Experimental Study on the Cold Tolerance of Cinnamomum camphora L.

The aim of the research was to provide basis for the introduction of Cinnamomum camphora L.in middle and northern cities.C.camphora was planted in urban areas and suburb respectively to compare the growth status of C.camphora and observe its cold tolerance.Compared with planting in the suburb,C.camphora plated in the urban areas was not easy to suffer freezing damage.Tender branches of C.camphora were easy to suffer low-temperature freezing damage,but the roots didn't suffer freezing damage.For C.camphora with close tree-age,their individual differences of cold tolerance were little.And for C.camphora with great difference of tree age,their individual differences of cold tolerance were larger.The elder the tree age was,the more hardly they suffered freezing damage.When the minimum temperature was lower than-10 ℃,the limbs of field young trees were very easy to suffer freezing damage,but they could continue to germinate and grew into big trees after the frozen limbs were cut.When the temperature was slightly lower than-10 ℃,big trees of C.camphora grown in field might not suffer freezing damage or only their tender branches and leaves suffered slight freezing damage.C.camphora can be introduced in the urban areas of Zhumadian.And small trees of C.camphora in the field and urban areas demand to take cold-proof measures and avoid the occurrence of freezing damage.