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A study on the plot minimum area and shape for sampling Trollius chinensis yield Characteristics of VOC Emission from Plywood in Different Environment Factors A meta-analysis of field experiment data for characterizing the topsoil organic carbon changes under different fertilization treatments in uplands of China Dynamics of farmland SOC in parallel ridge valley of east Sichuan during 1980-2011 Spatial-temporal evolution process and its evaluation characteristic of rocky desertification in Bijie experimental area