许多水生青饲料是以无性繁殖的方式延续后代，并且它们不耐寒冷，这就要考虑到母株的越冬问题。在冬天温度不太低的地区，母株在自然水域中即可自行越冬，次年春天又开始生长繁殖；而在冬天温度较低的地区，母株则会受冻而死亡．即不能自行安全越冬．要采取人工越冬措施。水生 Many aquatic green fodder extends offspring asexually, and they are not cold-tolerant, which takes into account the overwintering problem of the mother plant. In areas where the temperature in winter is not too low, the mother plant can wintering its own water in the natural waters and begin to grow and reproduce the following spring. In the areas with low winter temperatures, the mother plants will be frozen and die. That can not be safe and wintering. To take artificial winter measures. aquatic