A biological island in time
The Shennongjia Forestry District is a geological and biological anomaly. Its complex topography, with peaks rising over 3,000 meters and deep, sheltered valleys, created a mosaic of microclimates. This landscape acted as a massive natural refuge during the Quaternary glaciations. While ice sheets advanced and retreated across much of the Northern Hemisphere, wiping out entire ecosystems, many species in Shennongjia simply migrated up or down the slopes to find suitable conditions. As a result, the region preserves a continuous lineage of subtropical and temperate forests that have evolved in relative isolation for millions of years.
This area protects the largest primary forests remaining in Central China. The altitudinal range of nearly 2,700 meters creates distinct vertical vegetation zones, from subtropical forests at the base to alpine meadows at the peaks. The district contains an exceptional number of plant species, including 3,767 vascular plants, with 205 species and two genera endemic to the property itself. This botanical diversity has been a focus of scientific expeditions since the 19th century; between 1884 and 1889 alone, international collectors recorded over 500 new species from the area.
Living fossils of the forest
Shennongjia contains species called "living fossils"—organisms that have survived from ancient geological periods. One of the most famous is the dove tree, Davidia involucrata. Best known for its large, white bracts that flutter like doves in the wind, it is the only living species in its genus, with a fossil record extending back to the Upper Cretaceous.
Another relict species is the dawn redwood, Metasequoia glyptostroboides. This deciduous conifer was first identified from Pliocene-era fossils in 1941 and believed to be extinct for over 5 million years. In 1943, a Chinese forester discovered a small, living population near a village in Hubei. Seeds collected in 1947 by an expedition from Harvard's Arnold Arboretum were distributed to botanical gardens worldwide, saving the species from potential extinction.
The forests also are a habitat for the Hubei golden snub-nosed monkey (Rhinopithecus roxellana hubeiensis), the most endangered of the three subspecies in China. This primate is adapted to temperate mountain forests and can withstand colder temperatures than any other non-human primate. The population in Shennongjia has increased from around 500 individuals in the 1980s to a recent count of 1,618. Other rare animals include the clouded leopard, Asiatic black bear, and the Chinese giant salamander, the world's largest amphibian.