Effects Of Different Treatment Methods Of Harvest Residue On Soil And Plant Community After Clear-cutting Of Phyllostachys Edulis

The ecological damage caused by the expansion of Phyllostachys edulis in the subtropical regions of my country has become a difficult problem for ecological restoration.Understanding the natural restoration status of the slash community and soil after clear-cutting of Phyllostachys edulis can provide guidance for the ecological restoration of the damage area of Phyllostachys edulis.In this study,two treatment methods,namely,Harvest residue uncleaned recovery site(UR,Harvest residue uncleaned recovery site)and Harvest residue cleaning recovery site(CR,Harvest residue cleaning recovery site),were set up in the clear-cutting site of Moso bamboo forest in Tianmushan National Nature Reserve,Hangzhou City,Zhejiang Province.A control sample plot(CK)was set up in the uncut moso bamboo forest,and the arbor layer,shrub layer and herb layer in the sample plot were observed and recorded every year,and the soil in the sample plot was collected in the fifth year after clear felling.,chemical and extracellular enzyme activity assay.Research indicates:(1)The dominant species in the arbor layer in the restoration site are deciduous broad-leaved tree species such as Zanthoxylum molle and Mallotus apelta.The main dominant tree species did not change significantly.The main dominant species in CR were Zanthoxylum molle and Mallotus apelta.The main dominant species are prickly ash,Ailanthus altissima,Sassafras tzumu,etc.The two are slightly different;the dominant species in the shrub layer are camellias such as Camellia oleifera and Camellia fraterna.The family(Theaceae Mirb.)is dominated by species,but the interannual variation is large.The dominant species of CR are(Camellia oleifera),(Lindera glauca).The dominant species in the herb layer were mainly sedges and grasses such as(Carex brunnea)and(Phaenosperma globosa),and the dominant species were relatively stable.The dominant species of CR and UR were the same.(2)Species diversity in the restoration site was significantly restored;compared with 2018,the CR arbor layer species Shannon-Wiener diversity index,Simpson dominance index,Margalef richness index and Pielou evenness index changed by 4.6% in 2020,1.1 %,14.7 % and-1.3 %,UR was 5,2 %,0,28.5 % and-4.3 %;the variation of CR shrub layer diversity index was 26.8 %,-4.2 %,-47.0 %and 21 %,respectively,UR was 5.1 %,2.2 %,-16.1 % and 13.8 %;the variation of CR herbal layer diversity index was-45.8 %,-25.0 %,-57.2 % and 0,UR was-10.1 %,0,-24 % and 13.7 %;theα-diversity index of the arbor layer of CR was higher than that of UR,and the α-diversity index of shrub layer and herb layer was lower than that of UR.(3)The physical properties such as soil bulk density were significantly improved.Compared with CK,the soil bulk density of CR and UR decreased significantly,by 31 % and 14 % respectively.higher than CK;the water holding capacity of UR soil is better than that of CR.(4)The content of main nutrients such as soil organic carbon was significantly increased.The contents of soil organic carbon,total nitrogen,total phosphorus,alkali-hydrolyzed nitrogen and available potassium in CR and UR were all higher than those in CK.etc.;available phosphorus showed that CR was significantly lower than UR and CK;due to the retention of cutting residues after clear-cutting of bamboo forest,UR soil organic carbon,total nitrogen,total phosphorus,alkali-hydrolyzed nitrogen,and available phosphorus were extremely significantly higher than CR,The rate of increase is between 33% and 99%.(5)The activities of several main extracellular enzymes in the soil were significantly enhanced.The activities of urease,β-glucosidase and peroxidase in the soils of CR and UR were higher than those of CK;The output range is between 46% and 98%.(6)The correlation analysis and calculation showed that the correlation between the soil physical index and the diversity index on the restoration site was weak,and only the total porosity in the 0-10 cm and 10-20 cm soil layers was significantly correlated or negatively related to the diversity index.Correlation relationship;soil chemical index has a strong correlation with species diversity index,and each soil index has a significant or negative correlation with different diversity indices;soil extracellular enzyme activity has a weak correlation with species diversity index,and the two In the soil layer,only β-glucosidase had a strong correlation with the diversity index,and soil urease,acid phosphatase and peroxidase were all weakly correlated with the diversity index.(7)The comprehensive evaluation results showed that the slashed lands were well restored,and the comprehensive scores of soil and species diversity in the restored slashes after clear-cutting of the moso bamboo forest were higher than those of the control moso bamboo forest,in the order of UR>CR>CK.