Fig. 2: Divergent responses of biomass and soil organic carbon densities to forestation (Δ(biomass density) and ΔSOCD) along climate and soil nitrogen gradients.
From: Asymmetry of carbon sequestrations by plant and soil after forestation regulated by soil nitrogen
a–d The distribution of Δ(biomass density), ΔSOCD, ΔTOCD (i.e., Δ(biomass density)+ΔSOCD), and ΔSOCD/Δ(biomass density) in a two-dimension space of mean annual temperature (MAT) and precipitation (MAP). e–h The distribution of Δ(biomass density), ΔSOCD, ΔTOCD, and ΔSOCD/Δ(biomass density) in a two-dimension space of soil total nitrogen density (STND) and stand age. The mean values for each interval, derived from the output of machine learning, are shown. The top line chart in (a) indicates the variation of Δ(biomass density) along the MAP gradient, while the chart on the right-hand side indicates the variation of Δ(biomass density) with MAT. Mean values for each interval were used to generate the lines. The line charts in (b–h) were created similarly.
