Acta Agrestia Sinica ›› 2017, Vol. 25 ›› Issue (5): 1088-1096.DOI: 10.11733/j.issn.1007-0435.2017.05.024

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Effects of the Mixed Sowing Ratio and Watering Frequency on the Inter-specific Competition between Stylosanthes guianensis ‘Reyan No.2’ and Mimosa invisa during Early Growth

LI Xue-feng1, ZHAO Qing-jie2, WANG Jian1   

  1. 1. Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, Hainan Province 570228, China;
    2. College of Applied Science and Technology, Hainan University, Danzhou, Hainan Province 571737, China
  • Received:2016-11-02 Revised:2017-09-18 Online:2017-10-15 Published:2018-01-25

混播比例和浇水频率对热研2号柱花草和巴西含羞草生长早期种间竞争的影响

李雪枫1, 赵庆杰2, 王坚1   

  1. 1. 海南大学热带农林学院, 海南 海口 570228;
    2. 海南大学应用科技学院, 海南 儋州 571737
  • 通讯作者: 王坚,E-mail:wangjian901@163.com
  • 作者简介:李雪枫(1974-),女,宁夏隆德人,博士,讲师,主要从事植物保护与资源利用教学与研究,E-mail:xfli0922@163.com
  • 基金资助:

    海南省自然科学基金项目(312062);海南大学青年基金项目(HDqnjj1211)资助

Abstract:

In order to clarify the inter-specific competitive interaction between Stylosanthes guianensis ‘Reyan No.2’ and Mimosa invisa and to explore the methods of controlling the invasive weed M. invisa by displacing it with S. guianensis, the effects of 5 mixed sowing proportions (plant numbers proportion of S. guianensis to M. invisa were 8:0,6:2,4:4,2:6 and 0:8 per pot) and 4 watering frequencies (1 time·1d-1, 1 time·3d-1, 1 time·5d-1 and 1 time·7d-1, 70% of the maximum water-holding capacity of the soil per watering) on the growth of 2 plants were studied by pot experiment. The results indicated that the total biomass, root/shoot ratio, biomass allocation, plant height, growth rate, and leaf area index of S. guianensis were gradually lower than monoculture with decreasing mixed proportion of experimental plant numbers, and M. invisa vice versa. When the ratio of S. guianensis to M. invisa were less than 4:4, the growth performance and various growth indexes of S. guianensis decreased significantly, but M. invisa increased significantly. Watering frequency at 1 time·3d-1 was beneficial to the biomass accumulation, elongation growth and preferential distribution for stem and leaves of S. guianensis, but 1 time·5d-1 was more helpful to M. invisa. Therefore, increasing seeding rate to insure the plant number of S. guianensis in community at more than 1:1, and supplying water at 1 time·3d-1 of watering frequency and 70% of the maximum water-holding capacity of the soil of watering amount every time will be a promising strategy for replacement control of M. invisa by using S. guianensis as a competitor.

Key words: Mimosa invisa, Stylosanthes guianensis ‘Reyan No.2’, Biomass accumulation, Replacement control

摘要:

为明确热研2号柱花草(Stylosanthes guianensis ‘Reyan No.2’)与巴西含羞草(Mimosa invisa)生长早期的种间竞争关系,探索巴西含羞草替代控制的途径和管理策略,在盆栽条件下,设置5种柱花草和巴西含羞草分株数混播比例(柱:巴=8:0,6:2,4:4,2:6,0:8)、4种浇水频率(1次·1d-1,1次·3d-1,1次·5d-1和1次·7d-1),研究了2种植物的生长变化情况。试验结果表明:随着柱花草混播占比的减少,柱花草的单株总生物量、根冠比、根茎叶各部分生物量、株高、生长速度和叶面积指数均比单播时逐渐降低,而巴西含羞草的各对应指标均逐渐增大;柱:巴小于4:4会使柱花草的各生长指标显著降低,而巴西含羞草的显著增加。有利于柱花草总生物量累积、伸长生长和生物量优先向茎叶分配的浇水频率为1次·3d-1,巴西含羞草为1次·5d-1。因此,要利用热研2号柱花草替代控制巴西含羞草,首先注意柱花草的播种量,确保柱花草在群落中的成株比例大于1:1,还要保障其营养生长早期浇水频率达1次·3d-1,每次浇水量为土壤最大持水量70%。

关键词: 巴西含羞草, 热研2号柱花草, 生物量累积, 替代控制

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