It’s Raining – But Only Under This Tree

I had an arresting experience when I went out into the woodland the other day. It has been extremely dry this winter in Oregon, but there is often a lot of fog. As I walked under one of the larger Douglas firs there was a sound of dripping rain on dried oak leaves and yet, it was not raining.

I’m not sure if I have ever experienced fog drip first hand in quite this way. I learned about it many years ago as a very significant (in the statistical meaning) source of ground water and soil moisture in the western Cascades.

Have I ever been in the woods when they are dripping? Yes, but standing under one single tree, that is collecting and dropping water is kind of eerie when everything else is quiet, the ground is dry, and it’s just very foggy. Being present as a tree essentially waters itself and channels the water into ground storage, reveals how trees = water = more trees and life.

So, come along with me and experience it for yourself. You might be able to see the raindrops falling in this cellphone movie:

Here, stand in the open where no rain is falling, and look back toward the mixed oak and the big Doug fir in the ravine. These trees were left behind when the forest was logged the first and/or second time in the last century. We left them too, when we thinned trees to revive the oak woodland. They protect a riparian zone of seasonal streamflow – the source of some of that flow is now apparent! That’s a Steller’s Jay imitating a Redtailed Hawk in the background.

So, why fog drip under conifers and not oaks (I asked myself)? I believe that the answer lies in leaf architecture. Moisture runs off the vast surface area of thousands of needles intercepting fog. Oaks are leafless in winter, but besides that, they support a huge biomass of lichens and mosses, which are designed to soak up nutrients and water from the air, as it’s their life support. Hence, lichens and mosses may tend to increase the humidity around a tree, but they sponge up rather than repel moisture like fir needles. Fir needles don’t need the moisture – they send it to the roots where they can use it.     Wow.

Link

Closeup on Forests of the Pacific Northwest : Image of the Day.

Had to share something I stumbled on while looking for a satellite image of the vast Eastern Oregon wetland that is the Malheur National Wildlife refuge. The accompanying text is very important. These carbon sinks are old growth conifer forests, not white oak woodlands, so a little departure from this blog’s theme.

Another feature not mentioned in the text is the very clearly defined “checkerboard lands”; a legacy of donation of the spoils of conquest to the railroad barons.

From Someone Who Loves The Rural Life

This short, wonderful message from the Times editorial writer Verlyn Klinkenborg floats off the page into the mind. His beautiful, simple style conveys, as it has many times in the past, meaning, imagery, feeling. And as he says, we all have our own farm in our mind’s eye. We make our own meaning daily. This reminded me of our Gopher Valley home, and also the place in my mind that has always been with me. I hope I can always see and share “something worth noticing and … (have) nearly always words to suit it” here in these pages too.

Farewell – NYTimes.com.

Looking back at some posts you may have missed

Beginning this week, I’ll post a few of my old favorites from months and years gone by.

It’s winter 2013 here on the edge of the Oregon Coast Range, the fog has rolled in after unseasonable cold weather, and now the skies are dripping – a good time to look at our beautiful lichens.

Mostly dormant during the long dry summer, any bit of moisture brings the neon greens of nitrogen-rich Lobaria pulmonaria (lungwort) popping out of the background, inviting us to look closer at all the clothing on the trees and logs, ground and rocks. Lobaria and Usnea lichens make a nice orange to orange-brown dye for wool which imparts a distinctive fragrance and, usually moth proof characteristics!

Here is my short look at some of the charismatic lichens of our woods, originally posted in December of 2010.

Lichens are so…likable!!

Although very important, they are under-appreciated. The spongy, moist, fungus-friendly winter is dark and depressing to us mammals, but it’s high season for lichens.

That grey-green color of the oaks in the GVJournal masthead?   Lichens!

Here’s are galleries with some fun facts.

Oak branch with a load of assorted lichens

  • Biodiversity.

Lichens are incredibly diverse and able to grow in extreme environments. Their chemistry is important to the ecosystems where they grow. For example, they are an important source of nitrogen in forests, and in arid lands, they conserve valuable topsoil. But to do their job, they need undisturbed substrates to grow on.

They also provide an environment for many organisms to exist – tiny arthropods and invertebrates that keep nutrients cycling in the ecosystem.

Why away from cities? Because lichens absorb all their nutrients and moisture directly from the air, they are sensitive to air pollution. This quality is so specific, scientists use them to map air quality and pollution levels. They can also concentrate some metals and radiation and be hazardous to consumer.

In cities pollution-tolerant lichens predominate, some less tolerant ones are distorted or rather small compared to lichens in fresh, clean air. Several of the lichens on the tree branch above, and the two below are very sensitive to pollution, and also need very moist air so they can function. The high humidity in the coastal NW promotes the growth of large showy lichens in clean air zones like mature and old-growth forests.

Lobaria pulmonaria – “lungwort”

Pseudocyphellaria anomala – “netted specklebelly”

  • Some people are under the impression that the “load” of lichens is damaging to trees and shrubs, but this is not the case.

