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一、概况隆缘桉(Eucalyptus exserta)在湛江专区桉树中栽植面积最多,一般占桉树用材林80—90%以上。在雷州牛岛和合浦东南部,从1955—1961年建立了大面积连片的隆缘桉林,单雷州林场和山口林场营造的隆缘桉林就约有40万亩。这个地区地势平坦,沿海风大,蒸发大,土壤沙质重,腐殖质少,干旱瘦瘠,加上初期造林质量不高,多采用裸根苗、小穴、浅锄、密植,抚育松土又沒有跟上去,以致有相当部分的桉林,生长很差(三、四类林),表现“密密麻麻、弯弯曲曲、歪歪倒倒”,生长很慢,
I. Overview Eucalyptus exserta (Eucalyptus exserta) Zhanjiang area planted in the most eucalyptus, timber generally accounts for more than 80-90% of timber. In Leizhou Ushimado and southeastern Hepu, from 1955 to 1961 to establish a large area contiguous eucalyptus eucalyptus, single Leizhou Forest Farm and erected in Longkou Eucalyptus forest about 40 million mu. The area is flat, coastal wind, evaporation, heavy sandy soil, less humus, arid barren, with low initial quality of afforestation, use more bare root shoots, small holes, shallow hoe, close planting, Up, so that a considerable part of eucalyptus forest, poor growth (three, four kinds of forest), the performance of "dense, winding, crooked down, slow growth,