Research on the Effect of Conservation Tillage Mode on the Suppression of Near-Surface Dust in Farmland

In order to explore the beneficial effects of conservation tillage (straw burial, stubble + straw mulching, mulching) compared with traditional on suppressing farmland dust and law wind erosion, PM2.5 PM10, in this study, according distribution characteristics particles “from large small” bottom top”, self-designed collector online monitoring system were used analyze amount dust, near surface farmland. A comparative study emission from is conducted two dimensions. The mobile tunnels are simulate verify release PM10 Among them, erosion shows that farming, mulching decreased by 29.37%, 40.73%, 36.61%, respectively, 90~250 μm large-size sand reduced 37.2%, 74.7%, 31.6%, respectively. results showed model farming reductions 42.5% 40.8%, significantly higher than burial modes. multiple linear regression analysis data concentrations had highest correlation speed, followed soil moisture temperature. Wind tunnel test verification following three protective modes: have apparent inhibitory released 1~8 m/s interval, concentration modes 15.34~41.17%, 32.05~48.56%, 28.85~42.40%, 19.44~36.47%, 35.90~52.00%, 25.83~50.63%, which consistent research show each suppression > burial. intended provide theoretical support for promoting return high-quality mulch field Beijing.