The fern Dicranopteris dichotoma is an important pioneer species of the understory in Masson pine (Pinus massoniana) forests growing on acidic soils in the subtropical and tropical China. To improve our understanding of the role of D. dichotoma in nitrogen (N) uptake of these forests. a short-term (15)N experiment was conducted at mountain ridge (MR. https://halohealthcarers.shop/product-category/arm-sleeves/