热带作物学报2017，Vol.38Issue(8)：1411-1417,7.DOI:10.3969/j.issn.1000-2561.2017.08.006
混播比例对热研2号柱花草和飞机草早期生长竞争能力的影响
Effects of Mixed Sowing Proportion on the Competitive Ability Between Stylosanthes guianensis cv. Reyan No. 2 and Chromolaena odorata During Early Growth
摘要
Abstract
The experiment was conducted to investigate the competitive interaction between Stylosanthes guianensis cv. Reyan No. 2 and Chromolaena odorata (L.) R. M. King & H. Robinson at different mixed sowing proportion, and to explore the methods of controlling the invasive weed C. odorata displaced by S. guianensis. The above two species were grown for 30 days at 5 mixed sowing proportions (8 plants total number per pot, and plant numbers proportion of S. guianensis and C. odorata were 8:0, 6:2, 4:4, 2:6 and 0:8 per pot) in the pot experiment. The growth response and relative competitive ability of the two species were evaluated at same watering treatment ( 1 time/2d, 70% of the maximum water-holding capacity of the soil per watering). As S. guianensis mixed sowing number decreased, the relative plant height, relative average growth rate, relative total biomass per plant, relative biomass of total biomass allocation to root, stem and leaf of S. guianensis and C. odorata both gradually decreased. For C. odorata, the relative root length, relative biomass ratio of root to shoot and root biomass fraction gradually decreased, stem biomass fraction no significant change, and leaf biomass fraction gradually increased with decreasing of S. guianensis numbers at mixed sowing, but the corresponding indexes of S. guianensis were just contrary. When the rate of S. guianensis to C. odorata was 6:2, the relative yield totals of two plants was significantly greater than 1, and there was no interspecific competition between two mixed sowing plants, but the relative yield totals and 1 did not have significant difference when mixed sowing proportions were 4:4 and 2:6, and had resource competition between the two plants. Competitive balance index of S. guianensis was significantly less than 0 under the mixed proportion 6:2, 4:4, and 2:6. These indicated that the relative competitive ability of S. guianensis was weaker than that of C. odorata during early growth. Further experiment is needed to study the competitive changes of the two plants in the whole growth period and the effects of fertility and cutting management on the competitive abilities to determine whether C. odorata could be the replacement control by using S. guianensis as a competitor.关键词
飞机草/热研2号柱花草/生物量分配/替代控制Key words
C. odorata/S. guianensis cv. Reyan No. 2/biomass allocation/replacement control分类
农业科技引用本文复制引用
李雪枫,王坚,朱朝华,黄咪咪..混播比例对热研2号柱花草和飞机草早期生长竞争能力的影响[J].热带作物学报,2017,38(8):1411-1417,7.基金项目
海南省自然科学基金项目(No. 312062) （No. 312062）
海南大学青年基金项目(No. HDqnjj1211). （No. HDqnjj1211）
