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桉树在华南地区广泛分布,是多种用途的速生用材和薪材树种。但纯林连续多代经营易引起林地土壤物理性质恶化,地力衰退,木材产量下降,因而期望通过树种混交来保持和培肥地力。我们从1982年开始在琼海县阳江镇林场和上埇乡林场选择根瘤发达,枯枝落叶量大,具有固氮改土能力,且幼树阶段耐一定程度庇荫的大叶相思和黑荆进行混交试验。现将3年观测结果初报如下。
Eucalyptus widely distributed in southern China, is a multi-purpose fast-growing timber and firewood species. However, successive generations of pure forests can easily lead to the deteriorating of the physical properties of forest soils, the decline of soil fertility and the decline of timber production. Therefore, it is expected that soil fertility will be maintained and fertilized through tree species mixing. We started in 1982 in Yangjiang Town, Qionghai County Forest Farm and Shangxu Township selected nodules developed, litter large, with nitrogen and soil improvement ability, and the sap stage of a certain degree of shade shade of Acacia mixed with black alley test. The 3-year observation results are as follows.