Method for reducing nitrogen and phosphorus non-point source pollution of dry land

The invention discloses a method for reducing nitrogen and phosphorus non-point source pollution of dry land, which comprises the following steps: firstly, taking FGD (Flue Gas Desulfurization) gypsum for fastening excessive phosphorus of dry land soil, thereby reducing runoff loss of soluble phosphorus and realizing the emission reduction for the in-situ phosphorus in a farmland; secondly, constructing a channel pond wetland system and performing biological fixation and efficient nitrogen and phosphorus removal; and lastly, fertilizing wetland plants and returning to the field, thereby reducing the investment of chemical fertilizer soluble nitrogen and phosphorus. According to the method, the resisting control is simultaneously performed at three aspects of generating process, period after running off and pollution source, so that the purpose of controlling the nitrogen and phosphorus pollution of the dry land is achieved. According to the method provided by the invention, the in-situ emission reduction for