Table 2. Contents and format of ndp073.dat (File 2)

Variable	Variable type	Variable width	Starting column	Ending column	Units	Spreadsheet column	Definition and comments
PAP_NO	Numeric	6	1	6		A	Cited paper number
PARAM	Character	7	7	13		B	Measured parameter
P_UNIT	Character	14	14	27		C	Unit for PARAM
GENUS	Character	13	28	40		D	Plant genus name
SPECIES	Character	13	41	53		E	Plant species name
DIV1	Character	6	54	59		F	Functional division #1
DIV2	Character	7	60	66		G	Functional division #2
DIV3	Character	5	67	71		H	Functional division #3
DIV4	Character	6	72	77		I	Functional division #4
AMB	Character	3	78	80	See CO2_UNIT	J	Ambient CO₂ treatment level
ELEV	Character	4	81	84	See CO2_UNIT	K	Elevated CO₂ treatment level
CO2_UNIT	Character	10	85	94	See text following table	L	Units for CO₂ exposure concentration
TIME	Character	5	95	99	Days	M	Maximum duration of CO₂ exposure
POT	Character	13	100	112		N	Growing method
MTHD	Character	4	113	116		O	CO₂-exposure facility
STOCK	Character	9	117	125		P	Planting stock
XTRT	Character	6	126	131		Q	Interacting treatment
LEVEL	Character	7	132	138		R	Interacting treatment level
QUANT	Character	17	139	155		S	Quantity and unit associated with LEVEL
SOURCE	Character	6	156	161		T	Figure, table, or page from which data taken
X_AMB	Numeric	8	162	169	See P_UNIT	U	Mean response of plants grown in ambient CO₂
SE_AMB	Numeric	8	170	177	See P_UNIT	V	Standard error of X_AMB
SD_AMB	Numeric	8	178	185	See P_UNIT	W	Standard deviation of responses of plants grown in ambient CO₂
CV*_AMB	Numeric	7	186	192	%	X	Coefficient of variation of responses of plants grown in ambient CO₂
N_AMB	Numeric	5	193	197		Y	Sample size of responses of plants grown in ambient CO₂
X_ELEV	Numeric	9	198	206	See P_UNIT	Z	Mean response of plants grown in elevated CO₂
SE_ELEV	Numeric	7	207	213	See P_UNIT	AA	Standard error of X_ELEV
SD_ELEV	Numeric	8	214	221	See P_UNIT	AB	Standard deviation of responses of plants grown in elevated CO₂
CV*_ELEV	Numeric	8	222	229	%	AC	Coefficient of variation of responses of plants grown in elevated CO₂
N_ELEV	Numeric	6	230	235		AD	Sample size of responses of plants grown in elevated CO₂
SDC	Character	3	236	238		AE	Calculated versus reported standard deviation

Where:

For PARAM, the following list defines the possible measured parameters:

plant parts

AGPROD: aboveground productivity (= AGWT + clippings)

AGWT: total aboveground weight

BGWT: total belowground weight

LFWT: total leaf weight

RGR: relative growth rate

ROOTWT: root weight

SHTWT: shoot weight

STWT: stem weight

TILLERS: number of tillers

TOTWT: whole plant weight

leaf area components

INDLA: maximum individual leaf area

MAXLA: maximum canopy leaf area

SLA: specific leaf area (leaf area/unit mass of leaf)

SLW: specific leaf weight (leaf mass/unit area of leaf)

gas-exchange parameters

GR: stomatal resistance of ambient-grown plants measured at ambient CO₂ levels (X_AMB) and of elevated-grown plants measured at elevated CO₂ levels (X_ELEV)

GR_AC: stomatal resistance of ambient-grown plants measured at elevated CO₂ levels (X_AMB) and of elevated-grown plants measured at elevated CO₂ levels (X_ELEV)

GS: stomatal conductance of ambient-grown plants measured under ambient CO₂ (X_AMB) and elevated-grown plants measured under elevated CO₂ levels (X_ELEV)

PN: net CO₂ assimilation of ambient-grown plants measured under ambient CO₂ (X_AMB) and elevated-grown plants measured under elevated CO₂ levels (X_ELEV)

PN_AC: net CO₂ assimilation of ambient-grown plants measured at elevated CO₂ (X_AMB) and elevated-grown plants measured at elevated CO₂ levels (X_ELEV)

RD: dark respiration of ambient-grown plants measured under ambient CO₂ (X_AMB) and elevated-grown plants measured under elevated CO₂ levels (X_ELEV)

WUE: water use efficiency of ambient-grown plants measured under ambient CO₂ (X_AMB) and elevated-grown plants measured under elevated CO₂ levels (X_ELEV)

WUE_AC: water use efficiency of ambient-grown plants measured at elevated CO₂ (X_AMB) and elevated-grown plants measured at elevated CO₂ levels (X_ELEV)

biochemical constituents

AGN: aboveground N

BGN: belowground N

LFN: leaf N

STEMN: stem total N

TOTN: total N

The value of PARAM is linked to that shown for P_UNIT (parameter units), X_AMB (parameter value for plants grown under ambient CO₂ exposure conditions), and X_ELEV (parameter value for plants grown under elevated CO₂ exposure conditions).

