Combining sap flow measurement-based canopy stomatal conductance and ^(13)C discrimination to estimate forest carbon assimilation
Combining sap flow measurement-based canopy stomatal conductance and ^(13)C discrimination to estimate forest carbon assimilation作者机构：South China Institute of Botany Chinese Academy of Sciences Guangzhou 510650 China CSIRO Plant Industry Darwin Laboratory PMB44 Winnellie. NT 0822. Australia
出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)
年 卷 期：2005年第50卷第18期
页 面：2021-2027页
核心收录：
学科分类：09[农学] 0903[农学-农业资源与环境]
基 金：supported by the National Natural Science Foundation of China(Grant Nos.30428022&30270239) the Natural Science Foundation of Guangdong Province(Grant No.031265) the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant Nos.KSCX2-SW-133&KZCX-SW-01-01B-05) the Knowl-edge Innovation Foundation of South China Institute of Botany(Grant No.20022110) Wang Kuan Cheng Education Foundation
摘 要：The available methods for studying C uptake of forest and their problems in practices are reviewed, and a new approach to combining sap flow and 13C techniques is proposed in this paper. This approach, obtained through strict mathematic derivation, combines sap flow measure-ment-based canopy stomatal conductance and 13C discrimi-nation to estimate instantaneous carbon assimilation rate of a forest. Namely the mean canopy stomatal conductance (gc) acquired from accurate measurement of sap flux density is integrated with the relationship between 13C discrimination (?) and Ci/Ca (intercellular/ambient CO2 concentrations) and with that between Anet (net photosynthetic rate) and gCO2 (stomatal conductance for CO2) so that a new relation be-tween forest C uptake and ? as well as gc is established. It is a new method of such kind for studying the C exchange be-tween forest and atmosphere based on experimental ecology.
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