TITLE

	Forest Response to Stress and Damage  (FORSTAD) Lysimeter Data 1993-2000





PRINCIPAL INVESTIGATORS

	Gary Lovett

	Charles Canham

	Clive Jones

	Rick Ostfeld



BEGIN DATE

	1993



END DATE

	2000



LOCATION

	In the Cannoo Hills on the property of the Institute of Ecosystem Studies, on the Cary Arboretum, in Millbrook, New York.  (41( 47(N, 73( 44(W)  



LOCATION DESCRIPTION

Nutrient cycling sites are circular plots, 25.24 meters is diameter (area = 1/20 hectare).  Site A is in a sheltered location on Cannoo (Tea House) Hill, elevation 180 meters, and Site B is on the western slope of North Cannoo Hill, elevation 200 meters.  The canopy trees on each site are a mix of oak, maple, and pine.  Nutrient cycling sites were established in 1992; ten lysimeters were installed on each site at this time.  Each lysimeter is each paired with a throughfall collector, which are randomly distributed in the plots.  



ACCESS

	Public



DATA LOCATION

	Institute of Ecosystem Studies, Millbrook, New York



LAST UPDATED

	June, 2001



CONTACT PERSON

	Gary Lovett

	Institute of Ecosystem Studies

	PO Box AB

	Millbrook, NY 12545

	Telephone: (845) 677-5343



CODES

	Start Date = beginning of bulking period		 

	End Date = end of bulking period

	Period = approximate month of bulking period

	Site = site identification (AL or BL)

	pH = mean pH of samples

	H = mean concentration of hydrogen ion

	Ca = mean concentration of calcium ion 

	Mg = mean concentration of magnesium ion 

	K = mean concentration of potassium ion  

	Na = mean concentration of sodium ion  

	NH4 = mean concentration of ammonium ion

	NO3 = mean concentration of nitrate ion 

	SO4 = mean concentration of sulfate ion 

	Cl = mean concentration of chloride ion 

	nd = no data available



DATA DESCRIPTION

	The data presented here are ion concentrations in mg/L, averaged by site and by month.  Concentrations of ammonium, nitrate, and sulfate are expressed as concentrations of the ion, not the element (N or S).  All data are site-wide monthly means.



SAMPLING DESIGN

	There are ten lysimeters on each of the two sites, installed in the B horizon.  Sampling was conducted consistently from April 1992 - December 2000.

	Lysimeters are connected to a constant tension, hanging column siphon system, which pulls a constant, low-level vacuum.  Soil solution is drawn through the porous ceramic cup at the base of the lysimeter into the collection tube.  As solution is pulled through the ceramic collector, particulates are filtered out and so no post-collection filtration is necessary.

	During the months when lysimeters reliably collect soil solution (October-May), lysimeters are collected weekly.  During the summer months, very little soil solution is collected.

	The sample is bulked monthly by collector and submitted to the IES Analytical Lab for ion analysis.



NOTES

	Data is presented for those months in which the lysimeters collected soil solution.  Except in very wet years, the lysimeters do not collect during the summer, between leaf-out in mid-May and leaf fall in October.  Even during the wetter months, lysimeter collection can be variable and not all lysimeters will collect in any given month.  In February of 1993, most of the lysimeters froze and could not be collected.  



Lysimeters were installed in 1992, but ion data from 1992 is deleted from this data set.  Soil disturbance caused by lysimeter installation results in changed levels of ions in soil solution; therefore a year of settling time is required before soil solution ion data can be accepted.



DATA