stratified sampling 第1页

Carbon Density of Herbage in Natural Secondary Pinus tabulaeformis Forest in Huoditang Zone,Qinling Moutains Accuracy Improvement in Yield Estimation of Large-scale Grassland by Stratified Sampling—-A Case Study of Lowland Meadow Study on estimating reserves of wild Seutellaria baicalensis in Inner Mongolia region based on 3S technology