![]() ![]() Pseud- otsuga menziesii (Douglas fir), a native conifer from Northwest America, is considered one of the most invasive forestry conifers in Europe. In order to prevent a further spread of alien species into peri-urban reserves, large scale anthropogenic disturbances should be minimized, already invaded sites must be monitored and buffer-zones protecting reserves from surrounding land use activities should be established.Īlien plants are subjected to different biotic and environmental barriers that limit their establishment success in the introduced range. Forests dominated by alien tree species within the reserve are not the source for alien species within natural forests, but they negatively affect native species richness by replacing adequate seed sources. Within forests alien plant species richness was, however, positively associated to the proximity to disturbed landscapes. Natural forest areas are less invaded until now. ![]() Aliens concentrate around disturbed ruderal and road sites, facilitating their spread into the reserve. Compared to other protected areas, alien species were frequently found in this reserve indicating the importance of urban areas as source for alien species. Within a peri-urban reserve close to the city of Concepción, south-central Chile, we investigated the influence of different site and landscape characteristics on the richness of native and alien plant species across different habitat (ruderal, road and forest sites) and forest types (native and alien dominated forests). ![]() However, little is known about the factors that determine invasibility and the role of roads and other human disturbances for such small protected areas. Particularly, intense propagule pressure by alien plant species can pose a threat to native biodiversity. This is the northern part of SDC between the two bridges crossing over Sonoma Creek.High human density and land use intensity often coincide with biodiversity hotspots making peri-urban reserves a keystone for conserving natural remnants in a highly anthropogenic matrix. We will be meeting in the parking lot of the old farmhouse/superintendent house on the SDC campus, located along Arnold Drive across from the parking area for Sonoma Valley Regional Park. Where: Western side of Arnold Drive in Sonoma Developmental Center (see directions below) What: Broom pull, an outdoor volunteer event All ages are welcome (children must be accompanied by an adult). Please wear sturdy shoes and clothes you don’t mind getting dirty in. Gloves and tools as well as drinks and snacks will be provided. That means now, and Mills said he is excited to spend the two days outside with fellow Sonoma Valley residents, working together to slow the spread of this pernicious plant. “I’ve been involved with its control for nearly 20 years now and have developed a systematic approach that has been effective.” Two important rules, he said, are don’t mow it, and try to pull it up while the ground is still wet. “Broom is a highly invasive species here on the Central Coast,” Mills said. These are family-friendly events where volunteers join us in a beautiful outdoor location – in Sonoma Developmental Center on sites where fire swept through in October 2017 – and help restore it to its natural glory. To slow its spread, Mills and the Restoration Department are inviting the public to take part in two outdoor “broom pull” events this month, on April 13 and April 22. But French broom is unwanted here because it’s environmentally destructive, a fire hazard, and very hard to control.Īnd according to Sonoma Ecology Center Restoration Program Manager Jason Mills, French broom ( Genista monspessulana) has been especially virulent this spring in Sonoma Valley’s post-fire areas. With the arrival of spring, the invasive shrub called French broom, with its long woody stalks and pretty yellow flowers, is popping up all over Sonoma Valley. ![]()
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