基于涡度系统的干旱区枣林能量平衡分析  

Using Eddy Covariance Method to Analyze Energy Balance of Jujube Orchard in Arid Areas

作　　者：乔英 张百和 邱凯 王腾飞 QIAO Ying;ZHANG Baihe;QIU Kai;WANG Tengfei(Xinjiang Institute of Technology,Aksu 843100,China)

机构地区：[1]新疆理工学院,新疆阿克苏843100

出　　处：《灌溉排水学报》2023年第8期41-47,62,共8页Journal of Irrigation and Drainage

基　　金：高校科研计划项目(XJEDU2022P135);“两山理论与南疆高质量绿色发展研究中心”科研项目(JDZD202202);新疆理工学院高层次人才项目(XJLG2022G001)。

摘　　要：【目的】揭示干旱区枣林的能量循环与能量变化规律。【方法】利用涡度相关法得到干旱区枣林连续2 a的通量数据,分析了能量变化规律、分配方式以及热存储项能量的日平均变化规律。【结果】①干旱区枣林生态系统的净辐射Rn、潜热通量LE、显热通量H、土壤热通量G在各月份的日均值变化均呈以净辐射变化规律为基础的单峰变化。②干旱区枣林2018年和2019年的整年度30 min尺度能量闭合率为73.45%、73.11%,计入热储存项后,能量闭合率分别提高了3.72%、2.75%,达到了77.17%、75.86%。③干旱区枣林的土壤热储存项日均值在生育期和休眠期变化规律相似;潜热热储存项和显热热储存项在生育期和休眠期变化规律不同;光合热储存项和冠层热储存项在休眠期均为0,但在生育期有典型的日变化。【结论】热存储项对干旱区枣林生态系统的能量平衡闭合程度贡献不大,干旱区枣林的能量分配方案受水分条件、植被类型和气候特征的影响。【Objective】Jujube is an important cash crop in the arid region in northwestern China.Understanding energy dynamics in it is hence crucial to improving water use efficiency.This paper is to analyze the energy balance in a jujube orchard using the eddy covariance.【Method】Flux from a jujube orchard was measured from 2018 to 2019 using the eddy covariance method.The data were used to analyze the patterns and distribution of the energy changes,and daily variations in the thermal storage.【Result】①Daily average energy change in net radiation,latent heat flux,sensible heat flux,and soil heat flux exhibited a single-peaked pattern in each month,primarily driven by net radiation changes.②The annual 30-minute energy balance ratio in 2018 and 2019 was 73.45%and 73.11%,respectively.Incorporating the heat storage term increased the energy balance by 3.72%and 2.75%to 77.17%and 75.86%,respectively,in 2018 and 2019.③The daily change in soil heat storage exhibited similar pattern during the fertility and dormancy stage.Latent and sensible heat storage showed different patterns between fertility and dormancy stage,while photosynthesis and canopy heat storage were zero during the dormancy stage and displayed typical daily variation during the fertility stage.【Conclusion】The thermal storage has a minimal contribution to the energy balance.Thus,the energy allocation to the jujube is influenced mainly by water,vegetation types and climate.

关 键 词：干旱区 枣林 涡度相关法 能量平衡 

分 类 号：S718.5[农业科学—林学]