当前位置: X-MOL 学术J. Plant Ecol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Leaf hydraulic traits of larch and ash trees in response to long-term nitrogen addition in northeastern China
Journal of Plant Ecology ( IF 2.7 ) Pub Date : 2021-05-26 , DOI: 10.1093/jpe/rtab054
Ying Jin 1, 2 , Chuankuan Wang 1, 2 , Zhenghu Zhou 1, 2 , Jiacun Gu 2, 3
Affiliation  

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−2 year−1) 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 (Kleaf_max) and resistance to embolism (P50leaf) by the timed rehydration method.
Important Findings
Larch had higher Kleaf_max and stronger drought tolerance (i.e., lower relative water content at turgor loss point (RWCtlp) and modulus of elasticity (ε), and more negative P50leaf) than ash. N addition increased the leaf osmotic potential at turgor loss (πtlp) and full turgor (π0), and leaf capacitance (Cleaf_mass) for ash but not for larch, indicating that ash is more sensitive to N addition. N addition consistently increased Kleaf_max and P50leaf values for both species. πtlp and π0 were positively while Cleaf_mass was negatively correlated with leaf density (LD) for ash. Kleaf_max was positively but P50leaf was negatively related with LD for larch. There were negative relationships between Kleaf_max and P50leaf 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.
更新日期:2021-05-26
down
wechat
bug