| In this study, Haitou haizhou Bay, sides of Sheyang xingfu Road and Dafeng wangzhu sea-wall wereselected as experimental plots, and the nearby bare-lands as the CK plots. Soil physical and chemicalproperties were paid much attention. Monthly soil salinity and pH were measured from April to October. Andthe paper made the correlation between soil physical and chemical and cluster analysis. Results were asfollows:(1) With the shelter-forest gradual growing, its soil improvemental capacity much more stronger thanthat of the CK. Soil bulk density, non-capillary porosity from top to bottom gradually increased, which werelower than that of the CK. Total porosity, capillary porosity gradually decreased from top to bottom, whichwere slightly higher than that of the CK. The value of Soil organic matter, available nitrogen, availablephosphorus, available potassium in the mature shelterbelts, from top to down, gradually reduced, which werehigher than that of the CK. The pH value in the Locust, poplar, locust×poplar mixed, from top to bottomgradually increased, while the young forest lands and the CK were not. Cluster analysis results showed thatthe capacity of soil improvement were locust>locust×poplar mixed> poplar> the fourth forest stand, and thatin mature shelterbelts were stronger than that of young forest and the CK.(2) Correlation analysis results demonstrated that the soil bulk density, were negatively correlate to totalporosity and non-capillary porosity. Soil bulk density and capillary porosity was a significant negativecorrelation, and also to organic matter, total nitrogen, available phosphorus, was significantly associated withsoil pH. Total porosity and capillary porosity, non-capillary porosity showed a very significant. Organicmatter and total nitrogen showed highly significant correlation, and also to available nitrogen, availablephosphorus. Organic matter and pH was negatively correlated. Total nitrogen and available nitrogen,available phosphorus showed highly significant correlation, but with pH was highly significant negativecorrelation. Available nitrogen and available phosphorus were significantly correlated with pH wassignificantly negatively correlated. Available phosphorus and pH was highly significant negative correlation.Total Potassium and available Potassium was significantly correlated.(3)After soil monthly salt content of coastal forest land and the bare-lands of North Jiangsu provincewas determined and found, the shelterbelts' soil salt content was lower than the bare-lands. The general trendof soil salt content decreased top-down. From April to October, the layer (0~10cm) of soil salinity inwoodland was a "V" changes,its soil salinity minimum in July for1.23g/kg, the Middle (10~30cm) of soilcontent of an inverted "V" pattern changed in woodland, its highest soil salt content in July, as6.25g/kg,thebottom (30~60cm) of soil salinity in woodland changed slightly. From April to October, bare-lands' layer(0~10cm) of soil salinity increased first and then decreased, was up again, which was called inverted "S"Variation, the lowest salt content was in July and August. In bare-land, salt content of soil layer (10~60cm)changed slightly. (4)The pH value of woodland and bare-land, from April to October, were between7.85~8.73.Soil pH inwoodland was slightly lower than the light board.Soil layer (30~60cm) of pH in woodlands were higher thansoil layer (0~30cm), from April to October, Layers of soil pH showed a small decline trend. Soil pH ofbare-land from top to bottom gradually reduced. In bare-land, soil layer (0~30cm) pH from April to Octoberincreased first, then decreased, finally went up again, with the minimum value during the August, and thebottom (30~60cm) soil pH remained basically unchanged. |
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