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Background

In recent studies, mixed forests were found to be more productive than monocultures with everything else remaining the same.

Methods

To find out if this productivity is caused by tree species richness, by a more heterogeneous stand structure or both, we analyzed the effects of forest structure and tree species richness on stand productivity, based on inventory data of temperate forests in the United States of America and Germany.

Results

Having accounted for effects such as tree size and stand density, we found that: (Ⅰ) tree species richness increased stand productivity in both countries while the effect of tree size heterogeneity on productivity was negative in Germany but positive in the USA; (Ⅱ) productivity was highest at sites with an intermediate amount of precipitation; and (Ⅲ) growth limitations due water scarcity or low temperature may enhance structural heterogeneity.

Conclusions

In the context of forest ecosystem goods and services, as well as future sustainable forest resource management, the associated implications would be:

● Tree species richness is vital for maintaining forest productivity.

● As an optimum amount of precipitation is accompanied by the highest productivity, changes in climatic conditions should be considered when planning.

● Resource limitations enhance structural heterogeneity, which in turn can have positive or negative effects on stand productivity.

Furthermore, we discuss the difficulties encountered when analyzing different national forest inventories and large data sets.


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Tree species richness enhances stand productivity while stand structure can have opposite effects, based on forest inventory data from Germany and the United States of America

Show Author's information Laura Zeller1 ( )Jingjing Liang2Hans Pretzsch1
Center of Life and Food Sciences Weihenstephan, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany
Division of Forestry and Natural Resources, Davis College of Agriculture, Natural Resources & Design, West Virginia University, 340 Percival Hall, Morgantown, WV 26506-6108, USA

Abstract

Background

In recent studies, mixed forests were found to be more productive than monocultures with everything else remaining the same.

Methods

To find out if this productivity is caused by tree species richness, by a more heterogeneous stand structure or both, we analyzed the effects of forest structure and tree species richness on stand productivity, based on inventory data of temperate forests in the United States of America and Germany.

Results

Having accounted for effects such as tree size and stand density, we found that: (Ⅰ) tree species richness increased stand productivity in both countries while the effect of tree size heterogeneity on productivity was negative in Germany but positive in the USA; (Ⅱ) productivity was highest at sites with an intermediate amount of precipitation; and (Ⅲ) growth limitations due water scarcity or low temperature may enhance structural heterogeneity.

Conclusions

In the context of forest ecosystem goods and services, as well as future sustainable forest resource management, the associated implications would be:

● Tree species richness is vital for maintaining forest productivity.

● As an optimum amount of precipitation is accompanied by the highest productivity, changes in climatic conditions should be considered when planning.

● Resource limitations enhance structural heterogeneity, which in turn can have positive or negative effects on stand productivity.

Furthermore, we discuss the difficulties encountered when analyzing different national forest inventories and large data sets.

Keywords: Big data, Climate, Overyielding, Tree size heterogeneity, Tree species mixing, BiodiversityɃproductivity relationship

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Publication history

Received: 21 July 2017
Accepted: 20 December 2017
Published: 11 February 2018
Issue date: March 2018

Copyright

© The Author(s) 2018.

Acknowledgements

Acknowledgements

This study has been supported in parts by the BiodivERsA project, "GreenFutureForests" (#01LC1610B), the FORD project Biotip (#01LC1716D) promoted by the German Aerospace Center (DLR) and the Federal Ministry of Education and Research, the project Sumforest - REFORM Risk Resilient Forest Management (#2816ERA02S), and by the West Virginia University, and the USDA McIntire-Stennis Funds WVA00126. We thank the Global Forest Biodiversity Initiative for establishing the data standards and collaborative framework. The first and third authors also thank the Bavarian State Ministry of Nutrition, Agriculture, and Forestry for permanent support of the project W 07 "Long-term experimental plots for forest growth and yield research" (#7831-22209-2013).

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