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Table 1 Pearson correlation coefficients between climate factors and soil properties with REE concentrations (μg g−1) of bulk and geochemical fractions in topsoils (0–10 cm) along the transect. Locations of the sites (S01–S21) are plotted in Fig. 1

From: Rare earth element geochemistry in soils along arid and semiarid grasslands in northern China

 

AI

MAT

MAP

PET

pH

TOC

Clay

R Fe–Mn

TIC

Bulk

ns

ns

ns

ns

ns

ns

ns

ns

ns

Carbonate-bound

− 0.81**

0.83**

− 0.85**

0.86**

0.52*

− 0.58**

ns

ns

0.46*

Reducible

ns

0.48*

ns

0.46*

0.45*

ns

ns

ns

ns

Oxidizable

0.81**

− 0.71**

0.77**

− 0.68**

− 0.62**

0.89**

0.71**

0.57**

ns

Residue

ns

ns

ns

ns

ns

ns

ns

ns

ns

  1. AI aridity index (unitless), MAT mean annual temperature (mm), MAP mean annual precipitation (mm), PET potential evapotranspiration (mm), pH pH value (unitless), TOC total organic carbon concentration (mg g−1), Clay clay fraction (%), RFe–Mn the sum of reducible manganese concentration and iron concentration (μg g−1), TIC total inorganic carbon concentration (μg g−1). **P < 0.01; *P < 0.05, ns non-significant correlation at 95 and 99% CI