优树是建立林木种子园的物质基础,是育种的原始材料。优树选择是从条件相似、林龄相同(或相近)的同种天然林或人工林分中,把那些生长突出、产量超众、品质优异、抗性强的个体选择出来,并从中选的单株上分别采集种子和穗条,进行繁殖,通过鉴定比较,评选出遗传品质优良的单株,建立采穗圃或种子园,作为良种繁育的基地。我区已经选出油 Excellent tree is to establish the material basis of forest seed orchard, is the breeding of the original material. Tree selection is from the same conditions, the same age (or similar) of the same species of natural forests or plantations, those outstanding growth, superior output, high quality, strong resistance to choose from individuals, and from Seeds and spikes were collected on the individual plants for propagation. Through the identification and comparison, single plants with good genetic quality were selected to establish scion or seed orchard as breeding base for breeding. My district has selected the oil