Articles
SAP FLOW TECHNOLOGY USED IN A NON-TRADITIONAL WAY INCLUDING RELATIONS TO TREE STRUCTURE
Article number
951_26
Pages
215 – 223
Language
English
Abstract
We focused on the whole-tree and stand eco-physiology, mostly water relations and structure in forests and orchards.
Two methods for measurements of sap flow were elaborated: trunk heat balance, THB and heat field deformation, HFD. They both were found very suitable for studies of water relations, but they can be also used for quantitative estimates of effective (i.e., function-related) tree structures.
Applied tree water storage was calculated from the difference of sap flow at tree base and transpiration of foliage.
Effective size of tree crowns was estimated on the basis of sap flow daily totals.
Effective form of tree crowns was estimated on the basis of diurnal dynamics of sap flow, when evaluated together with corresponding data of solar radiation (or potential evapotranspiration) introducing radiation data measured on flat horizontal surface, or other spatially pronounced geometrical form, e.g., sphere.
Effective whole tree root system distribution was analyzed by the sap flow radial patterns, distinguishing water, which flows through outer or inner sapwood and comes from superficial or sinker roots respectively.
The aim of most studies done using specialized mobile field instrumentation was to get information important for better understanding of tree eco-physiology, but allowing landscape applications suitable for practical purposes, such as diagnostics or objective background for proper management.
Two methods for measurements of sap flow were elaborated: trunk heat balance, THB and heat field deformation, HFD. They both were found very suitable for studies of water relations, but they can be also used for quantitative estimates of effective (i.e., function-related) tree structures.
Applied tree water storage was calculated from the difference of sap flow at tree base and transpiration of foliage.
Effective size of tree crowns was estimated on the basis of sap flow daily totals.
Effective form of tree crowns was estimated on the basis of diurnal dynamics of sap flow, when evaluated together with corresponding data of solar radiation (or potential evapotranspiration) introducing radiation data measured on flat horizontal surface, or other spatially pronounced geometrical form, e.g., sphere.
Effective whole tree root system distribution was analyzed by the sap flow radial patterns, distinguishing water, which flows through outer or inner sapwood and comes from superficial or sinker roots respectively.
The aim of most studies done using specialized mobile field instrumentation was to get information important for better understanding of tree eco-physiology, but allowing landscape applications suitable for practical purposes, such as diagnostics or objective background for proper management.
Publication
Authors
J. Cermák, N. Nadezhdina
Keywords
sap flow methods, whole tree approach, sap flow derived parameters, water storage, effective root distribution, effective crown size, and effective crown form
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