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European Journal of Forest Research

, Volume 135, Issue 3, pp 417–431 | Cite as

Forest observational studies: an alternative to designed experiments

  • K. von GadowEmail author
  • Xiu Hai Zhao
  • V. P. Tewari
  • Chun Yu Zhang
  • Ashwani Kumar
  • Jose Javier Corral Rivas
  • Rajesh Kumar
Assmann Review

Abstract

With Ernst Assmann’s appointment to the chair of Forest Yield Science in Munich in 1951, he assumed responsibility for the maintenance of the extensive network of growth-and-yield plots of the Bavarian Forest Research Institute. This network, with some plots having been remeasured since 1870, proved to be a rich source of observations, and constituted the empirical basis for Assmann’s fundamental theories in production ecology. Realizing the strategic value of long-term field observations, scientists are using (a) designed experiments and (b) observational studies to study forest structure and dynamics. This contribution is an attempt to clarify fundamental differences, and to present examples, of these two approaches. We present recent developments regarding the installation of Designed Experiments and show that rigorous experimental design, usually found in planted forests and based on very specific manipulations, that are normally not found in the natural environment is required to address a particular hypothesis that cannot be tested by merely using available observations. We also present examples of new Forest Observational Networks established in China, India, Africa and America. These alternative research infrastructures are especially suitable for the study of natural forests that exhibit a high diversity of tree species with varying size and age structures. Our conclusion is that Forest Observational Studies are emerging as an important alternative to Designed Experiments because they provide a vast amount of information about complex natural forest communities rather quickly. However, long-term commitment is essential to ensure a steady flow of observations about forest dynamics. Manipulated experiments and observational studies can be complementary, but the optimum use of both installations requires careful planning and coordination.

Keywords

Experimental design Smithsonian Tropical Research Institute Longitudinal Cross-sectional Interval study 

Notes

Compliance with ethical standards

Conflict of interest

There is no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • K. von Gadow
    • 1
    • 2
    Email author
  • Xiu Hai Zhao
    • 4
  • V. P. Tewari
    • 3
  • Chun Yu Zhang
    • 4
  • Ashwani Kumar
    • 5
  • Jose Javier Corral Rivas
    • 6
  • Rajesh Kumar
    • 7
  1. 1.Burkhardt InstituteGoettingen UniversityGöttingenGermany
  2. 2.Department of Forestry and Wood ScienceUniversity of StellenboschStellenboschSouth Africa
  3. 3.Himalayan Forest Research InstituteShimlaIndia
  4. 4.Beijing Forestry UniversityBeijingChina
  5. 5.Indian Council of Forestry Research and EducationDehradunIndia
  6. 6.Institute for Silviculture and Wood IndustryDurango State UniversityDurangoMexico
  7. 7.Forest Survey of IndiaDehradunIndia

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