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For just as long as anyone can remember, standing dead trees in the forest have been recognized by ecologists and conservationists as key to maintaining biodiversity. These trees, also known as snags, create important habitats for a wide range of woodland creatures.
They’ve always been so important that conservation crews have gone as far as creating, rather than removing, them from forest areas. By converting a percentage of live trees into snags through several different methods, they hope to enhance and preserve these habitats for the future.
However, there were still a lot of unanswered questions about how well these methods actually work and which ones are most effective for promoting biodiversity.
Recent research by Jim Rivers of the Oregon State University College of Forestry has provided some valuable answers. He learned that chain-saw topping has been the best method for creating the most effective standing dead trees in the long term.
In a study published in the journal Forest Ecology and Management, Rivers explains that the creation of these snags is instrumental in providing and sustaining habitats for woodland species.
“One of the key findings from our research was that the different treatments used resulted in varying levels of decay after nearly two decades,” Rivers explains. “But, what we found was that mechanical wounding and fungal inoculation were less effective in creating these habitats. Adding fungal inoculation to topped trees looked good in theory, but in practice, it didn’t make much difference.”
Even in wilderness areas, snags remain crucial for providing homes and feeding grounds for forest-dwelling species. Woodpeckers, in particular, are of crucial importance among those species, acting as ecosystem engineers by contributing to the overall health of the forest habitat.
Despite their significance, standing dead trees in managed forests are often removed for their commercial value or other reasons. Oregon, for instance, currently has no requirements for preserving snags on state or private lands.
“This study showed that snags may serve a variety of purposes within forest ecosystems,” Rivers states. “More attention needs to be paid to preserve these trees within managed forests, particularly those of larger diameters.”
In his research, Rivers examined snags near Coos Bay in two large study sites totaling 7.5 square kilometers, about 4 kilometers apart from each other.
All of the treatments resulted in some type of decay,