Title: Divergences in hydraulic conductance and anatomical traits of stems and leaves in three temperate tree species coping with drought, N addition and their interactions

Abstract

Abstract Drought and nitrogen (N) addition have been shown to affect tree hydraulic traits, but few studies have been made on their interactions across species with different wood types or leaf forms. We examined the responses of hydraulic conductance and xylem anatomical traits of Quercus mongolica (ring porous with simple leaves), Fraxinus mandshurica (ring porous with compound leaves) and Tilia amurensis (diffuse porous with simple leaves) to drought, N addition and their interactions. Drought stress decreased current-year xylem-specific conductivity in stems (Ksx) and leaf hydraulic conductance (Kleaf ), but N addition affected Ksx and Kleaf differently among species and watering regimes. These divergent effects were associated with different responses of anatomical traits and leaf forms. Higher mean vessel diameter in stems and lower vessel density in leaves were observed with N addition. The three-way interactive effects of drought, N addition and tree species were significant for most values of anatomical traits. These results were also reflected in large differences in vessel diameter and density among species with different wood types or leaf forms. The two-way interactive effects of drought and N addition were significant on Kleaf and predawn water potential, but not Ksx, indicating that leaves were more sensitive thanmore » stems to a combination of drought stress and N addition. Our results provide mechanistic insight into the variable responses of xylem water transport to the interactions of drought and N availability.« less

Authors:

Zhang, Hongxia ^[1]; McDowell, Nate G. ^[2]; Adams, Henry D. ^[3]; Wang, Anzhi ^[4]; Wu, Jiabing ^[4]; Jin, Changjie ^[4]; Tian, Jinyuan ^[1]; Zhu, Kai ^[1]; Li, Weibin ^[5]; Zhang, Yushu ^[6]; Yuan, Fenghui ^[4]; Guan, Dexin ^[4]

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+ Show Author Affiliations

1. Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China, University of Chinese Academy of Sciences, Beijing 100049, China
2. Atmospheric Sciences & Global Change, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
3. Department of Plant Biology, Ecology and Evolution, Oklahoma State University, Stillwater, OK 74078-3013, USA
4. Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
5. State Key Laboratory of Grassland and Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
6. Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China

Publication Date:

2019-12-20

Sponsoring Org.:

USDOE

OSTI Identifier:

1602293

Alternate Identifier(s):

OSTI ID: 1595492

Resource Type:

Published Article

Journal Name:

Tree Physiology (Online)

Additional Journal Information:

[Journal Name: Tree Physiology (Online) Journal Volume: 40 Journal Issue: 2]; Journal ID: ISSN 1758-4469

Publisher:

Oxford University Press

Country of Publication:

United Kingdom

Language:

English