[Estimation of the effect derived from Tianjin suburban wind erosion open source on central district].

In some Chinese cities air pollution is serious, and the major pollutant is still PM10. The source apportionment results show: wind erosion dust is an important source of particulate matter. So the contribution of this source should be calculated. The suburban land of Tianjin was classified based on Landsat TM satellite image, and samples of different land use types were taken. The soil textures were determined with the analysis of soil samples by the laser particle analyzer and GIS-based interpolation computation. The wind erosion modulus, wind erosion fluxes, dust release modulus and dust release fluxes were calculated in four seasons in suburban of Tianjin (Beichen, Xiqing, Jinnan and Dongli). The wind erosion fluxes in spring, summer, autumn and winter were 21236.31, 4435.21, 7272.13 and 17204.4 t in 2009; the wind erosion fluxes in Beichen, Xiqing, Jinnan and Dongli were 6380.23, 32 881.13, 8 340.67 and 2 546.02 t in 2009; the wind erosion fluxes from cultivated land and forest grassland were 49 599.2 and 548.85 t, respectively. The soil dust release fluxes in Tianjin suburban were 9 352.92 t (particle size < 10 microm), 20 587.99 t (particle size 10-15 microm)and 13 873.74 t (particle size 15-20 microm). In 2009, there were 20 592.91 t soil dusts with particulate diameter of 20 microm or less that were transmitted from suburban to central district, and 4 395.89 t with particulate diameter of 10 microm or less, about 21.35%.