The only entry for DIV1 (functional division #1) is ANGIO (angiosperms)

Entries for DIV2 (functional division #2) are

GRASS

GRASS_C: typically monotypic crop; generally does not include pasture species

SEDGE

Entries for DIV3 (functional division #3), if known, are

C3/C4: C3/C4 intermediate, as reported by the authors of the cited paper

Entries for DIV4 (functional division #4) are general habitat or location:

ALPINE

BOREAL

GRASS (grassland)

MEAD (meadow)

WETL (wetland)

The values of AMB and ELEV are linked to those shown for CO2_UNIT.

Entries for CO2_UNIT are

Pa (Pascals)

ubar (1 ubar = 0.1 Pa)

ppm

ul/l

cm³/m³

umol/mol

umol/l

ml/l

TIME represents the maximum duration (days) of the CO₂ exposure.

For POT (growing method), a numeric entry signifies pot size (in liters) used during the major part of the experiment; the other entries are

GRND: plants rooted in the ground

HYDRO: solution or aeroponic culture

Entries for MTHD (CO₂-exposure facility) are

FACE: Free-Air CO₂ Enrichment

GC: indoor, controlled environment: growth chambers

GH: sunlit greenhouses and chambers within greenhouses; also includes closed-top chambers in the field, covering ecosystems

OTC: field-based open-top chambers

SACC: screen-aided CO₂ control

Entries for STOCK (planting stock codes) are

CLONE: experimental plants started from cuttings (graminoids); published paper refers to specific genotype

ECOSYS: entire ecosystem exposed

MATURE: mature plants exposed

MIXED: typically ecosystems where species are propagated from multiple sources

RAMETS: small plants (with 2 to 3 tillers) propagated from cuttings, rather than grown from seed

SEED: plants started from seeds

SEEDLINGS: young plants grown from seed

TILLERS: equivalent to rhizomes or stolons, depending upon species; that is, more-or-less horizontal stems or culms

Entries for XTRT (codes for interacting treatment, used together with CO₂) are

COMP: plant competition

DEFOL: defoliation (clipping by any means)

FERT: soil fertility

FLD: flooding treatment

F+O3: fertility plus ozone

H2O: well-watered versus drought

LIGHT: light treatment

NONE: no additional treatment beyond CO₂ enrichment; usually optimal growth conditions

O3: ozone exposure

SALT:

TEMP: temperature treatment

The entries for LEVEL (which qualitatively describes the treatment level) are treatment-dependent; this field is linked with XTRT (which characterizes the treatment type) and QUANT (which quantifies the treatment level).

For XTRT = COMP, FERT+L, NATIVE, NONE, or SALT, LEVEL = . (missing value) (see entry for corresponding paper in comments.dat and comments.wk1 files)

For soil fertility treatment:

CONTROL

LOW

MED

TRT-1

TRT-2

TRT-3

missing (.) when treatment cannot be clearly described (see entry for corresponding paper in comments.dat and comments.wk1 files).

For H2O treatment:

DRT: drought

FLD: flooding

PRECIP: natural levels of precipitation

WW: well-watered

For LIGHT, TEMP, OZONE, and UVB treatments:

CONTROL

LOW

Entries for QUANT, which quantify the interacting treatment level, are treatment-dependent. The combination of quantity and unit is reported in this one field (see also the corresponding entry in comments.dat and comments.wk1 file). If QUANT data are not available or inappropriate, a missing value (.) is present.

Possible entry formats for SOURCE (figure, table, or page from which data were extracted) are:

F1a (Fig. 1a)

T1 (Table 1)

Entries for X_AMB, SE_AMB, SD_AMB, X_ELEV, SE_ELEV, and SD_ELEV are linked to the units given for P_UNIT. The suffix "AMB" refers to measurements of plants grown under ambient CO₂ exposure conditions, and the suffix "ELEV" refers to measurements of plants grown under elevated CO₂ exposure conditions.

For CV*_AMB and CV*_ELEV, corrected (for small sample size) coefficient of variation was calculated according to Sokal and Rohlf (1981) as follows:

CV* = (1 + 1/4N)(SD x 100)/X

where SD = standard deviation, X = mean, and N = sample size.

SDC indicates whether the tabulated values for standard deviation (used to calculate coefficient of variation) were extracted directly from the cited publications or calculated from reported values for standard error. The tabulated values of SDC are either Y (yes) or N (no).