北方植物引种到南方（The northern plants were introduced into the South）.doc

北方植物引种到南方（The northern plants were introduced into the South） As the saying goes, orange is born in Huainan, orange, while in Huaibei, it is trifoliate orange.. Yanzi old gentleman has demonstrated this ecological reason. The introduction of the northern plants to the south, the following aspects are not suited: 1. climate; 2. sunshine time; 3. landforms; 4. air humidity; 5. temperature and so on. Summer heat will die, the temperature is too high, resulting in bad growth; winter is not cold enough, will lose vernalization effect. There is not enough low temperature to guide flower bud differentiation, and no flower bud naturally can not blossom and fruit Sunshine is short of flower bud differentiation, southern light a long time of Winter Wheat in North China belongs to the semi winter or winter, long sunshine is the need for a certain period of time during Vernalization and a certain period of time (8~12 hours) in order to continue the growth and development, otherwise it will not be heading fruit or difficult seeding time. The South has no low temperature phase relative to the north, and the sunshine is short. The plant of nature (photosensitivity, temperature sensitivity, basic nutrition growth, to consider the introduction of three) time. Generally speaking, from northern to southern China, the growth period of varieties will be shortened, so the varieties with longer growth period in North China should be introduced. If it is a plant, it mainly considers the adaptability of its temperature and light intensity. If you are in need of production, it is recommended to take a look at relevant theories. With the upgrading of flower industry, the original flower resources have been obviously unable to meet the needs. Therefore, it is necessary to introduce flower resources from the field, among which the north of the South and the north of the south are the most common. It is easy for people to pay attention to the north of South China, but the north is often overlook