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

Journal Article · · Tree Physiology
 [1];  [2];  [3];  [4];  [5];  [5];  [5];  [6];  [1];  [7];  [5];  [4]
  1. UNIVERSITY PROGRAMS
  2. BATTELLE (PACIFIC NW LAB)
  3. Oklahoma State University
  4. Chinese Academy of Sciences
  5. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang
  6. National Renewable Energy Laboratory,
  7. Institute of Atmospheric Environment, China Meteorological Administration, Shenyang
+ Show Author Affiliations
Drought and 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 (Dstem) and lower vessel density in leaves (VDvein) 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 (?pd), but not Ksx, indicating that leaves were more sensitive than 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.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1605549
Report Number(s):
PNNL-SA-149619
Journal Information:
Tree Physiology, Journal Name: Tree Physiology Journal Issue: 2 Vol. 40
Country of Publication:
United States
Language:
English

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Related Subjects

Hydraulic conductance
hydraulic architecture
N fertilization
xylem embolism
drought stress
woody plants