Effects Of Mix-sowing Of Coronilla Varia L. And Bromus Inermis Leyss. On The Forage Quality And Soil Properties In Coal Mining Subsidence Area

The experiment was conducted to study the different row ratio of Coronilla varia L.and Bromus inermis Leyss,0:10,2:8,3:7,4:6,5:5,6:4,7:3,8:2 and 10:0,on forage productivity,nutritional quality,mycorrhizal infection rate and soil properties in the coal mining subsidence area of Xiaoyi city,Shanxi Province,so as to explore a new mode of soil reclamation and utilization in coal mining subsidence area and provide some theoretical basis for the recovery of ecological environment in coal mining area.The results show that:1.The relative yield total(RYT)was above 1 in different mixed sowing ration of Coronilla varia L.and Bromus inermis Leyss.,which can effectively utilize the ground and underground space in the coal mining subsidence area to promote the growth of each other.The competitiveness rate of Bromus inermis Leyss is above 1 in the Mix-sowing Rations of C2:B8,C3:B7 and C4:B6 so that the competitiveness rate of Bromus inermis Leyss.is greater than Coronilla varia L.In the same way the competitiveness rate of Coronilla varia L.is above 1 in the Mix-sowing Rations of C5:B5,C6:B4 and C7:B3 as a result the competitiveness rate of Coronilla varia L.is greater than Bromus inermis Leyss..2.The content of NDF,ADF and ADL were gradually reduced with the increase of the mix-sowing ratio of Coronilla varia L..The highest crude fat(EE)content was C2:B8,followed by C10:B0,and the lowest crude fat content was C8:B2.The highest CP content was C10:B0,followed by C8:B2,and the lowest crude fat content was C0:B10.The highest Ash content was C2:B8,followed by C10:B0,and the lowest Ash content was C7:B3.3.Forage quality and productivity in different mix-sowing ration was comprehensively evaluated with grey correlation analysis.The comprehensive evaluation ranking was as follows:C4:B6>C10:B0>C7:B3>C8:B2>C3:B7>C6:B4>C5:B5>C2:B8>C0:B10.4.The mycorrhizal infection rate was significantly improved for Coronilla varia L.and Bromus inermis Leyss.in the mix-sowing model.The highest mycorrhizal infection rate is C6:B4 for Bromus inermis Leyss.and C2:B8 for Coronilla varia L..5.Soil nutrient content decreased with the increase of soil depth at the range of 30 cm so that it was highest in the soil depth of 0 to 10 cm than 10-20 cm and 20-30 cm.The highest content of NO3--N,NH4+-N,available P,available K,organic matter in 60 days were respectively the treatment of C4:B6,C3:B7,C10,B0,C10,B0,C10,B0 and accordingly in 120 days were the treatment of C4:B6?C3:B7?C0:B10?C10:B0?C0:B10.With the growth and development of forage grass,the soil nutrient elements of grassland with different mixed-sowing ratio also changed.