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Leaf hydraulic traits of larch and ash trees in response to long-term nitrogen addition in northeastern China.
- Source :
- Journal of Plant Ecology; Dec2021, Vol. 14 Issue 6, p1105-1114, 10p
- Publication Year :
- 2021
-
Abstract
- Aims Atmospheric nitrogen (N) deposition influences tree hydraulic architecture and thus the growth and survival; but the responses of leaf hydraulic traits remain uncertain, and may vary with species or plant functional types. Methods We used the 16-year N addition experiment (10 g N m<superscript>−2</superscript> year<superscript>−1</superscript>) on Fraxinus mandshurica (ash, broadleaf angiosperm) and Larix gmelinii (larch, conifer gymnosperm) plantations in northeastern China and examined the effect of N addition on their leaf hydraulics. We measured the leaf pressure–volume traits by the bench drying method and quantified the maximum leaf hydraulic conductance (K <subscript>leaf_max</subscript>) and resistance to embolism (P <subscript>50leaf</subscript>) by the timed rehydration method. Important Findings Larch had higher K <subscript>leaf_max</subscript> and stronger drought tolerance (i.e. lower relative water content at turgor loss point (RWC<subscript>tlp</subscript>) and modulus of elasticity (ε), and more negative P <subscript>50leaf</subscript>) than ash. N addition increased the leaf osmotic potential at turgor loss (π <subscript>tlp</subscript>) and full turgor (π <subscript>0</subscript>), and leaf capacitance (C <subscript>leaf_mass</subscript>) for ash but not for larch, indicating that ash is more sensitive to N addition. N addition consistently increased K <subscript>leaf_max</subscript> and P <subscript>50leaf</subscript> values for both species. π <subscript>tlp</subscript> and π <subscript>0</subscript> were positively while C <subscript>leaf_mass</subscript> was negatively correlated with leaf density (LD) for ash. K <subscript>leaf_max</subscript> was positively but P <subscript>50leaf</subscript> was negatively related with LD for larch. There were negative relationships between K <subscript>leaf_max</subscript> and P <subscript>50leaf</subscript> for both species. Overall, our findings suggest that long-term N addition decreases the leaf drought tolerance for these two important tree species, which improve the understanding of the tree hydraulic performance under N deposition. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17529921
- Volume :
- 14
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Plant Ecology
- Publication Type :
- Academic Journal
- Accession number :
- 154713977
- Full Text :
- https://doi.org/10.1093/jpe/rtab054