In the future, it looks like there will be a lot of fire in California. Whether that is Good Fire or Bad Fire depends on you…depends on each and every one of us. Although it might not be ‘natural,’ we need Good Fire because we messed up a long time ago by driving ungulates extinct. Can we rewind? Let’s see.
Infernal Invitation
Our part of Planet Earth is constantly producing tons of fuel for the next wildfire. The coastal prairies are the most productive grasslands in California, creating 4 tons of dry grass per acre every year. Oaks, madrones, redwoods, and Douglas fir grow fast and tall around here. Shrubby plant communities go from nothing to impenetrable, dense thickets in just six years, ready to carry another inferno shortly thereafter.
With plenty of plant biomass to burn, and because of climate change, it is only a matter of time and the right fire weather to set things ablaze across our landscape. Local tribes could get fires to carry through the forests every 4-6 years: that’s how quickly fuel builds up to carry flames. About 6 years after the last fire, we should start expecting the next one, especially if there’s the right conditions. 2 consecutive years of drought makes parts of plants die, creating the dry wildfire kindling. Next up…heat waves….and then wind….and then all that is needed is ignition. We expect more summer lightning to do the job of starting fires as climate change destabilizes weather patterns and sends parts of hurricanes spinning across California.
Compost Happens
People are wrong if they imagine that once plant leaves and stems fall, they quickly decompose into the soil. Lots of folks I talk to think that things rot…mushrooms break down plant parts, after all, right? The cycle of life is all about death, decay, and rebirth! In miniature experiments, many people work this cycle with compost piles, or at least they purchase compost and add it to their gardens. Compost is nature’s proof that decay happens, so it must be the same in the plant communities around here, right?
Mediterranean Mummies
Rot misconceptions are founded in moisture preconceptions. Half of the year, the hot part, is dry: no rain. The wet part of the year is cool. The combination slows decay. In the forests, from what I’ve seen no stem, branch, or trunk larger than 2”diameter will fully decay before it burns in the next fire. Rot resistant redwood needles accumulate in a thick mulch that carries smoldering fire. Grass stems in our prairies last 3-5 years if they don’t touch the ground or are grazed, so there’s lots of accumulation there, too. In shrubby areas, plants are so closely packed that nothing tips over onto the ground, so dead stems and whole dead bushes are held upright for years awaiting the next blaze.
Drier, Hotter, and Few Big Creatures
It hasn’t been this fire dangerous for very long in these parts. This coast was moister and cooler just 15,000 years ago. Pollen records show the departure of grand fir and the arrival of coast redwood around that time on the Santa Cruz coast. On the larger scale, California has been getting drier and hotter since the Rocky Mountains and the Sierra Nevada started blocking summer rain that came from that away. About 15,000 years ago, huge herds of animals went extinct here: elephant relatives, horse and camel relatives, bison, and many more grazing critters roamed in massive herds, grazing and browsing the landscape. This would have profoundly affected fuel accumulation and plant community structure. In that kind of situation, wildfire would have been much more patchily intense. Big grazing creatures crush brush, eat leaves, topple trees. Bears and ground sloths tear apart tree trunks. Dead plant parts plus big creature impacts plus moisture conditions would have made composting much more natural.
What Now?
Okay, so change is happening: what do we do now? Good Fire is the answer, and to make that happen will take everyone’s cooperation. Good Fire involves careful planning and enough labor to set ablaze large areas of nature…at the right time…at the right intensity…at the right season and interval. We will have to feel safe when people tend fires in our forests and grasslands, right up next to roads and homes. Not many people feel that sense of safety right now, but we are still learning and training, and getting better at working together and building trust.
Meanwhile
Meanwhile, how do we live around such a flammable and dangerous landscape? I see people clearing vegetation and trying all sorts of ways of disposing of dead plant parts. As fewer people burn wood for heat or cooking, that is decreasingly a means of wood disposal. People seem enamored with wood chip additions to landscaping, but wood chips only slowly decay and are a fire hazard for years. Some folks are ardent about hügelkultur and composting, but these systems are of limited potential, requiring intensive management and, often, summer irrigation to speed decay. I see many people attempting clearing and biomass addition – mulching, composting, and even summer irrigation – in our poor-soiled chaparral communities. These practices destroy epicenters of biodiversity, type converting precious habitat to flammable weeds and increasing the potential for pathogens to spread into the adjoining habitat. Better to carefully thin and prune back chaparral vegetation where necessary and have low-intensity wintertime burn piles.
In many other situations, wintertime burn piles seem a fitting solution while we await better alternatives, such as Good Fire. Burning piled up biomass takes skill and careful planning to do it right. There are good regulations which get you started on the right path to pile burning: they require not too big of pile and that the biomass is dry so as to create not too much smoke. Permissible burn days assure smoke doesn’t too badly affect human health. I suggest a few other items to the list of things to pay attention to when pile burning. First, don’t burn a pile where it sits: a fox skeleton was the first sign that taught me that. Poor fox, cowering in the pile of brush hoping we’d go away only to be set on fire! There are lots of other critters living under that pile of dead plants! Also, why not use that burn pile to do something else useful? For instance, use the heat to kill an unwanted tree, shrub, or weed. French broom seedbanks might be devastated by a burn pile. A jubata grass plant could be eradicated. A coyote bush that would otherwise start to invade a meadow could be taken out. Also, one might have a group around the bonfire for a social occasion. And, think about how the nutrients and burned bare patch might affect the natural situation: weeds (or natives) will grow stronger, fire-following plants might germinate along the perimeter!
Here’s to learning how to live in a new era on this wonderful landscape. Join a bonfire this winter and pitch some biomass onto the flames to make our community safer!
-this post originally published by Bruce Bratton in his laudable weekly blog at BrattonOnline.com