基于整树称重法的Granier经验公式对毛白杨树干液流测定的适用性  

Adaptability of Granier empirical formula in sap flow measurement of Populus tomentosa based on whole tree weighing method

作　　者：马玉洁 武鹏飞 王晓 张劲松[2] 尹昌君[2] 马长明[1] MA Yu-jie;WU Peng-fei;WANG Xiao;ZHANG Jin-song;YIN Chang-jun;MA Chang-ming(College of Forestry,Hebei Agricultural University,Baoding 071000,Hebei,China;Research Institute of Forestry,Chinese Academy of Forestry,Bei-jing 100091,China)

机构地区：[1]河北农业大学林学院,河北保定071000 [2]中国林业科学研究院林业研究所,北京100091

出　　处：《应用生态学报》2020年第5期1518-1524,共7页Chinese Journal of Applied Ecology

基　　金：国家重点研发计划项目(2016YFC0500101)资助。

摘　　要：为了评估Granier经验公式在树干液流测定中的适用性,以毛白杨为对象,利用热扩散式探针法(TDP)测定树木的液流速率,以整树称重法进行同步测定,对比分析Granier经验公式在毛白杨树干液流测定中是否存在误差,并对整树称重法测定的蒸腾速率与热扩散法测定的温差系数K进行幂指数回归拟合,建立校正的Granier公式。结果表明:与整树称重法测定的蒸腾速率相比,通过Granier经验公式计算的液流速率低估了67.7%;建立了毛白杨的Granier校正公式Fd=0.0135K0.6952(R2=0.77),校正后Granier公式的计算结果与整树称重法测定的蒸腾速率相比仅降低了3.4%,具有较好的一致性。因此,采用Granier经验公式计算毛白杨树干液流速率需进行校正。We evaluated the adaptability of Granier’s empirical formula in the measurement of trunk sap flow in Populus tomentosa. The thermal diffusion probe method(TDP) was used to mea-sure sap flow rate, and the whole tree weighing was simultaneously measured for each tree. We compared results from the Granier empirical formula with that from the whole tree weighing to find out whether Granier formula had any error in measuring the trunk sap flow of P. tomentosa. The transpiration rate by the whole tree weighing method and the temperature difference coefficient K by the thermal diffusion method were fitted with power exponential regression to establish a corrected Granier formula. Compared with the transpiration rate measured by the whole tree weighing method, sap flow rate calculated by the Granier empirical formula was underestimated by 67.7%. Therefore, a calibrated Granier correction formula of P. tomentosa was established: Fd=0.0135K0.6952(R2=0.77). The calculated result from this calibrated formula was only 3.4% lower than the transpiration rate estimated with the whole tree weighing method, which showed good consistency. Thus, the calculation of the P. tomentosa sap flow rate should be corrected when using the Granier empirical formula.

关 键 词：毛白杨 Granier经验公式 热扩散式探针 树干液流 

分 类 号：S792.117[农业科学—林木遗传育种]