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Persistence and Plasticity in Conifer Water–Use Strategies

Journal Article · · Journal of Geophysical Research. Biogeosciences
DOI:https://doi.org/10.1029/2018jg004845· OSTI ID:1826747
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. Univ. of Illinois, Chicago, IL (United States); University of Illinois at Chicago
  2. Rocky Mountain Biological Lab., Gothic, CO (United States); Oregon State Univ., Corvallis, OR (United States)
  3. Univ. of Illinois, Chicago, IL (United States)
  4. Stanford Univ., CA (United States); Univ. of Massachusetts, Amherst, MA (United States)
  5. United States Geological Survey, Denver, CO (United States)
  6. Desert Research Inst., Reno, NV (United States)
  7. Northern Arizona Univ., Flagstaff, AZ (United States)
  8. Rocky Mountain Biological Lab., Gothic, CO (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
The selective use of seasonal precipitation by vegetation is critical to understanding the residence time and flow path of water in watersheds, yet there are limited datasets to test how climate alters these dynamics. Here, we use measurements of the seasonal cycle of tree ring δ18O for two widespread conifer species in the Rocky Mountains of North America to provide a multi-decadal depiction of the seasonal origins of forest water use. The results show that while the conifer tree stands had a dominant preference for use of snowmelt, there were multi-annual periods over the last four decades when use of summer precipitation was preferential. Utilization of summer rain emerged during years with increased snowfall and tree growth, suggesting that summer rain enhanced the transpiration stream only during the periods of highest water use. We hypothesize this could be explained through shallowing of the root profile during wetter periods and/or through the influence of changing water table depths on the residence time of summer precipitation in the root zone. We suggest the tree ring proxy approach used here could be applied in other watersheds to provide critical insight into the temporal dynamics of plant water use that could not be inferred from short measurement campaigns. Furthermore, these data on the seasonal origins of forest water are critical for understanding forest vulnerability to drought, the processes that affect precipitation pathways and residence time in watersheds and the interpretation of tree ring proxy data.
Research Organization:
Univ. of Illinois, Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0019210; AC02-05CH11231
OSTI ID:
1826747
Alternate ID(s):
OSTI ID: 1600566
Journal Information:
Journal of Geophysical Research. Biogeosciences, Journal Name: Journal of Geophysical Research. Biogeosciences Journal Issue: 2 Vol. 125; ISSN 2169-8953
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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