They use plants as a place to grow but there is no evidence of damage. In fact the massive increase in surface area may be one reason why forests are able to extract and transfer appreciable amounts of moisture from “fog-drip” to watersheds even when it’s not actually raining.

  • The colorful common names of lichens indicate their longstanding interest to us. Many are important to a number of wildlife species, and to humans historically and in modern times.

Food, camouflage, dyes, and antibiotics are among the uses that other life forms have for lichens. The long strands of Old Man’s Beard and other Usnea species are collected to extract its chemicals which have antibiotic properties. It also protects animals that use it for nesting material.

Some medium long Usnea longissima

The alga is able to photosynthesize, producing carbohydrates which are then channeled to the fungal partner. Interestingly, if the algal partner is cultured separately, the carbs hardly “leak” at all. The fungus makes it possible for the alga(e) to live in places it normally would not survive. The fungi and algae each look completely different individually, and only take on their lichen form when together.

Although the association is termed symbiotic, it appears that it’s not an equal partnership. Lichenologists consider the fungus to be the controlling partner “farming” the alga or algae.

Even though we’ve used them for millenia, there’s always something new to learn about lichens. Scientists are studying some extra fungi present whose exact function is unclear.

This can happen very quickly. If you spray a dry lichen with water, it will  absorb moisture and change color immediately. This is a sign it is active.

In fact, lichens need alternate wetting and drying to cycle carbohydrates back and forth between the fungal and algal partners.

Dry Summer Lichens – bumpy leafy one is Lobaria pulmonaria

The same Lobaria species when it’s moist

-A Gallery of Gopher Valley Lichens click to view-

A Gallery of Gopher Valley Lichens

This slideshow requires JavaScript.

Thanks to lichenologist Katherine Glew (Univ of Washington) for teaching me about lichens. I can remember some of it.

Lichens of North America, by I.M. Brodo, S.D. Sharnoff & S. Sharnoff, and Macrolichens of the Pacific Northwest, by B. McCune and L. Geiser

Western Oak Looper – Beginning A New Generation

If you missed the news this late summer about the patches of oak devastation near Sheridan and other places in the Willamette Valley, here’s a hyper-local update (our property). When the damage is in full spate (i.e. the larvae are making oaks and doug firs look dead and blighted) it’s all about the caterpillars. Right now (mid November) I am seeing these moths everywhere flopping around on the ground. Their diaphanous, transparent wings seem hardly up to the task of finding a mate and laying eggs, particularly when they are rain-soaked. However, I’m sure we’ll be seeing their leaf-chewing offspring soon enough. By the way, there is a nice description of life cycles in that first link above. I highly recommend.

Perhaps these adults arrived from Dupee Valley or even as far as Red Prairie, where the oaks looked blasted last summer, carried on the wind of fall storms? They seem to be weak flyers so it’s hard to imagine them making the trip under their own steam.

It will be interesting to see whether our oaks get the same treatment next year, having escaped till now. See previous post for a good control method: our beloved brown creepers.

Western Oak Looper Used with permission:Jerald E. Dewey, USDA Forest Service, Bugwood.org Lambdina fiscellaria somniaria image #2252041

Western Oak Looper adult
Used with permission:Jerald E. Dewey, USDA Forest Service, Bugwood.org
Lambdina fiscellaria somniaria

The Rains Descend

Quote

hazelnuttruck_2

Fall means fresh hazelnuts and walnuts, still lots of produce from local farms

Suddenly, the fall rains are here. From our weather station record I see that:

  • Last Sept (2012) the total rainfall was 0.01″
  • So far this month 5.89″ have fallen out of the sky. The storm began on 9/20 and is still dumping rain – currently at a rate of 0.12″ per hour, but occasionally much heavier.
  • Another fact from the weather station archives: it was 96 degrees F. 3 weeks ago on Sept 10, 2013. Crikey!

The oaks will be slow to turn brown and drop their leaves, but acorns on the ground are cracking open with new sprouts already taking advantage of the wet.

Rather than waxing on about the weather and seasons, I defer to a very nice post by Verlyn Klinkenborg of the NY Tiimes, [this excerpt will take you to the main page - that's all the copyright I could afford]

The Silence of the Leaves

By VERLYN KLINKENBORG

…I’ve been thinking about the way autumn has stolen upon us. When the first leaves turn — a roadside maple in August — it’s easy to ignore the coming season. But now all the trees are turning in concert, rushing to a foregone conclusion. I’m struck by how silently it happens. The pastures have gone quiet at night. … more

Swallow update

Current news from the Yamhill Birders’ list. Wowwee.

Four birders and two local folks gathered at the BARN SWALLOW roost site on Grand Island Loop Rd. this evening. We saw few birds until sunset about 7:55. Then they gathered from all compass points and went down into the cornfield as advertised. I estimate about 80,000. The show lasted from about 8:00-8:20 PM.

Some (approx) migration schedules here http://www.learner.org/jnorth/tm/swallow/News.html