摘要
基于波文比—能量平衡法,研究了巨菌草生长过程入射太阳辐射(Rd)、反射太阳辐射(Ru)、净辐射(Rn)、潜热(LH)、显热(SH)、土壤热通量(G)和波文比(β)等的变化动态;通过耦合系数(Ω)评价地表能量通量的影响因素,提出一种地表通量异常值插值方法的判断标准,确定β异常值为-2.00~-0.50.结果表明:采用随机森林插值方法可获得质量良好的通量数据.生育期Rd、Ru、Rn、LH、SH、G、β和Ω的平均值分别为185.99 W·m^(-2)、72.56 W·m^(-2)、111.35 W·m^(-2)、82.94 W·m^(-2)、31.26 W·m^(-2)、-2.72 W·m^(-2)、0.38和0.6,Rd是季节尺度上其他参数变化的主要影响因子,LH和SH同时受到冠层导度(gc)和饱和水汽压差(VPD)等因素的影响.晴天Rn、LH和SH较高,阴天Rn、LH和SH较低.晴天和阴天的β由gc和Rn决定,生育早期具有低gc和高Rn的特征,晴天的β大于阴天;生育盛期具有高gc和低Rn的特征,晴天的β低于阴天.
Based on Bowen ratio-energy balance method,the incident solar radiation(Rd),reflect solar radiation(Ru),net radiation(Rn),latent heat(LH),sensible heat(SH),soil heat flux(G)and Bowen ratio(β=SH/LH)were analyzed during the growth of Giant Juncao(Cenchrus fungigraminus),and the factors affecting surface energy flux were evaluated by coupling coefficient(Ω).The results provided a judgment standard for the interpolation method of surface flux outlier.Theβoutliers were estimated to range from-2.00 to-0.50,indicating that good flux data can be obtained by random forest interpolation method.The averages of Rd,Ru,Rn,LH,SH and G during the entire growth stage were 185.99,72.56,111.35,82.94,31.26,-2.72 W·m^(-2),withβandΩbeing 0.38 and 0.6,respectively.Rd was the main factor affecting other parameters at the seasonal scale,and LH and SH were restricted by canopy conductance(gc)and saturated vapor pressure deficit(VPD).Rn,LH and SH values were relatively higher in the sunny days while lower in the cloudy days.Moreover,the relationship ofβbetween sunny and cloudy days depended on gc and Rn:the early growth stage was featured by lower gc and higher Rn values,with higherβin the sunny days than that in the cloudy days;at the vigorous growth stage,gc witnessed an uprising trend while Rn followed a downward trend,with lowerβin the sunny days.
作者
刘凤山
白妮妮
林占熺
林冬梅
王子怡
丁凰文
吴宗楠
张雅婷
杨谨宁
王培丹
LIU Fengshan;BAI Nini;LIN Zhanxi;LIN Dongmei;WANG Ziyi;DING Huangwen;WU Zongnan;ZHANG Yating;YANG Jinning;WANG Peidan(National Engineering Research Center of JUNCAO Technology,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;College of Life Sciences,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Shunchang No.1 Middle School,Nanping,Fujian 353200,China)
出处
《福建农林大学学报（自然科学版）》
CSCD
北大核心
2023年第3期383-390,共8页
Journal of Fujian Agriculture and Forestry University:Natural Science Edition
基金
福建省科技厅重大专项(2021NZ029009)
福建省自然资源厅项目(KKY22003XA)
福建省农业农村厅项目(KKY22001XA)
福建农林大学项目(XKJC-712021030)。
关键词
巨菌草
地表能量平衡
波文比
潜热比例
Cenchrus fungigraminus
surface energy balance
Bowen ratio
latent heat proportion
