Greenhouse gases emissions of rangeland and livestock manure in the eastern Gansu Loess Plateau in summer

The three major greenhouse gas flux of fallow cropland, Alfalfa grassland, rangeland, sheep manure and pig manure in Longdong loess plateau were determined using static box method in August. The results showed that the methane emission values in study area of abandoned cropland, alfalfa land, rangeland, sheep manure and pig manure was -290.212, -204.18, -180.14, 47.84 and 33.59 mg(dm2)-1, respectively; CO2 emission values was 266.99, 418.72, 947.31, 6 110.63, 14 771.80 mg(dm2)-1, respectively; N2O emission values was -4.87, -2.56, 5.31, 1 050.55, 1 911.76 m(dm2)-1, respectively, and their total emissions were -8 395.69, -5 425.62, -2 012.6, 568 110.19 and 310 915.58 mg CO2(dm2)-1. These three studied grassland performed as carbon sink and rangeland had the best carbon sequestration effect. Manures performed as carbon source. These 3 greenhouse gas flux of pig manure and abandoned land soil had linear correlation with temperature in 7.5 cm soil. System greenhouse gas emissions of pig and sheep manure system had linear relation.