Following research published by The Woodland Trust, the national park authority plans to plant over 1000,000 trees throughout Sussex and Hampshire.
According to the research, one third of all woodland species in the UK are in decline, with one in ten species are at risk of extinction.
Due to be planted this winter to revive the disease hit woodlands it is estimated that the South Downs national park alone will have 23,000 new trees.
Nick Heasman, countryside, and policy manager for the park, says that “our tree-scape supports a wealth of wildlife. But with the unprecedented threats from pests, diseases, and climate change, increasing the number and diversity of our native trees would be a big help.”