Review of advances in radial patterns of stem sap flow
树干液流径向分布格局研究进展

Variability in radial patterns of sap flow is the main source of error in evaluating individual and stand transpiration using thermal techniques. Thus, it is necessary to understand and quantify radial patterns of stem sap flow before accurate estimation of forest transpiration can be conducted. We discuss the methods used to determine radial patterns of sap flow and summarize four main patterns of stem sap flow. We also review the effects of inner structure characteristics and environmental factors on radial patterns of sap flow. In addition, we present the diurnal and seasonal variability in radial patterns of sap flow. Lastly, we propose possible problems in resent research on radial patterns of stem sap flow.