Studies On The Restoration Ecological Mechanism Of Eucalyptus In The Southeastern Tablelands Of Australia

Generally and systematically studied and discussed on the eucalypt woodland ecosystem about degraded causes, courses, phases and restoration methods in Southeastern Tablelands of Australia. Decline of species, structure and function of eucalypt woodland was resulted mainly by man-made disturbance factors, which included clearing and grazing activities. Those factors interacted with natural disturbance factors and impacted on the eucalypt recruitment in their natural distribution regions.Eucalypt recruitment effects were discussed under six vegetation states, which divided by the degree of clearing and grazing and some other factors as well. Seedling recruitment was much better when the vegetation was uncleared, perennial native grass were dominated and little grazing occurred in the same time. There was very nice regeneration when the rainfall range was 700 mm to 800 mm. Highest and lowest temperatures and soil types were not crucial factors on the recruitment. The eucalypt seedling numbers per ha were much higher on bottom rather than crest and slope. Eucalypt preferred to have seedlings in low salinity areas. The percent of perennial native grass in the understory played an important role in eucalypt recruitment.The ability of regeneration was significantly difference between eucalypt species. Comparison of Monocalyptus and Symphyomyrtus species showed that Symphyomyrtus species could be more tolerant on the disturbed environment than Monocalyptus species and their seedlings distributed in wider range areas.E. blakelyi, E. melliodora and E. bridgesiana etc. could be utilized to restore the eucalypt woodlands in Southeastern Tablelands in Australia as pioneers to enlarge the remnant woodland areas. Perennial native grass could be attracted in the modified woodland and provided suitable environment for tree recruitment. Local dominant species should be protected. Declining the man-made disturbance factors and facilitating degrades ecosystems to back to the progressive succession route should be done in the future.