Mean soil carbon properties ± SE (n = 3) in 10-cm increments from 0 to 100 cm

Range Table - link
Organism Biosphere
Reference Hicks Pries CE, Castanha C, Porras RC, Torn MS. The whole-soil carbon flux in response to warming. Science. 2017 Mar 31355(6332):1420-1423. doi: 10.1126/science.aal1319. P.1421 table 1PubMed ID28280251
Method P.1420 right column 2nd paragraph: "[Investigators] warmed soils 4° ± 0.75°C from 10 cm down to 100 cm in the soil profile in three pairs of control and heated plots from November 2013 through February 2016 (Fig. 1 and figs. S1 and S2). [They] used 22 heating rods, each 2.4 m deep, arranged around plots 3 m in diameter (ref 17) with two additional circular heating cables buried 5 cm below the soil surface at radii of 0.5 and 1 m from the plot center. This method imposed 4°C warming while preserving the natural depth gradient and temporal variations in soil temperature. At 5 cm, because of the lack of aboveground heating, the heated plots were on average only 2.4° ± 1.2°C warmer than the control. Soil moisture was slightly decreased in the warmed plots by an average of 1.5 to 3.5% volumetric water content (fig. S3). The soil respiration response, which included microbial and root respiration (but see supplementary text), was determined monthly from seven replicate surface flux measurements per plot and by measuring gas well CO2 concentrations at five depths (15, 30, 50, 70, and 90 cm), from which depth-resolved CO2 production estimates were modeled using Fick’s law."
Comments P.1421 right column 2nd paragraph: "About 50% of soil respiration and 40% of the warming response occurred below 15 cm in the soil profile, where 63% of the SOC [soil organic carbon] stock (to 1 m) resides about 20% of soil respiration and 10% of the warming response occurred below 30 cm, where 32% of the SOC stock resides (Table 1)." P.1422 left column top paragraph: "Light-fraction SOC was modern throughout the soil profile, unlike bulk and dense-fraction, mineral-associated SOC, which became significantly more depleted with depth (depth × fraction interaction, P = 0.02, Fig. 3B). A similar proportion of SOC was in the light fraction at depths of 5 to 15 cm, 40 to 50 cm, and 90 to 100 cm (depth effect, P = 0.62, Table 1)."
Entered by Uri M
ID 113327