Application of different canopy resistance models in summer maize evapotranspiration simulation Analysis of agro-ecosystem footprint of flux in semi-arid areas Effects of straw incorporation and N fertilization on soil respiration during maize (Zea mays L.) growth in Huanghuaihai Plain Chill conservation of natural enemies in maize field with different post-crop habitats Species composition and characterization of weed community in maize fields in Hebei Province