Balance of nature: importance of ecosystems underground (Introduction)

by David Turell , Tuesday, August 27, 2019, 19:08 (1701 days ago) @ David Turell

There is a complex of microbes, fungi and plant roots interacting through nutrients exchanges that is in the infancy of its scientific delineation:

https://www.quantamagazine.org/soils-microbial-market-shows-the-ruthless-side-of-forest...

"Beneath the green vegetable world we see is a dark microbial world we don’t. The crops we eat, the forests that sustain us and most other life forms, even the regulation of Earth’s climate — all benefit from a shadowy network of fungi and bacteria that mobilize soil nutrients and trade them with plants for sugars and fats. And yet the workings of this subterranean society are almost unknown to scientists. For example, researchers just mapped for the first time the global distribution of three major groups of these microbes. Even in 2019, what lies beneath our feet remains a true scientific frontier.

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"Through innovative and groundbreaking studies, Kiers and her collaborators have gathered evidence that plants and their fungal conspirators are not just cooperating with each other but also engaging in a raucous and often cutthroat marketplace ruled by supply and demand, where everyone is out to get the best deal for themselves and their kind.

"Key to this picture is the revelation that the unseen underground world is just as complex, sophisticated and purposeful as the visible aboveground world we inhabit. Microbes are not simple, passive accessories to plants, but dynamic, powerful actors in their own right. Fungi can hoard nutrients, they can reward plants that are generous with their carbon reserves and punish ones that are stingy, and they can deftly move and trade resources to get the best “deal” for themselves in exchange.

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"... tantalizing research hints at a capability that has been suspected but never proved: that fungi might not be just nutrient traders but also sophisticated information processors.
Kiers is the first to admit that scientists have far to go in puzzling out the hidden rules of the tiny networked organisms that somehow support all the rest of us. “Doesn’t it strike you as odd?” she said. “We know so much about other types of networks. This is undoubtedly the most important network for our ecosystems, but we just don’t know anything about it. … It’s radically under-studied.”

"When plants crept onto land some 500 million years ago, microbes were waiting. Fungi and bacteria struck up relationships with their new neighbors. Plants, after all, could do something most microbes could not: harness solar energy to split apart atmospheric carbon dioxide and construct energy-rich sugars and fats from the pieces. The microbes, in turn, had mastered the art of freeing up the nutrients that plants needed from the soil — phosphorus especially, but also nitrogen; there is evidence that microbes help plants gain access to water as well. Some 80 percent or more of today’s land plants form partnerships with fungi; still other plants partner with bacteria. If the soil were somehow purged of its microbes, the plant and animal worlds would take a big hit.

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"Simard referred to forests as “supercooperators” and made the bold assertion that trees don’t just cooperate but communicate. She described birches and Douglas firs as engaging in a “lively two-way conversation” mediated by their underground collaborators. “I had found solid evidence of this massive belowground communications network,” she said, adding later in the talk, “Through back and forth conversations, they increase the resilience of the whole community.”

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"But what really distinguishes the fungal world is its diversity and complexity. A spoonful of soil contains more microbial individuals than there are humans on Earth. “It’s the most species-dense habitat we have,” said Edith Hammer, a soil ecologist at Lund University in Sweden. A single plant might be swapping molecules with dozens of fungi — each of which might in turn be canoodling with an equal number of plants.

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"Hammer reported evidence from experiments that fungi have a second trick: They can store nutrients when a plant isn’t paying well, withholding them until they get a better offer.
Together, the results turned scientists’ understanding of the plant-fungal relationship on its head. No longer could mycorrhizal fungi be seen as servants or passive accessories to their plant masters. Rather, life forms below the surface control their own fate, just as much as those above. It’s a dynamic marriage of equals."

Comment: Huge article barely touched upon. Key point: the entire Earth's life systems consist of these interlocking relationships at macroscopic or microscopic levels. Balances of nature are essential to the maintenance of living organisms. Individual systems may come and go over time as dhw notes, but at any given moment there must be necessary systems operating to support the life forms depending upon them.