Soil Quality And Its Influencing Factors In Urban Green Space

Soil quality comprehensively reflects soil properties and is the most sensitively dynamic indicator for integrated soil conditions. The spatial pattern of soil quality was reported to be impacted by different factors in terms of different spatial scales. The spatial pattern and its impacting factors of soil quality in West Lake Scenic Area were studied by grids sampling. The modified Nemerow formula was applied for quantitative calculation of soil quality. The results showed that:A significant accumulation in soil Cu, Zn, Pb and Cd was found, and part of the samples has reached of pollution in West Lake Scenic Area. Cr and Ni accumulation has an individual phenomenon. Four heavy metals (Cu, Zn, Pb, Cd) element content were higher than other types of land in traffic area soil. As a whole, the integrated soil pollution in the northeastern parts of West Lake Scenic Area was higher than the other part, and these area is highly urbanized area.The soil was dominated by acidic (pH<6.5). The average soil organic matter and available P contents reached at the 1st level of the soil nutrient classification standard in the second general survey. While average soil total N reached the 2nd level. As a whole, the integrated soil fertility in the north and south parts of West Lake Scenic Area was higher than the northwest and southwest parts. Different land uses, vegetation types and ecosystems have significant effects on the spatial distribution of soil fertility. The soil integrated fertility index ranked in terms of different land uses, vegetation types and ecosystems, respectively as follows:residential area> traffic area> agriculture land> scenic spot> forest land, Quercus serrata var. brevipetiolata> Osmanthus fragrans> Cinnamomum camphora> Camellia sinensis> Phyllostachys edulis> Cyclobalanopsis glauca> Staphylea forrestii> Schima superba, green ground> evergreen broad-leaved forest> evergreen mixed forest.