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为了探讨桉树-牧草复合种植模式的可行性和桉树是否影响牧草的营养成分,试验于2013—2014年在不同郁闭度的桉树林下套种桂牧1号杂交象草、山毛豆、圆叶舞草、非洲狗尾草、合萌、白花扁豆、速生槐等7种牧草,共设计了13种桉-草复合种植模式。结果表明:在不同郁闭度的桉树林下,桂牧1号杂交象草鲜草产量最高的套种模式是新造林(2 m×6 m),达232.35 t/hm2;其次是新造林(2 m×3 m)、萌芽林(2 m×4 m)、萌芽林(2 m×3 m);山毛豆鲜草产量最高的套种模式是新造林(2 m×6 m),达89.0 t/hm2,新造林与萌芽林间产量相比差异显著(P<0.05);在相同郁闭度桉树萌芽林(2 m×3 m)下套种牧草鲜草,再生性最好、生物产量最高的是桂牧1号杂交象草(115.79 t/hm2),其次是非洲狗尾草(94.27 t/hm2),山毛豆(62.53 t/hm2)居第三,圆叶舞草(43.36 t/hm2)居第四。桂牧1号杂交象草、山毛豆等牧草品种在桉树下套种与常规土壤种植的粗蛋白质、粗脂肪、无氮浸出物、钙、磷和氨基酸含量均差异不显著(P>0.05)。说明桂牧1号杂交象草、非洲狗尾草、山毛豆、圆叶舞草4个牧草品种适合在桉树下套种生长,而且桉树对牧草营养价值的影响不明显。
In order to explore the feasibility of eucalyptus-pasture compound planting mode and whether eucalyptus affects the nutritional content of forage grass, the experiment was conducted in the intercropping of Gui Mu No. 1 hybrid grass, mountain soybean, and leaf dance in different canopy density between 2013 and 2014 Grass, African Setaria, avenae, white lentils, Sophora japonica and other seven kinds of pasture, a total of 13 kinds of design eucalyptus - grass compound planting mode. The results showed that under the eucalyptus canopy forests with different canopy density, the highest intercropping pattern of fresh grass was (2 m × 6 m) in Gui Mu 1, reaching 232.35 t / hm 2; m × 3 m, 2 m × 4 m and 2 m × 3 m, respectively. The highest intercropping pattern of fresh mulberry grass was 2 m × 6 m, reaching 89.0 t / hm2, and there was significant difference (P <0.05) between the newly-planted and the sprouting forest production. The fresh-planted fresh grass under the same canopy density of eucalyptus sprout forest (2 m × 3 m) had the best regeneration and highest biological yield (115.79 t / hm2), followed by Setaria viridis (94.27 t / hm2), Shanzhaodou (62.53 t / hm2), and No.4 (43.36 t / hm2) . The contents of crude protein, crude fat, nitrogen-free extract, calcium, phosphorus and amino acids in the hybrid grass of Gui-Mu-1 and Shanzidou were not significantly different between the eucalyptus and the conventional soil (P> 0.05). The results showed that Gui Mu 1 hybrid grass, African Setaria, Mountain soybean, Musa grass four forage species suitable for growing under the eucalyptus, and eucalyptus on the nutritional value of forage is not obvious.