A Study on Frost Injury and Restoration on Pueraria wallichii

Pueraria wallichii, as a pioneer tree species in dry-hot river areas in Yunnan was planted in a large scale. It has many merits, such as it can resist to drought but not to cold, grow fast in warm areas and can easily sprout. A frosty disaster lasting in 1999 caused frost damage in different degrees to Pueraria wallichii. Based on the analysis on the frost injury in different areas, the paper concludes that(a) The plant can grow when the lowest temperature per day is higher 0 ℃;(b)It begin to suffer from frost injury, while the day continuing with lower than 0 ℃ of the lowest atmospherature per day exceed 3 day and its injury degrees vary with altitude and landform. The injured plants can sprout next spring even if the parts of above ground wilt.