak appears at 13:00-15:00 in the afternoon.There are fluctuation at night,mainly in the first half of the night,and the fluctuation range is low.The contribution rate of sap flow at night accounts for 1.9%-4.0% of the whole day.There is a time lag effect in the sap flow of fast-growing poplar,and the sap flow rate is the most correlated with R s before 20 min and R H,saturation vapour pressure(VPD),and Ta after 50,60 and 80 min.The relationship between the sap flow rate of fast-growing poplar and VPD showed“hysteresis loops”,which showed an obviously clockwise direction,while the response process with Rs showed no obvious loop relationship.The sap flow is greatly affected by Rs,Ta,RH and VPD.Soil moisture affects sap flow from the perspective of total water consumption.Under low soil moisture levels,sap flow is restricted by soil moisture,and its maximum sap flow rate level is significantly lower than medium soil moisture and high soil moisture,only 25.2%-42.9% of theirs,showing the characteristics of the sap flow started late,the maximum sap flow appeared early,and the end was advanced.Therefore,according to different water conditions and the displacement of the driving factors by time delay,a regression model of stem sap flow was established,which can provide accurate guidance for the water management of the fast-growing and high-yield forest in the central Hebei.

关 键 词：速生杨 树干液流 驱动因子 

分 类 号：S718.4[农业科学—林学]