tree age造句

• Investigation of tugai forests formation ( vegetation map , tree ages , soil sampling ) at a still natural site with river relocation ( site in iminq ? k )
  通过植被图、年轮、土壤分析，在自然的胡杨林（移民且克）研究土加以森林形成过程。
• The bird community composed by the birds that nest on the ground only in younger manpower forest , and the bird community on ground replaced by birds that nest on trees following the increase of tree age
  在林龄较小的人工林中，鸟类群落仅由在地面繁殖的鸟类组成，随着林龄的增加，逐渐演替为树上营巢鸟类群落。