Effects of tillage patterns on photosynthetic and chlorophyll fluorescence characteristics of maize in rainfed area of Northeast China. Using 137Cs and 210Pbex to trace the impact of soil erosion on  soil organic carbon at a slope farmland in the  black soil region Optimized model of agro-animal husbandry for black soil region of Songnen Plain and its implementation effect Effects of leaf residue decomposition of cry1Ac-transgenic insect-resistant maize on community structure of soil animals An experimental study of Mollisol aggregate loss characteristics during rainfall erosion processes Effects of raindrop kinetic energy on splash erosion in the typical black soil region of Northeast China Effect of combined fertilization techniques on nitrogen and phosphorns in soil in the black soil region Community structure of soybean plant growth-promoting rhizobacteriain the black soil region of Northeast China The impact of sheet and gully erosion on soil aggregate losses in the black soil region of Northeast China