NGHIÊN CỨU ĐẶC ĐIỂM HẠT GIỐNG VÀ KỸ THUẬT NHÂN GIỐNG HỮU TÍNH HOÀNG ĐÀN HỮU LIÊN (Cupressus tonkinensis Silba. J.)

Abstract

Cupressus tonkinensis Silba. J. (commonly known as Hoàng đàn hữu liên) is one of the ten priority conifer species for conservation in Vietnam. It is a narrowly endemic and rare species, classified as Critically Endangered (CR A1a, d) in the Vietnam Red Data Book (2007), and listed in Group IA (Category of endangered, precious, and rare forest plants and animals) under Government Decree No. 84/2021/NĐ-CP dated September 22, 2021. Seeds for this study were collected from scattered planted trees at three locations: Xuan Mai (Ha Noi), Phuc Yen (Vinh Phuc), and Huu Lien (Lang Son). The results showed that the seed purity of Cupressus tonkinensis ranged from 93.41 - 95.49%; the average weight of 1,000 seeds ranged from 6.89–7.06 g, corresponding to approximately 140,000 - 145,000 seeds per kilogram. The average germination rate was 43.3%, with an average germination time of 17.1 days and an average germination energy of 22.7%. Soaking seeds in warm water at 45°C for 8 hours resulted in the highest germination rate of 43.3%. When stored at 5-8°C, the germination rate was 34% after six months. The best seedling growth was obtained using a potting mixture of 90% forest topsoil + 10% organic fertilizer with 50% shading.