Abstract: Effects of different intensities of pig forage disturbance on plant community diversity nd soil physicochemical properties in meadow wetlands in Napahai Natural Reserve were studied. The results showed that the species number, plant diversity (including indexes of Shannon diversity, Margalef richness, and Pielou evenness), and biomass (below and aboveground) decreased as the grazing intensity increased. As the soil depth increased, the soil bulk density decreased first and then increased under light-intensity forage but its change was reversed under medium to heavy disturbance. The content of soil organic matter decreased as the grazing intensity increased. The soil organic matter content also decreased with the increase of soil depth, especially in the upper layer. Unreasonable grazing of pig was the main reason causing decrease in plant diversity, destruction of soil structure, and decline in content of soil organic matter.

Key words: long-term experiment, chemical fertilizer combined with organic fertilizer application, N and P balance, eco-economic benefit