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为探明尾巨桉引种新区林木生长量及土壤理化特性,在桂西北乐里林区设置尾巨桉连续年龄序列观测样地,对林分胸径、树高、蓄积量及其土壤理化性质进行测定。结果如下:1)1～4a生尾巨桉胸径平均总生长依次为5.0,8.0,9.7和10.7cm;树高平均总生长依次5.1,8.8,11.2和12.1m;林分平均总蓄积依次为8.29,31.76,51.45和71.89m3/hm2。2)林地(0～100cm)土壤容重为1.188～1.498g/cm3,总孔隙度为46.79%～59.90%,其中非毛管孔隙度为10.34%～28.50%。3)土壤pH值为5.44～5.60;有机质含量为0.78%～2.51%;全N和全P含量分别为0.04%～0.11%;全K含量为0.40%～0.50%;速效K(42.7～63.5mg/kg)>有效Mn(5.91～22.59mg/kg)>速效P(1.4～6.8mg/kg)>有效Zn(0.61～1.72mg/kg)>有效B(0.07～0.35mg/kg)。研究结果表明,桂西北乐里林区尾巨桉引种新区林地土壤容重较大,土壤主要养分含量普遍缺乏,林木生长量较低。
In order to investigate the growth of new trees and soil physical and chemical properties in the introduction of Eucalyptus urophylla, the continuous DBH observation sample plots were set up in Lelelin of northwestern Guangxi Province. The DBH, tree height, stock volume and soil physical and chemical properties Determination. The results are as follows: 1) The average DBH growths of 1 ~ 4a Eucalyptus urophylla were 5.0, 8.0, 9.7 and 10.7 cm in sequence; the average total tree height growth was 5.1, 8.8, 11.2 and 12.1 m, , 31.76, 51.45 and 71.89m3 / hm2.2), respectively. The bulk density of soil ranged from 1.188 to 1.498g / cm3 in woodland (0-100cm). The total porosity was from 46.79% to 59.90%, and the non-capillary porosity ranged from 10.34% to 28.50%. 3) Soil pH 5.44 ~ 5.60; Organic matter 0.78% ~ 2.51%; Total N and total P 0.04% -0.11%; Full K 0.40% ~ 0.50%; Available K (42.7 ~ 63.5mg / kg> available Mn (5.91 ~ 22.59mg / kg)> available P (1.4 ~ 6.8mg / kg)> effective Zn (0.61 ~ 1.72mg / kg)> effective B (0.07 ~ 0.35mg / kg). The results showed that the bulk density of soil in the new area of Eucalyptus urophylla × E.grandis grown in Le Lily forest area in northwestern Guangxi Province was relatively large, the main nutrient contents in soil were generally lacking, and the growth of trees was low.