关键词: 土壤有机氮组分, 潮棕壤, 长期施肥

Abstract: Soil fertility comprehensively reflects soil properties and is the most sensitive dynamic indicator for integrated soil conditions. The spatial pattern of soil fertility may be impacted by different factors at different spatial scales. The spatial pattern and its impacting factors of soil fertility in West Lake Scenic Area were studied by grid sampling and the modified Nemerow formula was applied to quantitatively calculate soil fertility. The results showed that acidic soils (pH<6.5) dominated in West Lake Scenic Area. The average contents of soil organic matter and available P were at the 1st level of the soil nutrient classification standard in the second national general survey of China, while the average soil total N reached the 2nd level. Spatially, the integrated soil fertility in the north and south parts of West Lake Scenic Area was higher than in the northwest and southwest parts. Land use types, vegetation types and ecosystem types had significant effects on the spatial distribution of soil fertility. The soil integrated fertility index ranked in terms of land use types, vegetation types and ecosystem types, respectively as follows: residential area > traffic area > agricultural land > scenic greening space > mountain forest land, Quercus serrata var. brevipetiolata > Osmanthus fragrans > Cinnamomum camphora > Camellia sinensis > Phyllostachys edulis > Cyclobalanopsis glauca > Staphylea forrestii > Schima superba, and lawn > evergreen broadleaved forest > evergreen mixed forest. As a whole, greening landscape had higher soil fertility than agricultural soil and natural soil.

Key words: long-term fertilization, aquic brown soil, soil organic nitrogen form