Characteristics analysis of micro-element contents in western Erdos soil and in Tetraena mongolica plant Effects of Supplemental Light on Biomass and Mineral Element Content of Seedlings From Nine Families in Picea crassifolia Effect of simulation N deposition on herbaceous vegetation community in the plantation and natural forests of Pinus tabulaeformis in the Taiyue Mountain Genetic Analysis of Rice Grain Mineral Elements Content and Correlation Analysis with Main Agronomic Characters