草业学报2025，Vol.34Issue(3)：111-122,12.DOI:10.11686/cyxb2024139
饲用高粱与拉巴豆混播对种间关系及草地生产力的影响
Interspecific relationship and forage productivity effects in mixed sowings of Sorghum bicolor and Dolichos lablab
摘要
Abstract
The seeding rate of Sorghum bicolor and Dolichos lablab in mixed sowings is a key factor affecting the yield and nutritional value of mixed sowings.It is of high relevance to evaluate the optimal seeding rates of D.lablab and S.bicolor in mixed sowings in the Ningxia Yellow River Irrigation Area,to alleviate the shortage of forage supply in this area.In this study,D.lablab was sown at four different seeding rates in mixtures(SL1:16.5 kg·ha-1,SL2:33.0 kg·ha-1,SL3:49.5 kg·ha-1,SL4:66.0 kg·ha-1),sown together with S.bicolor at 18.0 kg·ha-1 in each case.The experiment also included D.lablab and S.bicolor monocultures(L0:49.5 kg·ha-1 and S0:18.0 kg·ha-1).The aim was to investigate the yield,interspecific competition indexes and economic benefits of the two monocultures and the mixed-sown combinations.The results for two years confirm that the total hay yield and crude protein yield from mixed sowings of S.bicolor and D.lablab were significantly higher than those of monocultures(P<0.05),and were maximized in the SL2 treatment.For yield and crude protein,respectively,values were 63.66% and 9.13% higher than those of D.lablab sown alone.The land equivalent ratio of all mixtures was greater than 1 and was highest for the SL2 treatment(1.26),making the yield increase of this treatment was obvious.The aggressivity of S.bicolor in the mixed sowings was greater than 0,and the competitive ratio was greater than that of D.lablab,indicating that the competitive strength of S.bicolor was stronger than that of D.lablab,and S.bicolor is a competitive advantage crop.The system productivity index increased progressively with increase in the seeding rate of D.lablab,and the net income over the two years under the SL2 treatment was the highest(37469.45 and 38284.09 yuan·ha-1)among the treatments.Based on the yield,land equivalent ratio,monetary advantage index and net income of the mixed swards,the performance of S.bicolor and D.lablab in SL2 mixed seeding treatment was the best.Therefore,it is recommended that the optimum seeding rate of D.lablab and S.bicolor in the Yellow River Irrigation Area of Ningxia is 33.0 kg·ha-1.关键词
饲用高粱/拉巴豆/混播草地/种间竞争/生产性能Key words
Sorghum bicolor/Dolichos lablab/mixed grassland/interspecific competition/production performance引用本文复制引用
马江萍,张译尹,王腾飞,王斌,兰剑..饲用高粱与拉巴豆混播对种间关系及草地生产力的影响[J].草业学报,2025,34(3):111-122,12.基金项目
宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01)和"一年两熟"人工草地可持续发展模式研究与示范项目(2020BBF02001)资助. （草学学科）
