Study Of Planting Sarcandra Glabra Under Eucalyptus Plantations

For fingding out the highest yield and the best mode of comprehensive benefit in each intercropping pattern,put three Eucalypt-Sarcandra glabra intercropping patterns,do not plant sarcandra glabra as contrast,study the growth of eucalyptus the growth of grass Sarcandra glabra,the change of Soil nutrient and analysis the comprehensive benefit of each intercropping pattern.(1)All three eucalypt-Sarcandra glabra intercropping patterns can promote the growth of eucalyptus in the yrial period,the mode 2 was the best because its individual volumeincreased 0.0156 nm3/hm~2 · year,1hich compared with the control,can increase the volume of 25.74 m3/hm~2 ·year.(2)Mode 1 and mode 2 can significantly improve the survival rate of sarcandra glabra.Compare the 6 months of growth betweenthree mode,the height,stem diameter,fresh biomass on the ground of mode 2 were the highest,the mature plants of model was the highest,the height,stem diameter,fresh biomass on the ground of model were after mode 2,all the growth increment of mode3 were the lesat.Use the fresh biomass on the ground to evaluate the yield of three modes,the yield of the model was the highest at 12 months,the yield of the mode2 was the highest at 18 months.In the 6 months growth comparison,mode2 grow highest.(3)Analysis the change trend of soil nutrients in thisthree modes and control group,the results showed that,the organic matter,total nitrogen,total phosphoras,available nitrogen had no significant difference between three modes and control group,but the change trend of the available nitrogen showed a downward trend as time goes on;The total potassium,available phosphorus,effective potassium had significant difference between them,and the total potassium of control group descend lowest;The available phosphorus between them showed a downward trend first and a rising trend after as time goes on,but the control group was on the contrary;The effective potassium of mode 2,mode 3and control group howed a downward trend first and a rising trend after as time goes on,but the mode 1 was on the contrary.Therefore,come to the conclusion that,topdressing nitrogen to the three modes all over the whole cycle interplanting,topdressing phosphate fertilizerto the three modes in the early interplanting,topdressing potassium fertilizer to mode 2 and mode 3 in the early interplanting and topdressing potassium fertilizer to mode 1 in the late stage of intercropped.(4)Calculate the annual cost of each modes and control groupn and hypothesized the operating period is 20 years,the annual cost of mode 3 was the highest,14805 RMB/hm~2,followed by the mode 2 11340 RMB/hm~2,the least is the control group,3150 RMB/hm~2.Statistics the output value increment of sarcandra glabra and eucalyptus,and comparing with the controlgroup,mode 2 has the highest comprehensive benefits,can increase the net output 11859.9 RMB/hm~2a year,followed by the mode 1,6004.95 RMB/hm~2,the least is mode 3 526.2RMB/hm~2.