Study On Optimization Of Structure Of Gugertree Welfare Based On Multi-functional Management

Wood Load is a kind of excellent greening and timber species,and it is also a good fire-resistant,fire-resistant and flame-retardant tree species.Muhe is a precious timber species in China.The trunk is straight,the material is tough,the structure is meticulous,durable,and easy to process.It is the superior material for making yarn and yarn tube in the textile industry;it is also a bridge,ship,vehicle,building,Excellent materials such as farm tools,furniture,plywood,bark and leaves contain tannins,which can be extracted from tannins.Muhe is a good fire forest.The species of Schima superba plantation has a single structure,low biodiversity and productivity,and serious pests and diseases,which makes the multi-functionality of Schima superba plantation low.Therefore,improving the multi-functional benefits of plantations has become an urgent problem that forestry workers need to solve.The structure determines the function,rationally adjusts the stand structure,optimizes the stand space structure from the angular scale,the mixed degree and the size ratio,and realizes the multi-functional benefit of the stand.Based on the theoretical basis of near-natural management of plantation forests,this paper studied the structural characteristics and multi-functional characteristics of Schima superba plantation forests in different age groups,and evaluated the multi-functional evaluation system.Based on the multi-functional level of Schima superba plantation in different age groups,combined with the analysis results,the optimization scheme of thinning and replanting was constructed.Through the adjustment of stand structure of different age groups,the Schima superba plantation of different age groups tends to be near-natural state and enhance multi-functionality.Benefits,the analysis results are as follows(1)Structural characteristics analysis of the stands of Schima superba in different age groups.The high and diameter structures of Schima superba plantation trees were analyzed by Weibull distribution.The results showed that the standard deviation of the diameter structure of the stands increased with the increase of age,the young forests tend to be concentrated,the small diameter steps are more,the near mature forests and The middle-aged forests tend to be discretely distributed,with many small and medium-sized steps.Only the No.9 plot of the near-maturing forest and the No.4 plot of the middle-aged forest meet the Weibull distribution curve,and the other seven plots do not conform to the Weibull distribution curve.The high structural standard deviation of Schima superba plantation is accompanied by the gradual increase of forest age.The young forest trees are highly concentrated and concentrated,with saplings being dominant.The near-mature forests and middle-aged forest trees are highly concentrated,with high tree biased,except middle-aged forests.One piece of plot and nearly mature forest did not conform to the Weibull distribution function,and the other seven plots were consistent with the Weibull distribution function.By analyzing the spatial structure characteristics of the forest stands of different age groups,the competition level among forest trees is moderately competitive,the spatial isolation of forest stands is low,and the spatial distribution pattern is cluster-like distribution.Therefore,the diameter of Schima superba plantation The structure,tree height structure and spatial structure are unreasonable,and the forest structure optimization needs to be adjusted to make it close to the natural state.(2)Analysis of multifunctional levels of Schima superba plantation in different age groups.Four types of multi-functional evaluation indexes of soil and water conservation,water conservation function,species diversity function,carbon fixation function and productivity function were selected to analyze the multi-functional level of Schima superba plantation in different age groups.The results showed that the soil water holding capacity of different age groups was significantly different,and the soil porosity was the highest in the middle-aged forest,showing a trend of increasing first and then decreasing.The soil bulk density was the highest in the middle-aged forest,which was also the trend of increasing first and then decreasing.The species diversity function of different age groups increased year by year,and the species diversity of near-mature forests reached the highest value.The shrub layer,litter layer and arbor layer of different age groups increased year by year,the near-mature forest was the highest,the herb layer decreased year by year,and the middle layer of soil layer was the highest,showing a trend of increasing first and then decreasing.Changes in productivity functions tend to be consistent with carbon sequestration.The analysis shows that the multi-functional levels of Schima superba plantation in different age groups are all low and the multi-functional benefits are low.(3)Structure optimization scheme for stand of Schima superba plantation in different age groups.Through the structural analysis results of the stands of Schima superba plantation in different age groups,the optimization scheme of the thinning and replanting of Schima superba plantation was established,and the structure of Schima superba plantation was adjusted.The spatial structure of stand was greatly adjusted.The number of plantation forests was greatly improved,and combined with the woodland conditions and growth characteristics of different age groups,the most suitable native tree species were selected to improve the species diversity of forest stands.The different age groups of Schima superba were all clustered before adopting management measures.After optimization of thinning structure and optimization of replanting structure,the Schima superba plantations of different age groups were randomly distributed,and the degree of mixedness was greatly improved.Sexual richness has increased significantly.