香梨果园套种苏丹草对土壤养分及产草量的影响

探讨库尔勒香梨果园套种苏丹草对果园土壤性状的影响和产草量。果园内,分别设距树干0.5m处外和1.5m处外2个采样区,测定采样区内苏丹草产量和0~60cm土层的土壤容重及土壤养分。结果表明,离树干1.5m处外干草产量为2.25kg/m^2,显著高于离树干0.5m处外的1.34kg/m^2。离树干0.5m处外0~20、20~40cm土层地下生物量分别为81.26g/m^2、14.38g/m^2约为离树干1.5m处213.62g/m^2、32.89g/m^2的38.03%、56.27%,且90%以上的牧草根量分布在0~20cm的果园土层,苏丹草与果树的根系几乎无重叠现象。可见,香梨果园套种苏丹草对土壤性状及养分无负面影响,1a可以收草3次,其产草量可达大田产量的60%左右。

Effect of Interplanting Sudan Grass on Soil Nutrients and Herbage Yield in Pear Orchard

This paper discussed the effect of Sudan grass interplanting in Koerle fragrant pear orchard on soil characters and grass yield.In the orchard,two sampling areas were set,0.5 m and 1.5 m away from the tree trunk,respectively,to determine the herbage yield of Sudan grass and soil bulk density and soil nutrients of 0-60 cm soil layer in the sampling areas.The results showed that herbage yield of the sampling area 1.5 m away from the trunk was 2.25 kg/m^2,significantly higher than the yield of the sampling area 0.5 m away from the trunk (1.34 kg/m^2).The underground biomass of soil layer 0-20 cm and 20-40 cm 0.5 m away from the trunk were 81.26 g/m^2,14.38 g/m^2,respectively,about 38.03% and 56.27% higher than those of the sampling area 1.5 m away from the trunk,which were 213.62 g/m^2,32.89 g/m^2,respectively.More than 90% of the herbage roots were distributed in the 0-20 cm soil layer,and there was almost no overlap between the roots of Sudan grass and Orchards.In conclusion,there was no negative impact on properties and nutrients in the pear orchards interplanting with Sudan grass,and it could harvest grass three times a year and the grass yield could reach about 60% of the field production.