基于波文比系统的巨菌草蒸散发过程及影响因素  

Evapotranspiration dynamics of Cenchrus fungigraminus based on Bowen ratio system and its influencing factors

作　　者：刘凤山 白妮妮[1] 林占熺 林冬梅[2] 王培丹[3] 苏德伟 LU Fengshan;BAI Nini;LIN Zhanxi;LN Dongmei;WANG Peidan;SU Dewei(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;China National Engineering Research Center of JUNCAO Technology,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Shunchang County No.1 Middle School,Nanping,Fujian 353200,China)

机构地区：[1]福建农林大学林学院,福建福州350002 [2]福建农林大学国家菌草工程技术研究中心,福建福州350002 [3]顺昌县第一中学,福建南平353200

出　　处：《福建农林大学学报（自然科学版）》2023年第2期258-264,共7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)。

摘　　要：基于波文比系统研究了巨菌草生育盛期的蒸散发(ET)动态及影响因素.结果表明,波文比趋于-1时的不同异常值判定范围显著影响潜热和显热通量,使用预测均值匹配和随机森林两种方法对异常值进行插补均可得到有效的完整序列.净辐射、潜热通量、显热通量和土壤热通量的平均值分别为111.35、81.55、32.28和-2.72 W·m^(-2).ET日均值为-0.12~5.31 mm,平均值为2.88 mm.ET小时动态均为单峰变化过程,晴天和阴天条件下的峰值分别为0.6和0.3 mm.利用逐步回归方法得到的巨菌草ET气象影响因素可以解释95%的变化.巨菌草生育盛期的作物系数为1.67,解释率为87%.Evaporation and transpiration(ET) dynamics and its influencing factors at the vigorous growth stage of Cenchrus fungigraminus were studied using Bowen ratio system. The results showed that outlier ranges significantly affected latent and sensible heat fluxes when Bowen ratio approached-1, and both interpolation methods(predictive mean matching and random forest imputations) can be used to interpolate outliers to obtain effective complete sequences. The mean values of net radiation, latent heat, sensible heat and soil heat fluxes were 111.35, 81.55, 32.28 and-2.72 W·m^(-2), respectively. The daily mean ET rate fluctuated from-0.12 to 5.31 mm, with an average of 2.88 mm. Furthermore, hourly dynamics of ET was characterized by single peaks of 0.6 and 0.3 mm in sunny and cloudy weather conditions, respectively. Stepwise regression method showed that 95% of the variations were attributed to meteorological factors. The crop coefficient of C.fungigraminus reached 1.67 in the vigorous growth period, with an explanation rate of 87%.

关 键 词：蒸散发 波文比 能量平衡 巨菌草 

分 类 号：S181[农业科学—农业基础科学]