All things Green and Dirty v2.0

[KichigaiNeko]

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The Hidden World Under Our Feet

THE world’s worrisome decline in biodiversity is well known. Some experts say we are well on our way toward the sixth great extinction and that by 2100 half of all the world’s plant and animal species may disappear.

Yet one of the most important threats to biodiversity has received little attention — though it lies under our feet.

Scientists using new analytical techniques over the last decade have found that the world’s ocean of soil is one of our largest reservoirs of biodiversity. It contains almost one-third of all living organisms, according to the European Union’s Joint Research Center, but only about 1 percent of its micro-organisms have been identified, and the relationships among those myriad life-forms is poorly understood.

Soil is the foundation on which the house of terrestrial biodiversity is built. Without robust soil ecosystems, the world’s food web would be in trouble.

“There’s a teeming organization below ground, a factory, with soil animals and microbes, each with their own role,” said Diana H. Wall, a professor of biology at Colorado State University who has studied soil biodiversity in Antarctica and Kansas over the last two decades and who is the scientific chairwoman of the soil biodiversity initiative. “A leaf falls, and earthworms and termites are constantly ripping and tearing it apart, and microbes and fungi pass the nutrients on to plants.”

Forget the term “dumb as dirt.” The complex soil ecosystem is highly evolved and sophisticated. It processes organic waste into soil. It filters and cleans much of the water we drink and the air we breathe by retaining dust and pathogens. It plays a large role in how much carbon dioxide is in the atmosphere. Soil, with all of its organic matter, is second to the oceans as the largest carbon repository on the planet. Annual plowing, erosion and other mismanagement releases carbon in the form of carbon dioxide, and exacerbates climate change.

The last decade of research has overturned a key concept. For decades there was a saying among soil scientists — “everything is everywhere,” which meant that soil was largely the same across the globe. That has proved to be spectacularly untrue.

Read More: http://www.nytimes.com/2013/05/12/opinio...l&_r=1&

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http://youtu.be/dC_2WXyORGA