Articles
LONG-TERM WATER USE EFFICIENCY OF YOUNG SPRUCE FOREST
Article number
951_35
Pages
293 – 299
Language
English
Abstract
Long-term water use efficiency (WUE) describes water utilization by plants on different levels of biosphere organization.
We have performed a WUE evaluation in two young spruce forests of different stand densities, sparse (FS) and dense (FD) from 1998 to 2003. WUE in this study was calculated as a ratio of total aboveground biomass increment (TB) and transpiration (T) on annual time scale.
Two approaches were used for total biomass evaluation: i) TBI – from stem diameter at the breast height (DBH) increment dynamic and its allometry with TB, and ii) TBII – as a sum of leaf, branch and stem biomass.
Growth dynamic of branch biomass was related to tree height increment and leaf biomass to the leaf area index.
TBI was found significantly higher than TBII in FD. However, WUE was not significantly different among the stands and approaches.
WUE with TBI (WUEI) used were 4.30 g/L and 4.68 g/L in FS and FD, WUE with use TBII (WUEII) 4.17 g/L and 4.14 g/L in FS and FD, respectively.
WUE of FS and FD was similar due to the identical climate conditions, stand age and genetic origin of the trees.
We can recommend TBI approach due to lower instrumentation demands and accurate results in the same time.
We have performed a WUE evaluation in two young spruce forests of different stand densities, sparse (FS) and dense (FD) from 1998 to 2003. WUE in this study was calculated as a ratio of total aboveground biomass increment (TB) and transpiration (T) on annual time scale.
Two approaches were used for total biomass evaluation: i) TBI – from stem diameter at the breast height (DBH) increment dynamic and its allometry with TB, and ii) TBII – as a sum of leaf, branch and stem biomass.
Growth dynamic of branch biomass was related to tree height increment and leaf biomass to the leaf area index.
TBI was found significantly higher than TBII in FD. However, WUE was not significantly different among the stands and approaches.
WUE with TBI (WUEI) used were 4.30 g/L and 4.68 g/L in FS and FD, WUE with use TBII (WUEII) 4.17 g/L and 4.14 g/L in FS and FD, respectively.
WUE of FS and FD was similar due to the identical climate conditions, stand age and genetic origin of the trees.
We can recommend TBI approach due to lower instrumentation demands and accurate results in the same time.
Publication
Authors
R. Slípková, R. Pokorný
Keywords
transpiration, total aboveground biomass increment, growth dynamic
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