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Title: Guidelines and considerations for designing field experiments simulating precipitation extremes in forest ecosystems

Journal Article · · Methods in Ecology and Evolution
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  1. University of New Hampshire
  2. Northern Research Station, USDA Forest Service, New Hampshire
  3. Boston University
  4. Indiana University-Bloomington
  5. Cornell University
  6. University of Illinois
  7. City College of New York
  8. Centre for Ecological Research and Forestry Applications (CREAF)
  9. Oak Ridge National Laboratory
  10. Plymouth State University
  11. Colorado State University
  12. BATTELLE (PACIFIC NW LAB)
  13. Australian National University
  14. Indiana University—Bloomington
  15. University of New Mexico
  16. USDA Forest Service, Northern Research Station - Vermont
  17. ORNL
  18. Northern Research Station, USDA Forest Service - New Hampshire

1. Precipitation regimes are changing in response to climate change, yet understanding of how forest ecosystems respond to extreme droughts and pluvials remains incomplete. As future precipitation extremes will likely fall outside the range of historical variability, precipitation manipulation experiments (PMEs) are critical to advancing knowledge about potential ecosystem responses. However, few PMEs have been conducted in forests compared to short-statured ecosystems, and forest PMEs have unique design requirements and constraints. Moreover, past forest PMEs have lacked coordination, limiting cross-site comparisons. Here, we review and synthesize approaches, challenges, and opportunities for conducting PMEs in forests, with the goal of guiding design decisions, while maximizing the potential for coordination. 2. We reviewed 63 forest PMEs at 70 sites world-wide. Workshops, meetings, and communications with experimentalists were used to generate and build consensus around approaches for addressing the key challenges and enhancing coordination. 3. Past forest PMEs employed a variety of study designs related to treatment level, replication, plot and infrastructure characteristics, and measurement approaches.Important considerations for establishing new forest PMEs include: selecting appropriate treatment levels to reach ecological thresholds; balancing cost, logistical complexity, and effectiveness in infrastructure design; and preventing unintended water subsidies. Response variables in forest PMEs were organized into three broad tiers reflecting increasing complexity and resource intensiveness, with the first tier representing a recommended core set of common measurements. 4. Differences in site conditions combined with unique research questions of experimentalists necessitate careful adaptation of guidelines for forest PMEs to balance local objectives with coordination among experiments. We advocate adoption of a common framework for coordinating forest PME design to enhance cross-site comparability and advance fundamental knowledge about the response and sensitivity of diverse forest ecosystems to precipitation extremes.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1557682
Report Number(s):
PNNL-SA-144418
Journal Information:
Methods in Ecology and Evolution, Vol. 9, Issue 12
Country of Publication:
United States
Language:
English

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Data from: Guidelines and considerations for designing field experiments simulating precipitation extremes in forest ecosystems dataset January 2019

Cited By (5)

Short-term effects of drought on tropical forest do not fully predict impacts of repeated or long-term drought: gas exchange versus growth journal October 2018
Drought Differentially Affects Growth, Transpiration, and Water Use Efficiency of Mixed and Monospecific Planted Forests journal February 2019
Experimental Design and Sample Preparation in Forest Tree Metabolomics journal November 2019
Data from: Guidelines and considerations for designing field experiments simulating precipitation extremes in forest ecosystems dataset January 2019
How ecologists define drought, and why we should do better journal July 2019


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