Research On The Law Of Decaying The Remainder Of Camellia Oleifera Regeneration

At present,increasing the growth of Camellia oleifera young trees mainly depends on the application of chemical fertilizers,which will lead to soil compaction and decreased fertility,and will also cause environmental pollution.As a new source of organic fertilizer,Camellia oleifera has the characteristics of large biomass and high nutrient content.Therefore,this paper provides a theoretical basis for maintaining the fertility of camellia oleifera forest and reducing the use of chemical fertilizers by studying the decomposition rule of oil tea camellia and its impact on soil fertility and oil tea growth.The research results are as follows:(1)The remaining treatment of Camellia oleifera shows that the early decomposition is faster and the later decomposition is slower.Cumulative decomposition rate over 7 months(53.04%)>pressure+decomposing agent(48.00%)>covering+decomposing agent(44.98%)>covering(36.55%).The decay rate and nutrient release rate of the overpressure treatment were significantly higher than that of the mulch treatment.The average cumulative release rate of nutrients was potassium>carbon>phosphorus>nitrogen.Carbon and potassium are continuously released with time,and nitrogen and phosphorus both show the "leaching-enrichment-release" change rule,and the enrichment rate is nitrogen>phosphorus.Adding a decomposing agent can significantly promote the decomposing speed,nutrient release and total decomposing rate and nutrient releasing rate in the early stage of the covering treatment,and has no significant effect on the turning treatment.(2)Different treatments of Camellia oleifera reforestation can improve soil physical properties.For the 0-20cm soil layer,reforestation for 1 month,the effect of each treatment on improving the physical properties of the soil is not obvious;when reforestation for 4 months,covering+decomposing agent treatment has a better effect on improving the soil physical properties;At 7 months,the pressure-reversal treatment has better properties for improving the soil physical effect.For the 20-40cm soil layer,the treatment of returning to forest for 1 month has no obvious effect on the physical properties of the soil;returning to forest for 4 months,mulching,overturning,overturning+decomposing agents have better effects on improving the physical properties of soil,among which The effect of mulch treatment was the best;the 7-month mulch,mulching and decomposing agent had better effects on improving the physical properties of soil.(3)Different treatments of Camellia oleifera reforestation can improve soil chemical properties.For the 0-20cm soil layer,the four treatments of reforestation in January,April,and July are all good for improving soil chemical properties,and the treatment of covering+decomposing agent is the best.For the 20-40cm soil layer,reforestation for 1 month,mulching,turning,mulching+decomposing agent treatment is better for improving soil chemical properties;when reforesting for 4 months,mulching,mulching+decomposing agent,turning The treatment of pressing+decomposing agent has better effect on improving soil chemical properties;when returning to forest for 7 months,all four treatment effects have better effects on improving soil chemical properties.(4)Different treatments of Camellia oleifera remnants can increase soil enzyme activity and microbial biomass.For the 0-20cm soil layer,the effect of covering treatment to improve soil enzyme activity and microbial biomass is better than that of pressure treatment.The covering treatment can significantly increase the soil acid phosphatase,catalase,urease and microbial carbon content;For the 40cm soil layer,the effect of overturning treatment on improving soil enzyme activity and microbial biomass is better than that of covering treatment.Overturning treatment can significantly increase soil acid phosphatase,urease and microbial carbon content.The addition of decomposing agents had no significant effect on soil enzyme activity and microbial biomass effects of mulching and overturning treatment.(5)Different treatments of Camellia oleifera reforestation can promote Camellia oleifera growth and nutrient accumulation.Among them,mulching and tumbling treatments promoted the height,ground diameter and new growth of Camellia oleifera.The mulching treatment can significantly promote the growth of tree height and ground diameter of Camellia oleifera.Tumbling treatment can significantly increase the crown of camellia oleifera and increase the accumulation of total potassium content in leaves.Adding a decomposing agent can significantly increase the accumulation of total nitrogen and total phosphorus in leaves after 1 month of turning treatment and 4 months of mulching.(6)According to the comprehensive analysis of the membership function analysis method combined with the principal component analysis method,it is concluded that after the Camellia oleifera residue is returned to the forest for 7 months,it has the best effect on improving the soil fertility of the 0-20cm soil layer.The order of the order is covering+decomposing agent>covering>turning+decomposing agent>turning,and the effect on improving soil fertility of the soil layer of 20-40cm soil is in order of turning+ decomposing agent>covering>covering+decomposing agent>Turning pressure,the effect of promoting the growth of camellia camellia in order of covering>turning pressure+decomposing agent>turning pressure>covering+decomposing agent.On the whole,the effect of reforestation coverage>cover+decomposing agent>pressure+decomposing agent>pressure reversal,adding decomposing agent reduces the reforestation effect of the cover treatment,but promotes the reforestation effect of the pressure treatment.