A.形成時(shí)期B.速生時(shí)期C.成長(zhǎng)時(shí)期D.成熟時(shí)期
A.速生時(shí)期B.近熟時(shí)期C.成熟時(shí)期D.衰老時(shí)期
A.造林B.間苗C.林窗D.間伐