Study On Erosion Resistance Ability And Evaluation Of Sandy Coast Shelter Forest

Based on the anti-erosion study of5kinds shelter forest model and no forest land in the thecoastal sandy coast of Northern Jiangsu province, we measured soil physical and chemicalproperties, the forest root distribution, soil erosion rate, soil erosion resistance and corrosionresistance, drew the following conclusion:(1) The soil types of each forest stand mainly constituted silty clay loam, The average soilbulk density is1.28g/cm3, the salt content accounted for72%more than2g/kg, belonging tomoderate soil salinization, organic matter content is between5.9~27.45g/kg, the soil N, P, Kelements were mainly concentrated in the0~10cm layer. The soil fertility of Nakayama sugi,Jiangsuensis(hibiscus), Fraxinus Americana was relatively high,.(2) Each forest soil particles hydrostatic disintegration rate varies between46%to98%,from its average, contrast land>Nakayama sugi>Jiangsuensis(hibiscus)>Fraxinus americana>fast-growing poplar>Jiangsuensis(Photinia);Soil hydrostatic the disintegrating rate and soakingtime was cubic polynomial function,the general formula:S=b0+b1t+b2t2+b3t3.Each forest soilwater stable index:Jiangsuensis(hibiscus)>Nakayama sugi>Fraxinus americana> Jiangsuensis(Photinia)> fast-growing poplar> contrast land, on the whole showed a decreasing trend withsoil depth. the soil aggregates situation of Jiangsuensis(hibiscus), white wax, fast-growing poplarwas higher,and the corrosion resistance was better.Soil organic matter and corrosion resistanceindex was significantly correlated. The root weight of1~2mm diameter was ignificant positivecorrelation with reunion situation,and significantly negatively correlated with the dispersion rate.(3) Soil erosion rate increased with increasing rainfall, The average surface soil erosionrate of each forest stand: contrast land>white wax>fast-growing poplar>Jiangsuensis(hibiscus)>Jiangsuensis(Photinia). The soil erosion index of Nakayama sugi and Jiangsuensis(hibiscus) was higher than that of other stand,and each forest as follows:Jiangsuensis(hibiscus)> Fraxinus americana>Jiangsuensis (Photinia)>Nakayama sugi> fast-growingpoplar> contrast land. The soil erosion index was ignificant positive correlation with Bulkdensity,dispersion rate,water stability index,degree of aggregation,3~5mm range of water-stableaggregate content and size class0~1mm and1~2mm of fine root number.(4) Based on the principal component analysis,the composite score ranking of Soil erosionresistance was:Jiangsuensis(hibiscus)>Fast-growing poplar>Nakayama sugi>Fraxinusamericana>Jiangsuensis(Photinia)>Contrast land.Based on the gray relational analysisshowed that Nakayama sugi and Jiangsuensis(hibiscus) was best,Fast-growing poplar andFraxinus americanawas medium, Jiangsuensis (Photinia) was weak, Contrast land was worst.Comprehensive two results,Could be extended three Pattern as follows:Jiangsuensis+hibiscussyriacus+Hemerocallis fulva+Prunus cerasifera ehrhart+Populus deltoids; Nakayamasugi+Populus deltoids+hibiscus syriacu+Lonicera japonica+Prunus cerasifera ehrhart andFraxinus Americana+Populus deltoids+Ligustrum lucidum+Prunus cerasifera ehrhart...