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采用山毛豆(Tephrosia candida)、184柱花草(Styiosanthes guianensis)和桂牧1号杂交象草(Pennise-tun americanum×Pennisetum purpureum)×Pennisetum purpureumcv.Mott在桉树林下间种,间种方式有2种:桉树密度3 m×2 m,行间间种牧草;桉树密度6 m×2 m,行间间种牧草。不间种为对照。目的是探索在桉树林下间种牧草后,对桉树林地土壤肥力,地表径流量的影响。经2年试种,与本底调查情况(种植前)相比,种植密度A(3 m×2 m)林地土壤pH、有机质、全量N、全量P2O5、速效P和代换性Mg均表现出不同程度的提高,增幅为7.59%~110.00%;土壤A层有机质含量比桉树纯林平均提高14.47%,比本底调查平均提高35.54%。种植密度B(6 m×2 m)林地土壤pH、有机质、全量N、全量P2O5、速效P和代换性Mg均表现出不同程度的提高,增幅为2.78%~135.71%;土壤A层有机质含量比桉树纯林平均提高57.45%,比本底调查平均提高36.76%。桉树间种牧草的地表径流量与桉树纯林相比,2年桉树+桂牧1号模式地表径流量分别降低了30.82%和21.07%。桉树林下间种牧草,不但可增加土壤矿质元素的含量,而且还能促进桉树的生长,减少了水土流失,保护了生态环境。
Two species of inter-species were planted under the forests of Eucalyptus using Tephrosia candida, Styiosanthes guianensis and Pennise-tun americanum × Pennisetum purpureum × Pennisetum purpureum cv. : Eucalyptus density of 3 m × 2 m, between the line of forage grass; Eucalyptus density 6 m × 2 m, interplanting grass. Inconsistent as a control. The purpose is to explore the effects of grazing grass under eucalyptus forests on soil fertility and surface runoff in eucalyptus forests. After 2 years of trial planting, the soil pH, organic matter, total N, total P2O5, available P and alternative Mg in the planting density A (3 m × 2 m) were all higher than those in the background (before planting) The soil organic matter content in soil layer A increased by 14.47% on average compared with the pure eucalyptus forest, which was 35.54% higher than the average of the background soil survey. The soil pH, organic matter, total N, total P2O5, available P and alternative Mg in the planting density B (6 m × 2 m) showed an increase of 2.78% ~ 135.71%, and the content of organic matter in layer A Compared with pure eucalyptus forest, the average increase of 57.45%, than the average increase of 36.76%. The surface runoff of eucalyptus species was 30.82% and 21.07% less than that of pure eucalyptus forest in 2 years, respectively. Under the eucalyptus forest, forages can not only increase the content of mineral elements in the soil, but also promote the growth of eucalyptus, reduce soil erosion and protect the ecological environment.