The geographical origin and cultivation origin of cultivated plants. Yang Shixiong (2007) believes that the geographical origin of plants refers to the natural process of a taxonomic group on the earth from scratch, which has occurred before human emergence, and the time is based on the geological time (million years) unit to calculate. According to the th eory of evolution, each taxonomic group evolved from other common ancestors. Therefore, geographic origin is the unit origin. Geographic origin studies the origin of wild plants and only involves wild species.
The origin of cultivation refers to the process of artificial domestication of wild plants, which is closely related to human utilization. The origin of cultivated plants is often in the distribution of their wild species, which can be either unitary origin. It can also be a multi-source, because humans only domesticate species of useful value. The subjects of research on the origin of cultivated plants include wild species and cultivars. The time of cultivation origin is obviously far behind the geographical origin. Because the history of human farming civilization is more than 10,000 to 20,000 years, the history of cultivation origin is almost negligible relative to geographical origin. It can be seen that it is obviously impossible to find evidence from geological changes to explore the geographical origin of tea trees, as well as to explore the geographical origin of tea trees in human social history and agricultural archaeological activities.
