Dynamics of Interspecific Competition of Legume-Grass Mixture under Different Mixed Sowing Patterns
The relative intensity of interspecific competition was investigated to reveal the approach of sustainable utilization and community stability in legume-grass mixed sowing patterns. The dynamics of interspecific relationship in four legume-grass combinations: 6 species mixture, 5 species mixture, 4 species mixture, 3 species mixture at three rowing ratios: 5 : 5,4 : 6,3 : 7 were studied. Stem height, relative density (RD), relative yield total (RYT) and interspecific competition rate (CR) were measured under different legume-grass mixed sowing patterns. The results showed that the stem height of both grass and red clover (Trifolium pratense) under mixed sowing patterns was lower than that of each under singled sowing patterns. However, the forage height of both alfalfa (Medicago varia) and sainfoin(Onobrychis vici-aefolia) was higher than that of each under singled sowing patterns. The forage height was increased rapidly during May 16 to July 1. Both RDl and RDg was significant higher than 1 (P<0. 05) for all the checked points and reached the highest during May 16 to June 1. RDl decreased with increasing row ratio of legume, whereas RDg increased. RYT was significant higher than 1 (P<0. 05) only at one check point May 16. In summer, RYT was lower than other period. Grass CRi gradually decreased during the period from May 1 to June 16, then increased after June 16. However, legume CRj gradually increased and then decreased during the same time. Grass CRt was stronger than that of legume at the most period. The interspecific competition was affected by light resources under different mixed sowing species and ratios, while temperature was another significant factor.
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万方数据
维普
