When we think of forest ecosystems, we usually picture dense thickets of trees, the vibrant buzz of insects and birds, and lush undergrowth carpeting the floor. We often fail to recognize the complexity hidden beneath the surface—a vast and ancient network of fungi, called mycorrhizae interwoven with every plant root. These 450 million year-old symbiotic… Read more »
I paused at the top of Coweeta Hydrologic Lab’s transect #327, peering down, down, down at the slope beneath me. Katie Bower, a research technician at Coweeta, and two summer interns had already started down the narrow pathway, accustomed to its slippery leaf layer and sharp contours.
Landscape ecologists and nature-lovers are well aware of the way that valleys collect deeper, moister soils than neighboring hill slopes and crests. Now, researchers at Coweeta LTER have have found that cool air, sliding downslope from higher elevations and pooling in mountain valleys, subsidizes productivity in a different way. The cold air drainage was most prevalent at night and in the evenings, so it had little effect on photosynthesis, but reduced plant and soil respiration by about 8 percent. Overall, the authors estimate it boosted annual net carbon uptake by about 15 percent.
