【摘要】 为有效提升桉树(巨尾桉Eucalyptus urophylla×E. grandis)人工林的土壤地力及改善林木生长,2019年6月—2020年5月,在广西东门林场进行桉树林下套种豆科Fabaceae绿肥(白灰毛豆Tephrosia candida,TC;田菁Sesbania cannabina,SC)的田间试验,分析林下土壤理化性质的变化,调查桉树生长状况,探究绿肥套种对桉树人工林生长的影响。研究结果表明:套种白灰毛豆和田菁套种一年后,桉树林下土壤有机质含量较对照组(不套种)分别增加了9.66%和18.44%;土壤速效氮、磷、钾含量也有显著增加(P<0.05);桉树林木的单位面积材积增量比对照分别增加了46.81%和35.47%。采用模糊数学法对土壤肥力进行评价,并计算土壤肥力指数(IFI),结果表明,绿肥套种可增加IFI值(SC>TC>CK)。进一步的相关性分析表明,桉树树高与IFI呈极显著正相关(P<0.01)。可见,桉树人工林套种绿肥能够有效提升地力,促进桉树的生长,但不同绿肥品种的效果存在差异。本研究结果可为桉树人工林的套种绿肥种类选择及可持续经营提供参考。更多还原

【Abstract】 On June 5^th, 2019, experiments were condcut on interplanting Tephrosia candida and Sesbania cannabina under Eucalyptus urophylla×E. grandis plantation in Dongmen Forest Farm of Guangxi. On May 15^th, 2020 determinations were implemented on soil nutrient content, tree growth.The results showed that interplanting T. candida and S. cannabina increased soil organic matter by 9.66% and 18.44%, as well as soil available nitrogen, phosphorus and potassium（P<0.05）, unit area timber volume increased by 46.81% and 35.47%, compared with that of the control. Using the Integrated fertility index（IFI） was evaluated by fuzzy mathematics method. Results suggested that IFI was followed by interplanting S. cannabina> T.candida>CK. Regression analysis indicated that the tree height had significantly positive relation with IFI（P<0.01）.更多还原