Attribute_Name	ORDER	Storage_Type	Measurement_Scale	Number_Type	UNITS	DESCRIPTION	CODES
year	1	a	date-time	n/a	nominalYear	year	YYYY
doy	2	a	date-time	n/a	nominalDay	day of year	n/a
CO2trt	3	a	nominal	n/a	dimensionless	See reference: plots were covered with open-top-chambers and injected with either elevated or ambient CO2 air, for five years	a=ambient CO2 open-top-chamber; h=elevated (720ppm) CO2 OTC; c=nonchambered control
rep	4	a	nominal	n/a	dimensionless	field block	1,2,3
species	5	a	nominal	n/a	dimensionless	first two letters of genus and species name	example:vuoc=Vulpia octoflora
group	6	a	nominal	n/a	dimensionless	functional group	C3gram=C3graminoid; C4gram=C4graminoid; forb=broad leaved species
percent cover	7	i	ratio	real	number	visual estimate of percent cover	n/a
