美洲商陆和拉巴豆在不同氮磷肥组合下的竞争效应  

Competitive effects between Phytolacca americana and Dolichos lablab under different nitrogen and phosphorus fertilization combinations

作　　者：王森森 乔国兰 刘蕾 陈桂华[1] WANG Sensen;QIAO Guolan;LIU Lei;CHEN Guihua(College of Agronomy,Hunan Agricultural University,Changsha,Hunan 410128,China)

机构地区：[1]湖南农业大学农学院,湖南长沙410128

出　　处：《湖南农业大学学报（自然科学版）》2022年第6期706-711,共6页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：农业农村部物种品种资源保护项目(131821301354051003)。

摘　　要：以美洲商陆(Phytolacca americana)和拉巴豆(Dolichos lablab)为试验材料,通过室外盆栽试验,研究它们在不同氮磷施肥组合(低氮、高氮、低磷、高磷、低氮低磷、低氮高磷、高氮低磷、高氮高磷)下的竞争效应。结果表明:拉巴豆单种及与美洲商陆混种中,施磷肥和混合施肥均显著提高拉巴豆叶的生物量和总生物量;美洲商陆单种及与拉巴豆混种中,高氮和高氮高磷处理均显著提高美洲商陆的株高、根生物量和总生物量;单种时,高氮高磷肥力处理下美洲商陆叶磷含量、根氮含量和根磷含量显著高于对照;混种时,在高氮高磷肥力处理下美洲商陆叶磷含量、根氮含量和根磷含量显著低于对照;拉巴豆单种及与美洲商陆混种时,拉巴豆叶氮含量、根氮含量均在高氮高磷肥力处理下达到最高,叶氮含量分别为67.17、66.62,根氮含量分别为62.07、66.31 mg/g;美洲商陆与拉巴豆混种时,在所有施肥处理下美洲商陆的相对产量均小于1.0,说明拉巴豆对美洲商陆有明显的种间竞争抑制作用。In this study,we performed outdoor pot experiments by use of Phytolacca americana and Dolichos lablab treated by a batch of combinations of nitrogen and phosphorus fertilization to study their competitive effects.The applied combination eight sets were low nitrogen,high nitrogen,low phosphorus,high phosphorus,low nitrogen and low phosphorus,low nitrogen and high phosphorus,high nitrogen and low phosphorus,high nitrogen and high phosphorus.The results showed that in single species of D.lablab and the mixed species with P.americana,phosphorus fertilizer and mixed fertilizer significantly increased the biomass and total biomass accumulation of D.lablab leaves.The plant height,root biomass and total biomass of P.americana were significantly increased by high nitrogen and high phosphorus treatments in both single species and mixed species of P.americana.Under the condition of high nitrogen and high phosphorus fertility,the phosphorus content in leaves,roots and roots of P.americana was significantly higher than that of the control.High nitrogen and phosphorus fertility treatment resulted that the phosphorus content in leaves,root nitrogen and root phosphorus of P.americana were significantly lower than those of the control.The leaf nitrogen content and root nitrogen content of D.lablab were the highest under the high nitrogen and phosphorus fertility treatment when it was single species or mixed with P.americana.The leaf nitrogen content was 67.17,66.62,and the root nitrogen content was 62.07,66.31 mg/g,respectively.With mixxing with D.lablab,the relative yield of Phytolacca americana was less than 1.0 under all fertilization treatments,and D.lablab had obvious inhibition on interspecific competition of Phytolacca americana.

关 键 词：美洲商陆 拉巴豆 氮磷组合 养分 植物竞争 

分 类 号：S451[农业科学—植物保护] S542