Figure 1 | Scientific Reports

Figure 1

From: Nitrogen Fertilization Elevated Spatial Heterogeneity of Soil Microbial Biomass Carbon and Nitrogen in Switchgrass and Gamagrass Croplands

Figure 1

Illustration of a clustered random sampling design within a plot in the three-year long fertilization experimental site at the Tennessee State University (TSU) Agricultural Research Center in Nashville, TN, USA. Filled circles represent centroids (n = 8) and each plot consists of eight centroids with one in each sampling region (1.375 × 1.375 m). Xs represent sample locations determined from random directions and distances from a centroid. The extent of an interpolation map was thus determined by the minimum and maximum values at horizontal and vertical axes, and each map can attain its extent less than or equivalent to the study area (2.75 × 5.5 m rectangle).

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