Table 1 Characterization of carbon and nitrogen contents of the gravel plain non-vegetated (NV) soil, speargrasses rhizosheath (RS) and rhizosphere (RH); values are expressed as mean of three replicates ± standard deviation.

From: The plant rhizosheath–root niche is an edaphic “mini-oasis” in hyperarid deserts with enhanced microbial competition

Variable

Unit

ANOVA (p)

NV

RH

RS

Organic matter

%

0.0008

0.066 ± 0.002 (a)

2.869 ± 0.723 (b)

0.140 ± 0.076 (a)

Total C

µg/mg

<0.0001

2.030 ± 0429 (a)

17.185 ± 2.962 (b)

2.199 ± 0.886 (a)

 POC

µg/mg

0.0008

0.332 ± 0.010 (a)

14.344 ± 3.616 (b)

0.698 ± 0.382 (a)

 PIC

µg/mg

0.0197

1.698 ± 0.421 (a)

2.842 ± 2.130 (b)

1.502 ± 0.622 (ab)

Total N

µg/mg

0.0021

0.038 ± 0.100 (a)

0.418 ± 0.100 (b)

0.056 ± 0.021 (a)

 PON

µg/mg

0.0074

0.043 ± 0.002 (a)

0.357 ± 0.099 (b)

0.056 ± 0.018 (a)

 PIN

µg/mg

<0.0001

0.005 ± 0.004 (a)

0.0611 ± 0.008 (b)

0.0006 ± 0.002 (a)

  1. Results of ANOVA tests are reported (p value); different letters indicate the significant difference across samples (Tukey’s multiple comparisons test, p < 0.05). The other physicochemical parameters measured are listed in Supplementary Table S4.
  2. POC particulate organic carbon, PIC particulate inorganic carbon, PON particulate organic nitrogen, PIN particulate inorganic nitrogen, NV non vegetated, RH rhizosphere, RS rhizosheath.
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