Contratest Investigation on Seven Clones ofEucalyptus MultiplaceForestation inM iddle??subtropics of Fujian

Contratest investigat ion on 7 clones ofE ucalyp tus in the m iddle-subtrop ics of Fu jian w as conducted andthe resu lt show ed that the adaptability, fast-grow th and cold-resistance ofE. grandisN o 3 w ere strong, the g row th incrementw as h igh, the stability w as better, it could bear the low temperatures of - 4~ - 4. 5 ?? . The adaptability,fast-g row th and co ld-resistance ofE. grandis No 1, DH 184-1 and DH201-2 were stronger, the yie ld w as h igher, thestability w as excellen,t they could bear the low temperature of - 3. 5~ - 4. 0 ?? . They were suitab le to be planted inFu jian m iddle-subxropica l areaw ith average temperature above 19 ?? ; The fast-g row th ofE. saligna #E. exserta No 9w ere generic but its resistant to co ld w as lim ited, could on ly bear low temeratures o f - 2. 0~ - 2. 5 ?? , the rate offreeze in juryw as h igh. The co ld-resistance ofE. camaldulensisNo 1and No 3 w ere strong, cou ld bear the low temperatures of - 5 ?? , but the ir fast-g row th w ere poor and y ie lds w ere low. Moreover, the variability of th is three clonesw as b ig and the stab ilityw as not good, the adapt ive areaw as narrow, they cou ld on ly f it to p lant on local small areasand d idn? t advocate deve lopment in them idd le-subtrop ics of Fu jian.