Organic agriculture boosts biodiversity on farmlands

Does organic farming foster biodiversity? The answer is yes, however, the number of habitats on the land plays an important role alongside the type and intensity of farming practices. These are the findings of an international study that looked at ten regions in Europe and two in Africa. The results has been published in Nature Communications. The study shows that even organic farms have to actively support biodiversity by, for example, conserving different habitats on their holdings.

An international team, including scientists from Technische Universität München (TUM), investigated the contribution of organic farming to supporting farmland biodiversity between 2010 and 2013. Researchers wanted to explore whether organic farms are home to more species than their conventional neighbors. The team used uniform methods across Europe to capture data and analyze it to establish the impact of farming methods and intensity and of landscape features on biodiversity.

"Organic farming is beneficial to the richness of plant and bee species. However, observed benefits concentrate on arable fields," says TUM's Prof. Kurt-Jürgen Hülsbergen. His Chair for Organic Agriculture and Agronomy analyzed 16 Bavarian dairy farms.

The study investigated farms in twelve regions with different production systems. In each region, farms were selected randomly, half of them certified organic for at least five years. In Switzerland, grassland-based cattle farms were studied and in Austria the study looked at arable farms. In Italy and Spain, researchers focused on farms with permanent crops such as wine and olives, and on small-scale subsistence farms in Uganda.

More species because of field boundaries

More species were found in organic arable fields than in non-organic fields. In contrast, there was little difference in grasslands or vineyards. Organic farming benefited the four taxonomic groups of plants, earthworms, spiders and bees -- which were sampled as surrogates for the multitude of creatures living on farmland -- in different ways. In general, more species of plants and bees were found on organic than on non-organic fields, but not more species of spiders and earthworms.

If types of field boundaries such as grass verges or hedges were included in the comparison, the difference between organic and non-organic decreases. "Obviously, most species found in fields on organic farms tend to be concentrated in boundary areas on non-organic farms. There was little difference in the total number of species on the farms," explains Max Kainz, who headed the sub-project at TUM. The occurrence of rare or threatened species did not increase on organic farms, according to Kainz.

Even organic farms need to increase habitats

To sustain farmland biodiversity, which is currently under grave threat, researchers have identified complement organic farming methods with dedicated efforts to conserve habitats. To increase the number of habitats, the authors of the study recommend adding structural elements, such as woods, grass verges and fallow land, to farms. "Surprisingly, viewed across all regions, we did not find a higher number of natural habitats on organic farms than non-organic farms," reports Kainz.

"However, it was clear that habitat diversity is the key to species diversity," adds Prof. Hülsbergen. He continues: "The results of the study underline the importance of maintaining and expanding natural landscape features -- something that the EU's Greening Program has been trying to accomplish." If these additional habitats are different to the rest of the farm, for example hedges in grassland farms or herbaceous strips in arable farms, they have a huge impact on the biodiversity of a farm.

Source: Sciencedaily.com

The Clean Industrial Revolution

The problem with cutting greenhouse gas emissions is that it will harm economic growth. Right? No, quite the opposite, says Ben McNeil in his book The Clean Industrial Revolution. It’s an age-old myth that doing good for the environment is bad for the economy. He’s addressing Australians, but what he has to say will arrest readers from many countries.

McNeil is a senior research fellow at the Climate Change Research Centre at the University of New South Wales. Besides a PhD in climate science he also holds a Master of Economics degree. The two worlds are bridged in this energetic book. Australia is very vulnerable to climate change through sea-level rise, rainfall changes, storms, and a decrease in food production. It is also highly carbon-intensive in its economy and its export industries will suffer as a consequence when the world starts to move heavily to reduce carbon emissions and impose carbon tariffs.

Such consequences can be pre-empted by a clean-energy revolution, one for which Australia is well-endowed. That hot arid interior is the potential source of vast quantities of high capacity solar power. The use of mirrors to concentrate sunlight so perfectly that the ultra-high temperatures convert water to steam is one way. Another, already under construction in north-west Victoria, uses mirrors to concentrate the sunlight on to high-performance photovoltaic panels. Solar power could replace the need for coal-fired power stations.

A massive underground “hot rock” heat source can be tapped to create steam for power generation, a technique already being worked on by a number of companies at several sites throughout Australia. Wind power in the south could supply 20 percent of the country’s needs. Advanced biofuels that do not impact on food can be produced. Biomass-fuelled electricity is already produced in some parts of rural Australia. Carbon capture and storage may hold some hope for the continuing use of coal, though not while coal companies put a miserly 0.3 percent of their production value into research, apparently believing that governments will do the work for them.

McNeil argues that Australia must take up a forefront position in the low-carbon economic future if it wants to remain prosperous. At the time of writing in 2009 he expected the emissions trading scheme to kick in, putting a price on carbon and pointing the economy towards investment in clean energy. This has been delayed, but even without it there is ample reason for the change of focus away from the carbon-intensive economy (carbon obesity he calls it). The world will soon be crying out for clean energy technology. Australia will continue to prosper in the future if it has used research and development to drive down the cost of renewable energy technologies, and investment to commercialise them and prepare them for export.

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