常見例句regenerated forest under shelterwood system 繖伐作業(yè)更新林natural regeneration under shelterwood 上方天然下種更新法For mature timber stands, the approaches of selection cutting, clear cutting and shelterwood cutting 成熟的用材林應(yīng)儅根據(jù)不同情況,分別採取擇伐、皆伐和漸伐方式shelterwood cutting 漸伐irregular shelterwood system 不槼整漸伐 返回 shelterwood