荒漠绿洲区新疆杨蒸腾耗水特性研究  

Transpiration and water consumption characteristics of Populus alba in desert oasis area

作　　者：宋金堆 肖辉杰[1,3] 辛智鸣 罗成威[1,2] 贾肖肖 SONG Jindui;XIAO Huijie;XIN Zhiming;LUO Chengwei;JIA Xiaoxiao(College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083;Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station,National Forestry and Grassland Administration,Dengkou O15200;State Key Laboratory of Efficient Production of Forest Resources,Beijing Forestry University,Beijing 100083;Experimental Center of Desert Forestry,Chinese Academy of Forestry,Dengkou 015200,China)

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]内蒙古磴口荒漠生态系统国家定位观测研究站,磴口015200 [3]北京林业大学林木资源高效生产全国重点实验室,北京100083 [4]中国林业科学研究院沙漠林业实验中心,磴口015200

出　　处：《干旱区资源与环境》2024年第7期162-171,共10页Journal of Arid Land Resources and Environment

基　　金：省级其他科研项目(2022YFHH0065);国家重点研发计划项目(2023YFE0121800)资助。

摘　　要：为探究荒漠绿洲区新疆杨单木液流特征并估算其林带耗水量,文中监测新疆杨液流和环境因子,并将激光雷达点云提取的林木参数与日蒸腾量拟合。结果表明:新疆杨液流速率随胸径增加而增大,其日变化为“昼高夜低”的多峰曲线,5-9月平均液流速率为0.0015-0.0026 g·cm^(-2)·s^(-1)。日尺度下,太阳辐射是新疆杨液流速率变化的主要影响因子;月尺度下,新疆杨液流速率变化的主要影响因子为水汽压亏缺。基于激光雷达点云可以提取林木参数。林木胸径、边材面积、叶面积均与其日蒸腾量拟合较好(R^(2)>0.950),通过胸径、边材面积、叶面积估算5-9月林带的耗水量为967.70-1029.65mm。In order to explore the sap flow characteristics of the single tree of Populus alba and estimate the water consumption of P.alba shelterbelt in desert oasis area,in this study,the sap flow of P.alba and environmental factors were monitored,and the forest parameters extracted from the light detection and ranging(LiDAR)point clouds were fitted with the daily transpiration.The results showed that the sap flow speed of the tree increased with the increase of diameter at breast height(DBH),and its diurnal variation was a multimodal curve of"higher in daytime and lower in night".From May to September,the average sap flow speeds were 0.0015~0.0026g·cm^(-2)·s^(-1).On the diurnal scale,solar radiation was the main factor influencing the sap flow speed of P.alba.On the monthly scale,vapor pressure deficit(VPD)was the main factor influencing the sap flow speed of the tree.Forest parameters can be extracted based on LiDAR point clouds.The DBH,sapwood area and leaf area of forest were well fitted with their daily transpiration(R^(2)>0.950).The water consumption of the shelterbelt from May to September was 967.70~1029.65mm estimated by DBH,sapwood area and leaf area.

关 键 词：新疆杨 蒸腾耗水 荒漠绿洲区 

分 类 号：Q945.17[生物学—植物学]