树木蒸腾耗水测算技术的比较研究*

Abstract

Abstract:

A study on comparison of five methods for the transpiration water-comsumption conducted in poplar plantation in Shandong province (Populus deltoides cv."Lux"ex.Ⅰ-69/55) and Ningxia Autonomous Region (Populus opera) from 1989 to 1991.The five measuring methods are whole-tree potometer, quick-weighing method, LI-1600 porometer, heat pulse technique and Penman-Monteith method.The results of the study are as follows:(1) Supposing that the relative value of daily transpiration waterconsumption per tree measured with whole-tree potometer is 100%, the relative value measured by quick-weighing method is 130%-140%, the relative value measured with LI-1600 porometer is 291% and the relative value measured by heat pulse technique is 90.14%.(2) Supposing that the relative value of the daily transpiration water-consumption per tree measured by heat pulse technique is 100%, the relative value measured by quick-weighing method is 88% in 6-year-old tree and 112% in 2-year-old tree.(3) The value measured with LI-1600 porometer is 30%-90% higher than that measured by quick-weighing method in Ningxia arid zone and 140%-220% higher than that in more humid area of Shandong Province.(4) The value measured by Penman-Monteith method is very close to that measured with whole-tree potometer and that measured by heat pulse technique with errors less than 2%.

Key words: Transpiration, Water-consumption of tree, Technique for measuring transpiration, Whole-tree potometer, Heat pulse techniquee

Fengjue Liu,Shikai Zheng,Guansheng Ju,WRN Edwards,Yande Wu. A STUDY ON COMPARISON OF MEASURING WATER-CONSUMPTION FOR TRANSPIRATION IN POPLAR[J]. Scientia Silvae Sinicae, 1997, 33(2): 117-126.

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A STUDY ON COMPARISON OF MEASURING WATER-CONSUMPTION FOR TRANSPIRATION IN POPLAR

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