Scientists have conducted the first worldwide study of biodiversity and its impact on the productivity of forests. Data from more than 770,000 observation points from 44 countries were evaluated for this purpose. The samples included in the study comprised 8,700 species of trees from mangroves to trees in tropical rainforests, Central Europe, tundras, and dry savannas to populations in Mediterranean forests. The authors conclude that a decline in the number of species leads to massive cuts in the productivity of forests, whereas monocultures converted into mixed stands can yield significantly higher levels of timber growth.
The highest levels of biodiversity in the world are found in forests, but deforestation, forest degradation, and climate change are having a serious impact on half of all tree species. Although the preservation of the tree stock and sustainable forest management have been the subject of much discussion and have been promoted through environmental measures across the globe, the general decline in species, along with its serious consequences, continues.
The study published in the current issue of “Science” illustrates how the global decline in biodiversity is accompanied by a decline in timber growth.
“On the one hand, the study sets new standards because of its geostatistical methodology and global scope. It included an immense volume of data on biodiversity and productivity from nearly 50 countries throughout the world, which has never been done before in this field of science," said co-author Professor Hans Pretzsch, the Director of the Chair of Forest Growth and Yield Science at the Technical University of Munich (TUM).
On the other hand, the research results also lend further weight to the Brundtland Report and the Helsinki and Montreal resolutions. "The conclusion of our study is that, for example, when the number of species declines by 10 percent the wood production decreases on average by six to seven percent. And the rate of decline increases exponentially with further reduction of species richness” said Pretzsch. His team contributed a comprehensive data set of inventories and long-term experimental plots of pure and mixed stands in Central Europe.
Experimental Data over a Period of More than 150 Years
“The inventories and experimental plot data from more than 150 years demonstrate how timber growth decreases in parallel with the number of species,” Professor Pretzsch explained, “and how it can increase toward mixed stands again with the conversion of forest monocultures.” Particularly in the 1950s and 60s, Germany heavily relied on forest monocultures with only one species, such as spruce or pine, “a policy that we have consciously backed away from in the recent years. Meanwhile, the silviculture guidelines of many countries stipulate that, whenever possible, stocks should be comprised of two or three species.”
The study published in Science, which took into account the major global forest ecosystems, clearly shows that in addition to the many ecological and social benefits, mixed stands can also provide a material benefit in terms of increased productivity.
Annual Loss Estimated at around 490 Billion US Dollars
The authors have hypothetically calculated what would happen if the species continued to decline throughout the world as they have in recent years: If mixed forests continue to be cleared and converted into monocultures such as eucalyptus or pine, then productivity will steadily decrease.
With a species impoverishment of 99 percent, the approximate loss in value would be of 166 to 490 billion US dollars per year. The authors of the study note that these high losses amount to the double times the annual global expenditure for the conservation of biodiversity. Other losses caused by the reduction in biodiversity include decreases in genetic diversity, protective functions, and recovery functions, which go far beyond the reduction in timber production.
The results of the study provide the Intergovernmental Platform on Biodiversity and Ecosystem Services (UN IPBES) and the United Nations Convention on Biological Diversity (UNCBD) with an important quantitative basis for the intelligent protection and sustainable management of forests.
