桉树人工林间作禾本科牧草适应性筛选与评价

摘要

The biodiversity of vegetation reduction and biodiversity decline now are becoming a popular problem in eucalyptus plantation and intercropping is an important way to restore and reconstruct the biodiversity of Eucalyptus plantation. The preliminary results showed that Brachiaria dictyoneura cv. Reyan 14, Panicum maximum cv. Reyan 8, Panicum maximum cv. Reyan 9, Brachiaria brizantha cv. Reyan 6 showed the best suitability among grasses intercropped in eucalyptus plantation and there had higher dry matter yield, from 215.89 kg/hm2 to 475.42 kg/hm2, stronger drought resistantance also, with a survival rate 53.6%~76.6% and a coverage range 62.71%~90.42%.%桉树人工林单一种植引起植被多样性减少、生物多样性下降是普遍存在的问题,间作成为恢复与重建桉树林下植被多样性的重要途径.桉树人工林下间作禾本科牧草综合评价结果表明,热研14号网脉臂形草、热研8号坚尼草、热研9号坚尼草、热研6号珊状臂形草等牧草产草量达215.89 ～475.42 kg/hm2,旱季牧草产量占年产草量的14.08％ ～17.51％,在极端干旱条件下仍保持一定的生长和生物量的积累,植株存活率达53.6％～76.6％,覆盖度达62.71％～90.42％.间作牧草在桉树行间形成良好的覆盖层,提高了林地植被覆盖度,植株存活率较高,促进植被多样性的形成,对增加桉树人工林的群落组成、形成多层次片层结构有积极意义.