Fig. 2: The differences of SOC and SIC responses to irrigation across natural conditions and management practices at the 0–30 cm soil depth (relative to the average of unirrigated cropland points) were shown.
From: Global soil organic and inorganic carbon vulnerability in response to irrigation
Environmental factors are on the left side of each panel. The solid triangles and circles with error lines indicate the average changes in SOC and SIC, respectively, and their respective 95% CIs. When the 95% CIs did not overlap with 0% (indicated by the vertical gray line), significant changes in SOC and SIC occurred over time. The number to the right of each panel indicates the total number of observations used to calculate the average. All data points are cropland without land use change. Temperature and precipitation are multi-year averages. The soil classification system used for soil types is FAO-90 (Note: GLa(Andic Gleysols), ATf(Fimic Anthrosols), NTh(Haplic Nitisols), LVa(Albic Luvsiols), ALh(Haplic Alisols), CMe(Eutric Cambisols), ACp(Plinthic Acrisols), CMg(Gleyic Cambisols), and GYk(Calcic Gypsisols)). Crop types come from the Global High Precision Crop Spatial Distribution (SPAM2020), and crop types other than rice, wheat, and corn are treated as others. Data points may contain studies of different durations, where IWU refers to the average irrigation water use over the years.
