Soil, climatic, physiographic and stand data in Pinus sylvestris and Pinus halepensis plantations in Spain

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 Pinus halepensis Mill. plantations and 35 plots belonging to the Sustainable Forest Management Research Institute (iuFOR; University of Valladolid and INIA) located in Pinus sylvestris L. plantations in Spain.

Parameters included in the dataset: 
Plot: plot identification in the SNFI and iuFOR networks.
Species: species present in each plot (1: Pinus sylvestris; 2: Pinus halepensis)
Slope: gradient in the plot in percentage.
Altitude: elevation of the plot in meters above the sea level
Latitude and Longitude: geographical coordinates of the plots in degrees
Density: number of trees per hectare in the plot
Dg: quadratic mean diameter in centimetersç
Hm: mean height in meters of the trees in the plot
H0; dominant height in meters of the trees in the plot
BA: basal area of the plot in square meters per hectare
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) 
SQ: the site quality class
Age: average age in years of the trees in the plot
AW: soil available water in percentage
CO: soil coarse particles in percentage
Porosity: soil porosity in percentage
CLAY: clay content in soil in percentage
SILTUS: silt content in soil following the USDA criteria in percentage
SILTIS: silt content in soil following the International criteria, in percentage
SANDUS: sand content in soil following the USDA criteria, in percentage
SANDIS: sand content in soil following the International criteria, in percentage
OHT: organic horizon thickness in the plot in centimeters
([C/N]L):  the total carbon to total nitrogen ratio in the litter fraction of the organic horizon
([C/N]FH):  the total carbon to total nitrogen ratio in the fragmented plus humified fractions of the organic horizon 
L: amount of litter fraction in the organic horizon in tons per hectare
FH: amount of fragmented plus humified fraction in the organic horizon in tons per hectare. 
pH: soil pH value 
CEC: cation exchange capacity in soil in centimoles of charge per kilogram of soil (Bascomb, 1964)
EOC: amount of easily oxidizable C in soil in percentage (Walkley and Black, 1934)
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)
TN: total N in soil in percentage
TOC/TN: total organic C to total N ratio in soil
Ca, Mg, Na, K: exchangeable calcium, magnesium, sodium and potassium in soil in centimoles of charge per kilogram of soil (Schollenberger and Simon, 1945)
WSP: water soluble phenols in soil in micrograms of TAE per gram of soil (Box, 1983)
Carbonates: amount of carbonates in soil in percentage (Bundy and Bremner, 1972)
React_carb: amount of reactive carbonates in soil in percentage (Bashour and Sayegh, 2007)
Gypsum: amount of gypsum in soil in centimoles of charge per kilogram of soil (Richards, 1954)
Cu, Fe, Mn, Zn: amount of copper, iron, manganese and zinc in miligrams per kilogram of soil (Lindsay and Norvell, 1978)
EA: soil exchangeable acidity in centimoles of charge per kilogram of soil (Bascomb, 1964)
 Sat: base saturation of soil in percentage 
AlA, FeA, MnA: amorphous aluminum, iron and manganese (AlA, FeA, MnA) in soil in centimoles of charge per kilogram of soil (Bascomb, 1968)
AlM, FeM, MnM: organically bound aluminum, iron and manganese in soil in centimoles of charge per kilogram of soil (Blakemore et al. 1987) 
AlE: exchangeable aluminum in soil in centimoles of charge per kilogram of soil (Bertsch & Bloom, 1996)
AlI: inorganic aluminum in soil in centimoles of charge per kilogram of soil (Mc-Keague et al., 1971)
Cmic, Nmic, Pmic: amount of microbial biomass carbon, nitrogen and phosphorus in soil in milligrams per kilogram of soil (Vance et al. 1987)
Cmin: amount of mineralizable carbon in soil in milligrams per kilogram of soil (Isermeyer, 1952)
Cmin/TOC: mineralizable carbon to total organic carbon ratio 
Cmic/TOC: microbial biomass carbon to total organic carbon ratio
qCO2: microbial metabolic quotient (Cmin/Cmic) in soil in grams per week and gram of soil
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)
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)
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)
Urease: urease activity in soil (Hofmann, 1963) in milliunits per gram of dry soil (nanomoles of N per gram of soil and minute)
Catalase: catalase activity (Tabatabai and Beck, 1971) in milliunits per gram of dry soil (nanomoles of O₂ produced per gram of soil and minute)
MAT: mean annual temperature in degrees centigrade  (Ninyerola et al., 2005)
MMWM: mean maximum temperature of the warmest month in degrees centigrade (Ninyerola et al., 2005)
MMCM: mean maximum temperature of the coldest month in degrees centigrade  (Ninyerola et al., 2005)
MTWM: mean temperature of the warmest month in degrees centigrade (Ninyerola et al., 2005)
MTCM: mean temperature of the coldest month in degrees centigrade  (Ninyerola et al., 2005)
TP: total precipitation in millimeters  (Ninyerola et al., 2005)
PW, PSP, PSU, PA: winter, spring, summer and autumn precipitation in millimeters (Ninyerola et al., 2005)
PET, RET: potential and real evapotranspiration in millimetres (Thornthwaite, 1949 and Thorntwaite and Mather, 1955) 
Deficit: mean annual hydric deficit in millimeters (Thornthwaite, 1949 and Thorntwaite and Mather, 1955) 
Surplus: mean annual hydric surplus in millimetres (Thornthwaite, 1949 and Thorntwaite and Mather, 1955) 
AHI: Annual Hydric Index (Thornthwaite, 1949)
Martonne: Martonne index (De-Martonne, 1926)
Lang: Lang index  (Lang, 1919)

Code -999.99 indicates missing values.