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Acclimation of leaf hydraulic conductance and stomatal conductance ofPinus taeda(loblolly pine) to long-term growth in elevated $CO_{2}$(free-air $CO_{2}$enrichment) and N-fertilization
| Content Provider | Scilit |
|---|---|
| Author | Domec, Jean-Christophe Palmroth, Sari Ward, Eric Maier, Chris A. Thérézien, M. Oren, Ram |
| Copyright Year | 2009 |
| Description | Journal: Plant, cell & environment We investigated how leaf hydraulic conductance $(K_{leaf}$) of loblolly pine trees is influenced by soil nitrogen amendment (N) in stands subjected to ambient or elevated $CO_{2}$ concentrations (CO_{2}$^{a}$ and CO_{2}$^{e}$, respectively). We also examined how $K_{leaf}$ varies with changes in reference leaf water potential $(Ψ_{leaf-ref}$) and stomatal conductance $(g_{s-ref}$) calculated at vapour pressure deficit, D of 1 kPa. We detected significant reductions in $K_{leaf}$ caused by N and CO_{2}$^{e}$, but neither treatment affected pre-dawn or midday $Ψ_{leaf}$. We also detected a significant CO_{2}$^{e}$-induced reduction in $g_{s-ref}$ and $Ψ_{leaf-ref}$. Among treatments, the sensitivity of $K_{leaf}$ to $Ψ_{leaf}$ was directly related to a reference $K_{leaf}$ $(K_{leaf-ref}$ computed at $Ψ_{leaf-ref}$). This liquid-phase response was reflected in a similar gas-phase response, with $g_{s}$ sensitivity to D proportional to $g_{s-ref}$. Because leaves represented a substantial component of the whole-tree conductance, reduction in $K_{leaf}$ under CO_{2}$^{e}$ affected whole-tree water use by inducing a decline in $g_{s-ref}$. The consequences of the acclimation of leaves to the treatments were: (1) trees growing under CO_{2}$^{e}$ controlled morning leaf water status less than CO_{2}$^{a}$ trees resulting in a higher diurnal loss of $K_{leaf}$; (2) the effect of CO_{2}$^{e}$ on $g_{s-ref}$ was manifested only during times of high soil moisture. |
| Related Links | https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3040.2009.02014.x |
| Ending Page | 1512 |
| Page Count | 13 |
| Starting Page | 1500 |
| e-ISSN | 13653040 |
| DOI | 10.1111/j.1365-3040.2009.02014.x |
| Journal | Plant, cell & environment |
| Issue Number | 11 |
| Volume Number | 32 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2009-10-08 |
| Access Restriction | Open |
| Subject Keyword | Journal: Plant, cell & environment Reference Conductances Reference Leaf Water Potential Time Constant Turgor Loss Point |
| Content Type | Text |
| Resource Type | Article |
