广西桉树速生丰产林调查与经济效益评价

Survey and Economic Benefit Evaluation on Fast-growing and High-yielding Eucalyptus SPP Plantation in Guangxi

通过对广西全区12个单位桉树速生丰产林实地调查发现：（1）广西目前规模栽培的4个无性系丰产性能好,其中DH32-26品系的蓄积生长量达48.45m3/hm2.年;（2）不同土壤类型,以赤红壤土桉树生长量最大,平均45.19m3/hm2,砖红壤、红壤土桉树生长量稍小,平均蓄积年生长量分别是40.25m3/hm2和40.74m3/hm2;（3）12个单位桉树速生丰产林2年9个月～2年11个月的造林投入（不含土地租金、利息）平均为21015元/hm2,是一般树种造林费用的2～3倍。桉树造林资金投入量与投资效益并不成正比,单位面积投资效率为1.27～2.70,最佳投资为1.7万～2万元/hm2。

Through field survey of fast-growing and high-yielding Eucalyptus spp plantation of twelve units in the whole Guangxi, it was found that the annual growth volume reached 37.5-49.8m3/ha per year, 42.23 m3/ha per year in average. It was also found that （1） currently four clones by scale cultivation in Guangxi had good yield per- formance, among which, the growth volume of clone DH32-36 reached 48.45 m~/ha per year; （2） different types of soil. Eucalyptus spp on lateritic red soil had largest growth, with 45.19 m3/ha per year in average, Eucalyptus on latosol and red soil had smaller growth, respectively with 40.25m3/ha and 40.74m3/ha per year in average; （3） the twelve units＇ plantation input （excluding land rent and interest） on fast-growing and high-yielding Eucalyptus spp plantation for two years and nine months to two years and eleven months was 16 290 Yuan to 29940 Yuan per ha, 21015Yuuan per ha in average, which was two to three times of plantation cost for general species. Plantation capi- tal input of Eucalyptus spp was not proportional to its investment return, its investment efficiency per unit area was 1.27 to 2.70, and the best investment was 17000 Yuan to 20000 Yuan per ha.