The influence of poplar-crop intercropping on crop nutrient compositions THE STUDY ON SHADING EFFECT UNDER POPLAR-CROP INTERCROPPING SYSTEM Relationship between Crop Productivity and Ecological Factors in Poplar-Crop Intercropping Systems in Haihe Lowland Area A STUDY ON LIGHT UTILIZATION OF POPLAR-CROP INTERCROPPING SYSTEM Amount, composition and seasonal dynamics of litterfall in Poplar-Crop agroforestry ecosystems in Henan Eastern Plain Biomass Production and Carbon Sequestration in Poplar-Crop Agroforestry Ecosystems in Eastern Henan Plain Carbon storage of poplar-crop ecosystem in Eastern Henan Plain. The effect of poplar-crop intercropping space on wheat growth and yield STUDY ON POPLAR GROWTH UNDER AGRO-SILVICULTURAL INTERCROPPING CONDITIONS The shading and its effect on crop yield under poplar-crop intercropping system A study on microclimate under poplar-crop intercropping systems