Soil And Water Nutrient Loss And Litter Nutrient Return In Different Utilization Patterns Of Pinus Massoniana Stand In Changting,Fujian

Soil erosion is one of the main reasons to cause nutrient loss on slope terrain.Vegetation litter is one of the main factors to maintain soil fertility,promote nutrient cycling and energy flow.Therefore,through the selection of Changting,Typical Red soil erosion area of Southern China,Interplanting economic crops and raising Hetian-chicken under Pinus massoniana forest are selected as the research objects.The economic crops are:Myrica rubra,Soapberry,Gardenia jasminoides,Camellia Oleifera.The Pine massoniana Forest as the control plots.Analysis of runoff plot,litter frame and indoor experiment.Effects of interplanting models of Pinus massoniana under different stands on soil and Water loss,soil and Water nutrient loss and nutrient regression of litter.The main conclusions are as follows:1.The annual runoff for Myrica rubra,Soapberry,Gardenia ja sminoides,Camellia Oleifera,Chicken breeding and Pinus massonia na are 81.2mm,109.2mm,520.239mm,507.618mm,414.426mm,104.427mm.Followed by Gardenia jasminoides>Camellia oleifera>C hicken breeding>Soapberry>Pinus massoniana>Myrica rubra.The soil loss amount for 6 models followed by Gardenia jasminoides(211.915kg·hm-2)>Camellia oleifer(211.457kg·hm-2)>Chicken breeding(178.21 kg·hm-2)>Soapberry(65.0283kg·hm-2)>Pinus massoniana(52.247kg·hm-2)>Myrica rubra(5.343kg·hm-2).2.The nutrient loss for different models of N,K,P followed by Myrica rubra<Pinus massoniana<Soapberry<Chicken breed ing<Camellia oleifera<Gardenia jasminoides.N nutrient loss followed by Myrica rubra<Pinus massoniana<Soapberry<Chicken breeding<Camellia oleifera<Gardenia jasminoides.K nutrient loss followed by Myrica rubra<Pinus massoniana<Soapberry<Chicken breeding<Camellia oleifera<Gardenia jasminoides.P nutrient loss followed by Myrica rubra<Pinus massoniana<Soapberry<Chicken breeding<Camellia oleifera<Gardenia jasminoides.3.The total annunal litter of 6 models in The total annual litter of 6 models in order of Myrica rubra(5574.96kg·hm-2·a-1)<Chicken breeding(2696.68kg·hm-2·a-1)<Soapberry(2546.82 kg·hm-2·a-1)Pinus massoniana(1854.53 kg·hm-2·a-1)<Gardenia jasminoides(1750.62 kg·hm-2·a-1)<Camellia oleifera(1209.69 kg·hm-2·a-1).Among the different components of different models,the percentage of leaf litter components was the largest,reaching 63.91%?86.87%.The proportion of litter components in the annual litter is different among different stand types.The largest litterfall of leaf components is in Pinus massoniana,and the percentage of chicken breeding is the most in branch,bark and other components.The flower component is the Soapberry,and the proportion of the fruit component is the largest under the forest Camellia oleifera.4.There are significant monthly dynamic changes of litter in different interplanting patterns of Pinus massoniana.The pattern of Myrica rubra,Soapberry and Gardenia jasminoides showed tyipeak,while the chicken breeding showed dualpeak.the Camellia oleifera and Pinus massoniana belong to irregular type.The litter amount of each component of different stand types also has obvious monthly dynamic rule.Pearson correlation analysis of litter components and total litter quantity showed that there is a negative correlation between litters and leaves,branches and flowers,among which there is a significant negative correlation between litters and litters.The litter amount in different stands is compared and analyzed.There is no significant difference between Soapberry and Chicken breeding,Gardenia jasminoides and Pinus massoniana in litter quantity in the undergrowth forest(P>0.05),but significant difference in the other two stands(P<0.05).Under the economic model of 6 Masson pine forests,the litter quantity of different stands is not significant(P>0.05),and the difference is not significant(P>0.05)in 6 kinds of Pinus massoniana forest.There was significant difference between the litter leaves and other components(P<0.05).5.The annual average nutrient contents of different interplanting models of Pinus massoniana are as follows:Myrica rubra,Camellia oleifera and chicken breeding are N>K>P,and the other three models are K>N>P.The contents of N in the litter flowers and others are high in different components.The content of.K in the litters and fruits is lower than that in the leaves and branches,the contents of P in other components are higher in litters and flowers,and the contents in litters,flowers and fruits are very low.The nutrient return amount of K,P,N in 6 Pinus massoniana interplanting stands is in order of the following order:Myrica rub ra(18.516kg·hm-2)>Soapberry(10.293kg·hm-2)>Pinus massoniana(4.235kg·hm-2)>Chicken breeding(3.912 kg·hm-2)>Gardenia jasminoides(3.065kg·hm-2)>Camellia oleifera(2.0O1kg·hm-2).The annual return of the three nutrient elements is in the order of K(21.231kg·hm-2)>N(13.0kg·hm-2)>P(7.780kg·hm-2).The litter nutrient utilization eff iciency of different Masson Pine intercropping patterns was followe d by Chicken breeding>Camellia oleifera>Gardenia jasminoides>Pinus massoniana>Myrica rubra>Soapberry.6.The relationships between rainfall-runoff,between rainfall-soil loss among six Pinus massoniana forest interplanting models are all power function.The linear function is used to fit the nutrient loss of soil loss-K and the nutrient loss of runoff-N.There is no uniform equation between soil loss-N,and the fitting degree between runoff-P nutrient is higher than that of power function.7.The annual nutrient loss and annual litter nutrient return between different Pinus massoniana interplanting models are higher than those in Myrica rubra,Soapberry and Pinus massoniana forest.The nutrient return of litter in the other three models is lower than that of nutrient loss.The best benefit of soil and water conservation is Myrica rubra and the worst was the Gardenia jasminoides.