DOI: 10.5281/zenodo.15579255
title: Plant recruitment six years after the Samarco's tailings-dam disaster: Impacts on species richness and plant growth

description: Files and Variables

File: 1 Soil chemical analysis.xlsx

Description: Soil samples used for chemical and nutritional analysis. 

Variables



Independent variables (Column “Treatment“) are soils from affected and unaffected areas. With each repetition (9 samples per treatment)

Each column that folows are the soil parameters: soil pH in both H2O and KCl methods;  nutrients (P, K, Na, Ca2+, Mg2+); Al3+; potential acidity (H + Al); sum of bases (SB), effective Cation Exchange Capacity (t), potential Cation Exchange Capacity at pH 7.0 (T); base saturation (V%), Aluminum saturation (m%); Sodium Saturation Indices (ISNa%); Soil carbon content, or organic matter (MO); Remaining soil phosphorus content (P-rem); other elements (Cu, Mn, Fe, Zn, Cr, Ni, Cd, Pb);

Units of measurement: mg/dm3 (miligrams per cubic decimeter); cmolc/dm3 (charge per cubic decimeter); % (percentage); dag/kg (dekagram per kilogram); miligram per liter (mg/L);

Missing values: “-“ 


File: 2 Morphotypes list.xlsx

Description: Descriptive list of Morphotypes found in the soil seed bank experiment.

Variables



Columns: Morphotype code (number from 1 to 143, given to each morphotype at the moment of the experiment – after the after expert analysis some of these were After expert analysis, some individuals were considered to be of the same species and the final number is 116); Species/morphotype name (identification of each morphotype); Family (botanical Family).

Morfotipo (unidentified species, or only morphotype); NI (unidentified)


File: 2 Plant Recruitment.xlsx

Description:  Morphotypes found in each sample point. First sheet “sample per month”: data for each month; second sheet “total per sample”: data for the whole period summed.

Variables



Columns: “Region” (1Fundao, 2Paracatu, 3Candonga, see Fig1 and Materials & Methods section for coordinates); “Repetition” (five samples per region); “Season” (period of sampling - Wet or Dry); Month (from second to sixth month after the begining of experimente); “Treatment” (Affected or Unaffected); each following number is the plant morphotype code, according to “File: 2 Morphotypes list.xlsx”.


File: 3 Plant Growth - Dry biomass.xlsx

Description: Plant growth experiment data for dry biomass. Columns: Species “Ludwigia” and “Marsypianthes” for respectively Ludwigia octovalvis (Jacq.) P.H.Raven (Onagraceae) and Marsypianthes chamaedrys (Vahl) Kuntze (Lamiaceae); Organ, for plant part used in the analysis (root, stem, and leaves). Repetition (from 1 to 5)

Variables



Independent Variables: Treatment (Affected or Unaffected, respectively A and N).

Dependent Variable: Dry mass (in grams)

NA for not available


 

File: 3 Plant Growth - height and diameter.xlsx

Description: Plant growth experiment data for Height and diameter at ground level after 75 days of experiment. Columns: Species “Ludwigia” and “Marsypianthes” for respectively Ludwigia octovalvis (Jacq.) P.H.Raven (Onagraceae) and Marsypianthes chamaedrys (Vahl) Kuntze (Lamiaceae); Parameter measured monthly; treatment; Repetition; each following column is a measurement taken after 15 days.

Variables



Independent Variables: Treatment (Affected or Unaffected, respectively A and N).

Dependent Variable: Height (in centimeters) and Diameter (in millimeters)

NA for not available