Abstract: Agricultural non-point source (AGNPS) pollution has become one of the main pollution modes of earth surface environment. Understanding on the relationships between landscape pattern and AGNPS pollution is crucial for further cognizing the occurrence mechanism of AGNPS pollution. This study quantified the relationships between landscape pattern and AGNPS pollution in 13 watershed units of Shitoukoumen Reservoir by detrended canonical correspondence analysis (DCCA). The results showed that the first two DCCA axes significantly correlated to forest area ratio, vegetation index, landscape cohesion index, Shannon’s diversity index, farmland ratio, and rural built-up land ratio explained 92% of the relationships between landscape pattern and AGNPS pollution in study area, suggesting that DCCA was an effective method. The characteristics of nutrients discharge from watershed units changed significantly with landscape pattern gradient.

Key words: Fargesia denudata, Density, Biomass distribution pattern