Attribute_Name	ORDER	Storage_Type	Measurement_Scale	Number_Type	UNITS	DESCRIPTION	CODES
year	1	a	date-time	n/a	nominalYear	typical growing season from April to October	YYYY
co2trt	2	a	nominal	n/a	dimensionless	Treatment plots were covered with chamber pumped with elevated CO2 levels or pumped ambient air.  Control plots were not under a chanmber.	a=ambient CO2 open-top-chamber; h=elevated (720ppm) CO2 OTC; c=nonchambered control
rep	3	a	nominal	n/a	dimensionless	1 of 3 fields or BLOCKs within the chamber or control area	1,2,3
dw/m2	4	i	ratio	real	gramsPerSquareMeter	grams of dry plant material per meter squared of ground area	n/a
