桉树林内间种山毛豆试验初期生长效应

Initial Growth Effect of Eucalyptus Intercropping with Tephrosia candida

为改善桉树林地地力,开展了桉树间种山毛豆(Tephrosia candida)作绿肥试验。对在桉树林内间种山毛豆3种不同密度(10600、12500、16400株/hm^2)的植株产量、养分含量及桉树林分树高、胸径生长量进行了分析。结果表明,不同密度间山毛豆单位面积植株产量无显著差异,但以12500株/hm^2处理的产量最高,比产量最低的10600株/hm^2处理高137.3%;1年生的山毛豆植株贮藏的氮、磷、钾养分含量分别是34.9、2.0、11.3kg/hm^2;桉树林2.5年生时,无论是否间种山毛豆或不同山毛豆密度处理的桉树林分树高、胸径生长量均无显著差异。

In order to improve the soil fertility of Eucalyptus forest,experiment of intercropping Eucalyptus with Tephrosia candida as green manure was carried out. The yield and nutrient content of T. candida were analyzed with three interplanting densities (10 600,12 500 and 16 400 plants per hm^2). Tree height and DBH increment of Eucalyptus were analyzed at the same time. Results showed that there was no significant difference in plant yield per unit among different densities,but the yield of 12 500 plants per hm2 was the highest, which was 137.3% higher than that of 10 600 plants per hm^2 with the lowest yield. The nitrogen,phosphorus and potassium contents of 1-year-old T. candida were 34.9 kg/hm^2,2.0 kg/hm^2 and 11.3 kg/hm^2,respectively. There were no significant differences in tree height and DBH increment of 2.5-year-old Eucalyptus whether interplanted T. candida or not.