The Unwild Wood
Posted by Richard Conniff on January 19, 2013
Honestly, this stuff drives me a little nutty. It’s a press release that manages to kill the magic of forests and of a favorite children’s book in a single headline “Wind in the willows boosts biofuel production: Trees grown diagonally produce five times more biofuel.”
So, ok, if you are like me, you read Kenneth Grahame’s Wind in the Willows as a child and loved it for Mr. Toad, Ratty, Mole, and all the other characters, as well as for the wondrous, somewhat frightening, tangle of the Wild Wood.
Now some idiots are using all that to rationalize the idea of tree plantations, with all the trees uniformly spaced and lined up in perfect rows. Probably with a regimen of herbicides to keep down the undergrowth. So the wind will flow through the willows (get it?) and make more biofuel.
It just makes me want to call out Weasel, Stoat, Ferret, and Fox to rip their silly scientific flesh, except that none of these animals would ever go anywhere near such a forest.
To be fair, the actual scientific article never mentions the Grahame book. So maybe it’s just another case of the damned press release writers screwing up the science. But the science still promotes tree plantations at the expense of real forests. And I just want some damned flesh here, preferably shredded.
I’ve posted a couple of articles lately on the perils of valuing nature only for the biofuel or other “ecosystems services” it provides. There was this one about how an ecosystem services scheme just ended up providing cash for hunting wolves, and my own take on how things can go wrong when we put a price on nature.
So in that context, take a look at the press release from ScienceDaily and weep with me:
Jan. 18, 2013 — Willow trees cultivated for ‘green energy’ can yield up to five times more biofuel if they grow diagonally, compared with those that are allowed to grow naturally up towards the sky.
This effect had been observed in the wild and in plantations around the UK, but scientists were previously unable to explain why some willows produced more biofuel than others.
Now British researchers have identified a genetic trait that causes this effect and is activated in some trees when they sense they are at an angle, such as where they are blown sideways in windy conditions.
The effect creates an excess of strengthening sugar molecules in the willows’ stems, which attempt to straighten the plant upwards. These high-energy sugars are fermented into biofuels when the trees are harvested in a process that currently needs to be more efficient before it can rival the production of fossil fuels.
Willow is cultivated widely across the UK, destined to become biofuels for motor vehicles, heating systems and industry. The researchers say that in the future all willow crops could be bred for this genetic trait, making them a more productive and greener energy source.
The study was led by Dr Nicholas Brereton and Dr Michael Ray, both from the Department of Life Sciences at Imperial College London, who worked with researchers at Rothamsted Research, and the University of the Highlands and Islands’ Agronomy Institute (at Orkney College UHI). The study is published in the journal Biotechnology for Biofuels.
Dr Brereton said: “We’ve known for some time that environmental stresses can cause trees to naturally develop a slightly modified ‘reaction wood’ and that it can be easier to release sugars from this wood. This is an important breakthrough, our study now shows that natural genetic variations are responsible for these differences and this could well be the key to unlocking the future for sustainable bioenergy from willow.”
The researchers conducted a trial in controlled laboratory conditions on a rooftop in central London at the Gro-dome facility at Imperial’s South Kensington Campus. They cultivated some willows at an angle of 45 degrees, and looked for any genetic differences between these plants and those allowed to grow naturally straight upwards.
The team then looked for the same effect with willows growing in natural conditions on Orkney Island, off the northern-most coast of Scotland, where winds are regularly so strong that the trees are constantly bent over at severe angles. Their measurements confirmed that the willows here could release five times more sugar than identical trees grown in more sheltered conditions at Rothamsted Research in the south of the UK.
Dr Angela Karp at Rothamsted Research who leads the BBSRC-funded BSBEC-BioMASS project said “We are very excited about these results because they show that some willows respond more to environmental stresses, such as strong winds, by changing the composition of their wood in ways that are useful to us. As breeders this is good news because it means we could improve willow by selecting these types from the huge diversity in our collections”.
This work forms part of the BBSRC Sustainable Bioenergy Centre (BSBEC) where it is linked with other programmes aimed at improving the conversion of biomass to fuels. Coupled with work at Rothamsted Research, where the National Willow Collection is held, the new results will help scientists to grow biofuel crops in climatically challenging conditions where the options for growing food crops are limited, therefore minimising conflicts of food versus fuel.
About Willow Trees
Traditionally grown for wicker furniture and baskets, and an ancient medicinal plant whose chemical contents were the precursors to Aspirin, willows are now seen as important crops for energy and the environment. Willow requires less than a tenth of the fertiliser used for most cereal crops, and its shoots re-grow quickly after they are harvested. Environmental groups also say that willow plantations are also attractive to a variety of wildlife, making a positive impact on local biodiversity.
Source: Nicholas JB Brereton, Michael J Ray, Ian Shield, Peter Martin, Angela Karp, Richard J Murphy. Reaction wood – a key cause of variation in cell wall recalcitrance in willow. Biotechnology for Biofuels, 2012; 5 (1): 83 DOI: 10.1186/1754-6834-5-83