Non-native tree regeneration indicates regional and national risks from current invasions

Abstract

Non-native (introduced, exotic, and alien) species alter forest ecosystem processes, cause landscape change, interfere with services provided by native trees, and contribute to biotic homogenization. To quantify the degree of invasion by non-native trees in the United States, we combined two broad-scale datasets: (1) tree species occurrence data from the national Forest Inventory and Analysis (FIA) plot network and (2) ecoregions characterized by relatively homogeneous environmental conditions. Using the FIA statistical design, we created an indicator of non-native tree regeneration success by estimating the proportion of small trees (seedlings and saplings) relative to all trees for non-native species in the conterminous United States and southeast Alaska, Hawaii, and Puerto Rico. Species with at least 75 percent of their stems consisting of smaller stems were classified as highly invasive while those with 60 percent to 75 percent of smaller stems were classified as moderately invasive. Above these thresholds, non-native species are of ecological concern because they are established and reproducing successfully and therefore likely to continue to spread in the future. For the conterminous United States and southeast Alaska, we identified 16 highly invasive and four moderately invasive non-native tree species. Widespread highly invasive and relatively well-established species included Ailanthus altissima, Triadica sebifera, and Ulmus pumila. The richness of highly invasive species was the highest in parts of the Midwest and Mid-Atlantic States, followed by much of the Southeast. In Hawaii, we identified seven highly invasive and three moderately invasive non-native tree species. The most widespread highly invasive and well-established tree species in the archipelago were Psidium cattleyanum, Psidium guajava, Ardisia elliptica, and Syzygium cumini. The largest numbers of highly invasive species were inventoried in the lowland/leeward dry and mesic forests of O’ahu and the lowland wet and mesic forests of Hawai’i Island. Puerto Rico had 17 highly invasive and two moderately invasive tree species. The most widespread and well-established non-native species were Leucaena leucocephala, Spathodea campanulata, Coffea arabica, Syzygium jambos, and Melicoccus bijugatus. The results of this assessment offer insights into which species are most likely to alter forest ecosystems and which forests may be effectively managed to control invasive trees.

The distribution of Syzygium sp. and its potential use in green space of Universitas Sumatera Utara

“…Syzygium sp. is known for its various uses such as medicine, fruit plants, building green open spaces and others [4][5][6][7][8]. Research on the distribution and opportunities for utilization of this species has never been carried out in the green spaces of the USU campus.…”

Fostering sustainable practices in Zimbabwean tourism for firewood energy sustainability and efficiency amid costly renewables, weak policies, scarce electricity, and extensive deforestation

“…Invasive tree species are non‐native trees that spread aggressively in new environments (Potter et al, 2023). Though invasive trees can disrupt ecosystems, some species like eucalyptus provide abundant, rapidly renewable biomass that makes them appealing for firewood production (Potter et al, 2022). Prior researcher (Sze et al, 2022) defined deforestation as the permanent removal of trees to make land available for non‐forest uses like agriculture, infrastructure, and urban expansion.…”