DOI: 10.5281/zenodo.1294607
title: Soil, climatic, physiographic and stand data in Pinus sylvestris and Pinus halepensis plantations in Spain

description: This dataset contains information about soil physical, chemical and biochemical, climatic, physiographic and stand parameters of 32 plots belonging to the Spanish National Forest Inventory (SNFI) located in <em>Pinus halepensis</em> Mill. plantations and 35 plots belonging to the Sustainable Forest Management Research Institute (iuFOR; University of Valladolid and INIA) located in <em>Pinus sylvestris </em>L. plantations in Spain.

Parameters included in the dataset: <br>
Plot: plot identification in the SNFI and iuFOR networks.<br>
Species: species present in each plot (1: Pinus sylvestris; 2: Pinus halepensis)<br>
Slope: gradient in the plot in percentage.<br>
Altitude: elevation of the plot in meters above the sea level<br>
Latitude and Longitude: geographical coordinates of the plots in degrees<br>
Density: number of trees per hectare in the plot<br>
Dg: quadratic mean diameter in centimetersç<br>
Hm: mean height in meters of the trees in the plot<br>
H0; dominant height in meters of the trees in the plot<br>
BA: basal area of the plot in square meters per hectare<br>
SI: site index; dominant height of the trees in the plot at the reference age (80 years for Pinus halepensis and 50 years for Pinus sylvestris stands) <br>
SQ: the site quality class<br>
Age: average age in years of the trees in the plot<br>
AW: soil available water in percentage<br>
CO: soil coarse particles in percentage<br>
Porosity: soil porosity in percentage<br>
CLAY: clay content in soil in percentage<br>
SILTUS: silt content in soil following the USDA criteria in percentage<br>
SILTIS: silt content in soil following the International criteria, in percentage<br>
SANDUS: sand content in soil following the USDA criteria, in percentage<br>
SANDIS: sand content in soil following the International criteria, in percentage<br>
OHT: organic horizon thickness in the plot in centimeters<br>
([C/N]L):  the total carbon to total nitrogen ratio in the litter fraction of the organic horizon<br>
([C/N]FH):  the total carbon to total nitrogen ratio in the fragmented plus humified fractions of the organic horizon <br>
L: amount of litter fraction in the organic horizon in tons per hectare<br>
FH: amount of fragmented plus humified fraction in the organic horizon in tons per hectare. <br>
pH: soil pH value <br>
CEC: cation exchange capacity in soil in centimoles of charge per kilogram of soil (Bascomb, 1964)<br>
EOC: amount of easily oxidizable C in soil in percentage (Walkley and Black, 1934)<br>
AP: amount of available phosphorus in soil in miligrams per kilogram of soil extracted with anion exchange membranes and determined with colorimetry (Murphy and Riley, 1962)<br>
TN: total N in soil in percentage<br>
TOC/TN: total organic C to total N ratio in soil<br>
Ca, Mg, Na, K: exchangeable calcium, magnesium, sodium and potassium in soil in centimoles of charge per kilogram of soil (Schollenberger and Simon, 1945)<br>
WSP: water soluble phenols in soil in micrograms of TAE per gram of soil (Box, 1983)<br>
Carbonates: amount of carbonates in soil in percentage (Bundy and Bremner, 1972)<br>
React_carb: amount of reactive carbonates in soil in percentage (Bashour and Sayegh, 2007)<br>
Gypsum: amount of gypsum in soil in centimoles of charge per kilogram of soil (Richards, 1954)<br>
Cu, Fe, Mn, Zn: amount of copper, iron, manganese and zinc in miligrams per kilogram of soil (Lindsay and Norvell, 1978)<br>
EA: soil exchangeable acidity in centimoles of charge per kilogram of soil (Bascomb, 1964)<br>
 Sat: base saturation of soil in percentage <br>
AlA, FeA, MnA: amorphous aluminum, iron and manganese (AlA, FeA, MnA) in soil in centimoles of charge per kilogram of soil (Bascomb, 1968)<br>
AlM, FeM, MnM: organically bound aluminum, iron and manganese in soil in centimoles of charge per kilogram of soil (Blakemore et al. 1987) <br>
AlE: exchangeable aluminum in soil in centimoles of charge per kilogram of soil (Bertsch & Bloom, 1996)<br>
AlI: inorganic aluminum in soil in centimoles of charge per kilogram of soil (Mc-Keague et al., 1971)<br>
Cmic, Nmic, Pmic: amount of microbial biomass carbon, nitrogen and phosphorus in soil in milligrams per kilogram of soil (Vance et al. 1987)<br>
Cmin: amount of mineralizable carbon in soil in milligrams per kilogram of soil (Isermeyer, 1952)<br>
Cmin/TOC: mineralizable carbon to total organic carbon ratio <br>
Cmic/TOC: microbial biomass carbon to total organic carbon ratio<br>
qCO2: microbial metabolic quotient (Cmin/Cmic) in soil in grams per week and gram of soil<br>
FDA: fluorescein diacetate hydrolysis reaction (Alef and Nannipieri, 1995) in milliunits per gram of dry soil (nanomoles of fluorescein diacetate produced per gram of soil and minute)<br>
DHA: dehydrogenase activity (Casida et al., 1964) in milliunits per gram of dry soil (nanomoles of triphenyl formazan produced per gram of soil and minute)<br>
AcPhos, AlkPhos: acid and alkaline phosphatase activity (Tabatabai and Bremner, 1969) in milliunits per gram of dry soil (nanomoles of p-nitrophenol produced per gram of soil and minute)<br>
Urease: urease activity in soil (Hofmann, 1963) in milliunits per gram of dry soil (nanomoles of N per gram of soil and minute)<br>
Catalase: catalase activity (Tabatabai and Beck, 1971) in milliunits per gram of dry soil (nanomoles of O<sub>2</sub> produced per gram of soil and minute)<br>
MAT: mean annual temperature in degrees centigrade  (Ninyerola et al., 2005)<br>
MMWM: mean maximum temperature of the warmest month in degrees centigrade (Ninyerola et al., 2005)<br>
MMCM: mean maximum temperature of the coldest month in degrees centigrade  (Ninyerola et al., 2005)<br>
MTWM: mean temperature of the warmest month in degrees centigrade (Ninyerola et al., 2005)<br>
MTCM: mean temperature of the coldest month in degrees centigrade  (Ninyerola et al., 2005)<br>
TP: total precipitation in millimeters  (Ninyerola et al., 2005)<br>
PW, PSP, PSU, PA: winter, spring, summer and autumn precipitation in millimeters (Ninyerola et al., 2005)<br>
PET, RET: potential and real evapotranspiration in millimetres (Thornthwaite, 1949 and Thorntwaite and Mather, 1955) <br>
Deficit: mean annual hydric deficit in millimeters (Thornthwaite, 1949 and Thorntwaite and Mather, 1955) <br>
Surplus: mean annual hydric surplus in millimetres (Thornthwaite, 1949 and Thorntwaite and Mather, 1955) <br>
AHI: Annual Hydric Index (Thornthwaite, 1949)<br>
Martonne: Martonne index (De-Martonne, 1926)<br>
Lang: Lang index  (Lang, 1919)

