European fine root biomass, fine root production and fine root necromass information

Description of columns:author: Reference(s) country: Name of country species: Main tree species, dominant species is first mix: 2 indicate mixed stand proportions: for mixed stands the share of the species is given, in percent of basal area (if basal area is unavailable, stem number, volume or biomass is used) year_mean: year of measurement(s), mean year is given, if data covers several years year_range: range of measurements separated by hyphen, if data covers several years needlebroad: dominant species group 1 conifers, 2 broadleaved species dom_sp: dominant tree species 1 Picea abies, 2 Abies alba, 3 Larix decidua, 4 Pinus sylvestris, 5 Pinus nigra, 8 Pseudotsuga menziessii, 9 other conifers, 10 Fagus sylvatica, 11 Quercus sp., 12 Carpinus betulus, 13 Fraxinus excelsior, 14 Acer sp., 20 Betula sp., 21 Alnus incana, 22 Alnus glutinosa, 23 Tilia sp., 26 Populus sp., 31 other broadleaves latitude: latitude in decimal degrees in WGS84 of location of measurements, if not reported approximate location was taken from other references, maps, etc. longitude: longitude in decimal degrees in WGS84 of location of measurements, if not reported approximate location was taken from other references, maps, etc. elevation: elevation in m above sea level, as reported in references temp: average annual temperature, as reported in references precip: annual precipitation sum, as reported in references density: tree density in stem per hectare, if reported basalarea: basal area in square meter per hectare, if reported height: average tree height in meter, if reported diameter: average tree diameter, usually at breast height (1.3 m), if reported volume: stem volume in cubic meter per hectare, if reported age: average stand age in years, if reported leafbiom: reported foliage biomass in kilogram per hectare, if reported soiltype: soil type, as reported in references, if reported soilCN: reported carbon:nitrogen ratio in soil, if reported FRB: fine root biomass with diameter 0-2 mm in gram per square meter understoryFRB: if reported, fine root biomass of understory with diameter 0-2 mm in gram per square meter FRN: fine root necromass with diameter 0-2 mm in gram per square meter necro_bio_separate: 1 if biomass values certainly represent only living roots (clear separation between alive and dead roots mentioned in references) FRBmethod: method used for determining fine root biomass depth: reported sample depth in centimeter FRP: sum of fine root production of trees and understory with diameter 0-2 mm in gram per square meter per year FRPmethod: method used for determining fine root production, 1 sequential coring, 2 ingrowth bags/nets/meshes, 4 minirhizotron SCmethod: description of methodology used to calculate fine root production for sequential coring, if available, dm ... decision matrix or balance transfer, mm ... minimum maximum, cf ... compartment flow, scs ... sum of siginifcant changes, sca ... sum of all significant changes FRP_note: more detailed description of fine root production method fineroot_C: carbon fraction in fine roots in percent fineroot_CN: carbon:nitrogen ratio in fine roots comment: additional comments on data collection, site, methodology, etc.