Atlas Redwood in Atlas Grove
This page is an off-shoot of Largest Coast Redwoods
Copyright 2009 by Mario Vaden
Atlas Tree is a coast redwood within Atlas Grove of Prairie Creek Redwoods State Park. The photo below, is part of the trunk with an unusually shaped stem or branch remnant. In the image to the right, I'm holding my hand on a tape about 4.5 feet above grade, the height at which a tape would be wrapped around the trunk to measure the circumference and diameter. Referred to as diameter dbh.
Its in the midst of what was a study plot called Atlas Project: 1 hectare. The grove is larger. Other tree species include Douglas fir, western hemlock, California bay, cascara, and big leaf maple. The understory is dominated by western sword fern, California huckleberry, red huckleberry, redwood sorrel and a bit of salmonberry. The main trunk was previously broken between 55 and 60 m giving growth to five large reiterations plus 20 minor reiterations. Atlas redwood held 65 epiphyte mats with approximately 677 kg dry mass of leather-leaf fern. Other epiphytes present within the crown include California huckleberry, cascara, trailing black currant, lady fern and an assortment of lichens.
Epiphyte mats in Atlas Tree, during the study, appeared to exert a large effect on air temperatures in their immediate vicinity. Compared to the treetop, air temperatures around the mats were cooler, exhibited less variability, and had higher minimum and lower maximum temps. Relative humidity around soil mats was higher and less variable than the treetop. The size and position of mats within the crown affected humidity patterns. Those which were larger and deep in the crown had higher average and more stable humidity.
Remnants of a broken limb or reiteration on the lower trunk is shown in the photo. It reminds me of a wooden triceratops . Dr. Robert Van Pelt made a black and white drawing of this redwood. On his drawing, that growth shows a small trunk or stem rising upward. It has since broken off.
For reference, 2009 data for Atlas redwood is 288' or 87.8 m high, 20,0' diameter, and 26,938 cubic feet wood volume. It was the 19th largest known coast redwood. Even though this redwood is undisclosed, many others in the park are equally impressive for viewing. This park is North of Fortuna, Eureka, Arcata and Trinidad, and south of Crecent City, California.
