Impact of karst rocky desertification on growth of eucalyptus plantation

To better understand the growth of Eucalyptus on the land of different grades of rocky desertification in karst region，and explore the method for the revegetation in karst rocky desertification land，two grades（S1：moderate desertification，S2：severe desertification）of rocky desertification land in Northwest Guangxi were selected for planting Eucalyptus. On the desertification land，the planting bank was built by brick，new soil from other site was filled in the bank before planting tree. The survival rate and growth of Eucalyptus were investigated in the 4th year of forestation. The results showed that，The survival rates of Eucalyptus in land S1 and S2 were 29.5% and 21.5%，respectively，the former was 1.37 times of the latter.The average diameter at breast height（DBH），average height， stock volume of Eucalyptus in S1 and S2 were 9.01 and 6.72 cm，8.41 and 6.43 m，17.65 and 5.95 m3/hm2，respectively，the former were 1.34，1.31 and 2.97 times of the latter，respectively. Bedrock bare rates in S1 and S2 were 4.17% and 14.11%. The results indicated that， the suruival rate and grouth index of Eucalyptus in severe rocky desertification were significantly lower than those in the moderate rocky desertification environment. At the same time，by treatment，the grade of rocky desertification decreased to low-grade.