关键词: 烟蒜轮作, 烟蒜套作, 根际土壤, 无机磷组分, 有机磷组分

Abstract: Landscape naturalness reflects the spatial and temporal distribution of landscape elements, which is of great significance to improve ecosystem integrity and stability. Using GIS and AHP (Analytic Hierarchy Process), we analyzed the changes of landscape naturalness in Jinchuan Jinshui Lake National Wetland Park of Gansu Province by interpreting the remote sensing images in 2003, 2009, and 2015. The results showed that landscape diversity index, evenness index and patch richness increased over time, while landscape dominance and landscape separation decreased. Most ecological function indices increased, including habitat provision, function maintenance of plant community, weighted average patch fractal dimension of area, and vegetation coverage increased. The ecological disturbance indices such as artificial disturbance index and average area of artificial landscape showed decreasing trends. The landscape naturalness index of wetland parks increased from 0.4761 in 2003 to 0.7485 in 2015. The implementation of wetland park conservation and restoration project changed land cover structure, enhanced the stability, ecological elasticity and service value of ecosystem, and greatly improved the landscape naturalness of Jinshui Lake National Wetland Park.

Key words: tobacco garlic crop rotation, tobacco garlic crop intercropping, rhizosphere soil, inorganic phosphorus fraction, organic phosphorus fraction.