Liang, J., Crowther, TW., Picard, N., Wiser, S., Zhou, M., Alberti, G., Schulze, E.-D., McGuire, A.D., Bozzato, F., Pretzsch, H., de-Miguel, S., Paquette, A., Hérault, B., Scherer-Lorenzen, M., Barrett, C.B., Glick, H.B., Hengeveld, G.M., Nabuurs, G.J., Pfautsch, S., Viana, H., Vibrans, A.C., Ammer, C., Schall, P., Verbyla, D., Tchebakova, N., Fischer, M., Watson, J.V., Chen, H.Y.H., Lei, X., Schelhaas, M.-J., Lu, H., Gianelle, D., Parfenova, EI., Salas, C., Lee, E., Lee, B., Kim, HS, Bruelheide, H, Coomes, DA, Piotto, D, Sunderland, T, Schmid, B, Gourlet-Fleury, S, Sonké, B, Tavani, R., Zhu, J., Brandl, S., Vayreda, J., Kitahara, F., Searle, E.B., Neldner, V.J., Ngugi, M.R., Baraloto, B., Frizzera, L., Bałazy, R., Oleksyn, J., Zawiła-Niedźwiecki, T, Bouriaud, O, Bussotti, F, Finér, L, Jaroszewicz, B, Jucker, T, Valladares, V, Jagodzinski, A.M., Peri, P.L., Gonmadje, C., Marthy, W., O'Brien, T., Martin, E.H., Marshall, AR, Rovero, F, Bitariho, R, Niklaus, PA, Alvarez-Loayza, P, Chamuya, N, Valencia, R, Mortier, F, Wortel, V., Engone-Obiang, N.L., Ferreira, L.V., Odeke, D.E., Vasquez, R.M., Lewis, S.L. and Reich, P.B.: Positive Biodiversity–Productivity Relationship Predominant in Global Forests, Science 2016. DOI: 10.1126/science.aaf8957
Photos in High-Resolution: https://mediatum.ub.tum.de/1328858?id=1328858
Prof. Dr. Dr. h.c. Hans Pretzsch
Technical University of Munich
Chair of Forest Growth and Yield Science
Hans-Carl-von-Carlowitz Platz 2
Tel: +49 (8161) 71-4710
Forest Scholars Worldwide Team Up For Biodiversity Research
The research, published on October 14th, 2016 in the journal Science, marks the first major accomplishment of the team, formally known as the Global Forest Biodiversity Initiative (GFBI). Established in 2016, GFBI is an international, interdisciplinary, and multi-stakeholder research collaborative that aims at better understanding broad-scale patterns and processes associated with the planet's four billion hectares of forested ecosystems. For details, visit http://www.GFBinitiative.org/.
Dr. Ulrich Marsch | Technische Universität München
Cereals use chemical defenses in a multifunctional manner against different herbivores
06.12.2018 | Max-Planck-Institut für chemische Ökologie
Can rice filter water from ag fields?
05.12.2018 | American Society of Agronomy
The scientific and political community alike stress the importance of German Antarctic research
Joint Press Release from the BMBF and AWI
The Antarctic is a frigid continent south of the Antarctic Circle, where researchers are the only inhabitants. Despite the hostile conditions, here the Alfred...
World first experiments on sensor that may revolutionise everything from medical devices to unmanned vehicles
The new sensor - capable of detecting vibrations of living cells - may revolutionise everything from medical devices to unmanned vehicles.
Dead and alive at the same time? Researchers at the Max Planck Institute of Quantum Optics have implemented Erwin Schrödinger’s paradoxical gedanken experiment employing an entangled atom-light state.
In 1935 Erwin Schrödinger formulated a thought experiment designed to capture the paradoxical nature of quantum physics. The crucial element of this gedanken...
Cellulose obtained from wood has amazing material properties. Empa researchers are now equipping the biodegradable material with additional functionalities to produce implants for cartilage diseases using 3D printing.
It all starts with an ear. Empa researcher Michael Hausmann removes the object shaped like a human ear from the 3D printer and explains:
The phenomenon of so-called superlubricity is known, but so far the explanation at the atomic level has been missing: for example, how does extremely low friction occur in bearings? Researchers from the Fraunhofer Institutes IWM and IWS jointly deciphered a universal mechanism of superlubricity for certain diamond-like carbon layers in combination with organic lubricants. Based on this knowledge, it is now possible to formulate design rules for supra lubricating layer-lubricant combinations. The results are presented in an article in Nature Communications, volume 10.
One of the most important prerequisites for sustainable and environmentally friendly mobility is minimizing friction. Research and industry have been dedicated...
16.01.2019 | Event News
14.01.2019 | Event News
12.12.2018 | Event News
18.01.2019 | Materials Sciences
18.01.2019 | Life Sciences
18.01.2019 | Health and Medicine