Number of Tree Seeds 1997

Tree seed production indicator: number of tree seeds per plot (sum of all four subplots within each cluster-plot), by species, at Bear Brook Watershed, Maine, in 1997.

林木种子生产指标：1997年美国缅因州贝尔布鲁克流域（Bear Brook Watershed）按物种分类的每群状样地林木种子数量，其中每个群状样地的种子数为该样地内全部4个子样地的种子总数之和。