Code -999.99 indicates missing values.
description: When using this data, please cite the original publications that generated the dataset: 

Bueis T, Bravo F, Pando V, Turrión M B (2016) Relationship between environmental parameters and Pinus sylvestris L. site index in forest plantations in northern Spain acidic plateau. iForest, 9: 394-401. DOI: 10.3832/ifor1600-008

Bueis T, Bravo F, Pando V, Turrión M B (2017) Site factors as predictors for Pinus halepensis Mill. productivity in Spanish plantations. Annals of Forest Science, 74: 6. DOI: 10.1007/s13595-016-0609-7

Bueis T, Turrión M B, Bravo F, Pando V, Muscolo A (2018) Factors determining enzyme activities in soils under Pinus halepensis Mill. and Pinus sylvestris L. plantations in Spain: a contribution to sustainable forest management. Annals of Forest Science, 75: 34. DOI: 10.1007/s13595-018-0720-z
description: {"references": ["Bueis T, Bravo F, Pando V, Turri\u00f3n M B (2016) Relationship between environmental parameters and Pinus sylvestris L. site index in forest plantations in northern Spain acidic plateau. iForest, 9: 394-401. DOI: 10.3832/ifor1600-008", "Bueis T, Bravo F, Pando V, Turri\u00f3n M B (2017) Site factors as predictors for Pinus halepensis Mill. productivity in Spanish plantations. Annals of Forest Science, 74: 6. DOI: 10.1007/s13595-016-0609-7", "Bueis T, Turri\u00f3n M B, Bravo F, Pando V, Muscolo A (2018) Factors determining enzyme activities in soils under Pinus halepensis Mill. and Pinus sylvestris L. plantations in Spain: a contribution to sustainable forest management. Annals of Forest Science, 75: 34. DOI: 10.1007/s13595-018-0720-z"]}