文献类型：期刊文献

中文题名：基于侧柏液流的测定对Granier原始公式系数进行校正

英文题名：Calibration coefficients of Granier original formula based on sap flow of Platycladus orientalis

作者：刘庆新[1,2,3] 孟平[1,2,3] 张劲松[2,3] 高峻[2,3] 孙守家[2,3] 任迎丰[4]

第一作者：刘庆新

机构：[1]中国林业科学研究院;[2]中国林业科学研究院林业研究所;[3]国家林业局林木培育重点实验室;[4]济源市国有大沟河林场

年份：2013

卷号：33

期号：6

起止页码：1944-1951

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家"十二五"科技支撑课题(2011BAD38B06);林业公益性行业科研专项(201104009-04);林业科技创新平台项目(2012-LYPT-DW-004)资助

语种：中文

中文关键词：Granier原始公式;液流;热消散法;侧柏

外文关键词：Granier original formula; sap flow; thermal dissipation method; Platycladus orientalis

分类号：S791.254

摘要：为研究Granier原始公式计算单株树木蒸腾耗水量的准确性,以侧柏作为研究对象,采用热消散方法测定在15、30、50、70和90 cm水柱高度形成不同压力梯度下的树干液流通量密度,并以称重法作为对照,利用回归分析方法拟合称重法测定的液流通量密度与热消散法测定的树干液流温差系数(K值),进而建立校正公式。结果表明:基于侧柏校正的Granier公式为Fd=0.0115K0.5581(R2=0.8319)。与称重法测定的液流通量密度相比,校正的Granier公式计算的结果略高(6.70±0.02)%,而Granier原始公式计算的则低估(78.53±0.04)%。由此可知,采用校正的Granier公式计算侧柏的液流通量密度具有较高的精度。
Thermal dissipation method has important advantages over other techniques for measuring tree and bush transpiration, which can distinguish between plant and soil evaporation, and can be used to measure transpiration of different species in a mixed plant stand. Hence, the method has been widely applied by tree physiologists and forest hydrologists. An important potential limitation, however, is that the calibration of the Granier＇s experiential formula is based on an empirical relationship between temperature difference and sap flux density, rather than on the physical properties of heat transfer in sapwood. In order to study the accuracy of Granier＇s empirical formula in calculating transpiration water consumption of individual tree, eight Platycladus orientalis trees were selected as representative diffuse-porous to validate the accuracy of Granier＇s empirical formula in Xiaolangdi forest ecosystem research station of state forestry administration from May to June in 2011. The sap flux densities of P. orientalis under different pressure at water column heights of 15, 30, 50, 70 and 90 cm were measured by thermal dissipation method and compared with weighing method. The relationship between sap flux density of P. orientalis and temperature difference＇s coefficient （K） obtained using regression analysis method was established. The results showed that corrected Granier formula was Fd=0.0115K0.5581 （R2=0.8319） based on individual P.orientalis. the calibrated Granier formula was obviously different from Granier＇s original formula （Fd=0.0119K1.231 （R2=0.96））. The coefficient α（0.0115） of corrected Granier formula was similar to that of the Granier＇s original formula, but the coefficient β0.5581） of the corrected Granier formula was one order of magnitude smaller than that of Granier＇s empirical formula, and their quantitative difference was 54.66%. Compared with the sap flux density measured by weighing method under different pressure at water column heights of 15, 30, 50, 70 and 90 cm, the average values of the corrected Granier formula was （6.70±0.02）% higher, while the average values of original Granier formula was （78.53±0.04）% lower, indicating that estimations of sap flux density of individual P. orientalis by corrected Granier formula were of higher precision. Therefore, the corrected Granier formula would be apply to calculate sap flux density of P. orientalis. Nevertheless, an error-modified formula based on thermodynamics theory must be provided to ensure the accuracy of sap flux density derived from the original Granier empirical formula.