Resources

A source or supply from which benefit is produced, typically of limited availability. In biology it means, substances or objects required by a biological organism for normal maintenance, growth, and reproduction. wiki

Biodiversity and the resistance of forest ecosystems to drought

The extreme events induced by climate change will have drastic consequences on forest functions and services and may bring about important drought-induced die-off events. It is known, however, that biodiversity can promote forest ecosystem performance and resistance to insect pests and diseases. Promoting higher tree species richness in temperate forests is also suggested to be an appropriate management practice to be considered in the context of increased drought frequency and intensity in the future. Indeed, interactions among species may lead to positive complementarity effects of...

Photosynthetic responses of different tree species mixtures

Biodiversity regulates several aspects of ecosystem functioning and the delivery of ecosystem services. Many forest ecosystem services, such as timber production and carbon sequestration, are directly related to tree growth and photosynthesis rates. ...

Uncovering the mechanisms behind positive diversity-productivity relationships in forests.

Globally, forests play a critical role in mitigating climate change by removing CO2 from the atmosphere and storing it in wood. The strength of this carbon sync depends on a number of factors, such as climate, availability of nutrients and disturbance. On top of this, it is becoming increasingly apparent that diverse forests tend to be more productive than monocultures. But why? What are the mechanisms that enable diverse forest to outperform ones which are species poor? This is what we aim to understand.  ...

Functional diversity and functional identity determine carbon storage and tree productivity in Spanish forests

Biodiversity loss could reduce primary productivity and carbon storage provided by forests. Thus, biodiversity-ecosystem functioning relationships (BEF) are an important topic in ecology and have been broadly studied during the last decades. However, the underpinning mechanisms of biodiversity effects on multiple forest functions are not completely understood. Two non-exclusive mechanisms of the effects of diversity have been proposed: the complementarity effect (i.e. functionally diverse forests could enhance resource use efficiency and nutrient retention through niche partitioning and...

Tree species diversity mitigates disturbance impacts on the forest carbon cycle

Biodiversity fosters the functioning and stability of forest ecosystems and, consequently, the provision of crucial ecosystem services that support human well-being and quality of life. In particular, it has been suggested that tree species diversity buffers ecosystems against the impacts of disturbances, a relationship known as the “insurance hypothesis”. Natural disturbances have increased across Europe in recent decades and climate change is expected to amplify the frequency and severity of disturbance events. ...

Impacts of species diversity on root systems

Trees need root systems for anchorage and for water and nutrient uptake. Root systems consist of stumps, coarse roots and fine roots.  Coarse roots have diameter larger than 2 mm, and fine roots less than 2 mm. Stumps and coarse roots are needed for anchorage and transportation of water and nutrients and their lifespan is long. Fine roots are short living and they take up water and nutrients from soil. In most forests there are in addition to trees also other plants growing in understory. Their roots are mostly fine, less than 2 mm in diameter. The tops of trees can reach the height of...

Effects of biodiversity on the transmission of foliar fungal pathogens in the German tree diversity experiment BIOTREE

Current theory on transmission rates of plant pathogens predicts a strong influence of host diversity on the degree of infection. We tested this prediction for foliar fungal pathogens on forest tree species, making use of the BIOTREE tree diversity experiment in Germany. We hypothesized that fungal species diversity was positively and fungal pathogen load negatively related to tree species diversity. We conducted analyses at three hierarchical levels, at the plot level, the level of single tree species, and the level of individual fungus species. We found strong tree species identity...
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