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Study on Species Diversity during the Succession of Plant Communities on Abandoned Farmlands in Guancen Mountains,Shanxi Influence of autumn irrigation on soil N leaching loss of different farmlands in Hetao irrigation district, China Accumulation of copper and zinc in soils under different agricultural and natural field Suggestions Concerning the Return of Farmland to Forest and Grasseland in Development of China‘s Western Regions Fine Root and Grass Root Decomposition in an Intercropping System of Triploid Populus tomentosa and Lolium multiflorum Established on Land Converting from Farmland