测定古树的年龄是一项较复杂的工作。首先,查阅古籍、县志等历史资料,或金石碑文或遗留下来古建筑等文物资料;从访问当地老人和有关文化工作者过程中收集资料,依此推算出古树记载或栽植的基本年代。其次,用生长锥法测算出古树的理论树龄。第三,观察和测量古树的幼树在当地的生长规律,以便了解该树生长到取样部位所需要的年限。以银杏树为 Determining the age of old trees is a more complicated task. First of all, consult historical materials such as ancient books, county records, or cultural relics materials such as inscriptions on stone inscriptions or ancient buildings left behind; collect information from visits to local elders and cultural workers, and deduce the basic age recorded or planted by ancient trees. Secondly, using the growth cone method to calculate the theoretical age of ancient trees. Third, observe and measure the growth pattern of saplings in ancient trees in order to understand the time frame needed for the tree to grow to the sampling site. To ginkgo tree