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Project: NPP Soil Water Content

Project ID: 210013000
Funding Source: LTER II, LTER III, LTER IV, LTER V
Abstract:

Once a month soil water content measurements are made at 10 depths (where possible) at each of 10 access tubes at each of the 15 LTER-II NPP sites using a neutron probe (Campbell Model 503DR Hydroprobe). Measurements are taken at 30cm, 60cm, 90cm, 120cm, 150cm, 180cm, 210cm, 240cm, 270cm, and 300cm when possible or to the greatest depth it was possible to install the access tubing before hitting a layer of impenetrable caliche. Converted water content values are a volume/volume relationship and represent cm3 water/cm3 soil. Two files per month are maintained: Raw count data (mmddyy-2.RAW; example 121189-2.RAW where mmddyy=month day year of reading and "2" indicates data is LTER-II NPP site neutron probe readings) and calculated/sorted data maintained in a file for each year (NPPSWCyr.DAT; example NPPSWC89.DAT for 1989 NPP soil water content data).