man-made forest 基本例句 人工林 Research on log rule of timbers from artificial masson pine forest.马尾松人工林材种出材率表的研究。 When primitive subalpine abies forest was deforested to cropland, soil carbon stock and its stability decreased.人工林土壤呼吸速率大于天然次生林，农地和草地呼吸速率最低。