山毛豆/桉树间种系统中植物生长对施N与根系隔离的响应  

Responses of Plant Growth to N Application and Root Separation in Intercropping System of Tephrosia candida and Eucalypt

作　　者：刘晓璐 韦铄星[2] 蒋燚[2] 高风 王智慧 刘雄盛[2] 欧汉彪 刘菲[2] Liu Xiaolu;Wei Shuoxing;Jiang Yi;Gao Feng;Wang Zhihui;Liu Xiongsheng;Ou Hanbiao;Liu Fei(Guangxi State-owned Yachang Forest Farm,Baise,Guangxi 533000,China;Guangxi Forestry Research Institute,Key Laboratory of Central South Fast-growing Timber Cultivation of National Forestry and Grassland Administration,Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning,Guangxi 530002,China;Central South University of Forestry and Technology,Changsha,Hunan 410004,China)

机构地区：[1]广西壮族自治区国有雅长林场,广西百色533000 [2]广西壮族自治区林业科学研究院,国家林业与草原局中南速生材繁育重点实验室,广西优良用材林资源培育重点实验室,广西南宁530002 [3]中南林业科技大学,湖南长沙410004

出　　处：《广西林业科学》2022年第1期17-22,共6页Guangxi Forestry Science

基　　金：广西自然科学基金项目(2017GXNSFBA198065);广西林业科技项目(桂林科字[2016]第3号)。

摘　　要：为探索山毛豆(Tephrosia candida)和桉树(Eucalyptus spp.)间种系统内物种相互作用的途径和机制,量化种间竞争对植物生长的影响,采用盆栽试验,研究施氮(-N、+N 105 mg/kg)和根系隔离(完全分隔、尼龙网分隔和不分隔)处理对系统中植物生长的影响。结果表明,+N处理显著提高桉树的株高、地径、生物量、N浓度和吸N量,显著减少山毛豆根瘤数量和重量。根系不隔离处理显著提高桉树的株高、地径、生物量和吸N量,显著增加山毛豆根瘤数量和重量。施N或根系隔离处理对山毛豆的生物量和N浓度影响不明显,对吸N量影响较大。山毛豆/桉树间种系统中,桉树生长所需的N主要来源于土壤,山毛豆生长所需的N有部分来源于生物固氮;山毛豆对桉树生长的促进作用以根系相互交叉接触产生养分传递为途径,但随土壤N含量增加,作用呈减弱趋势。In order to clarify pathways and mechanisms of species interaction and quantify effects of interspecific competition on plant growth in intercropping system of Tephrosia candida and eucalypt,pot experiment was conducted to investigate effects of N application(-N,+N 105 mg/kg)and root separation treatments(complete separation,mesh separation and no separation)on plant growth.Results showed that+N treatment significantly increased plant height,ground diameter,biomass,N concentration and N acquisition of eucalypt,but significantly reduced number and weight of root nodules of T.candida.By no separation treatment,plant height,ground diameter,biomass and N acquisition of eucalypt were significantly increased,and number and weight of root nodules of T.candida were significantly increased.Effects of N application or root separation treatments on biomass and N concentration of T.candida were not significant and effect on N acquisition was significant.N for eucalypt growth in intercropping system of T.candida and eucalypt mainly came from soil.N for T.candida growth partly came from biological N fixation.Promotion effect of T.candida on growth of eucalypt was through cross contact of roots to produce nutrient transfer,but effect was weakened with increase of N content in soil.

关 键 词：植物生长 施N 根系隔离 山毛豆/桉树间种系统 

分 类 号：S753.53[农业科学—森林经理学]