Soil Nitrogen Mineralization

Periodically, sub-samples from a soil sampling campaign are reburied in porous bags. After about 21 days, they are recovered and analyzed for N content. This table represents change in soil nitrate (plus nitrite) and ammonium over the incubation period.

This datatable is part of the Soil Inorganic Nitrogen on the Main Cropping System Experiment dataset. Measurement of soil inorganic nitrogen began in 1989 for all treatments on the LTER Main Site and 1993 on the Successional and Forest sites. Ammonium and nitrate are analyzed twice monthly or monthly during the growing season on baseline soil samplings. Additional datasets from the Baseline Soil Samplings include soil moisture, total N and total C.

Note

Experiment: Main Cropping System Experiment (MCSE)
Data available from: January 1989 to January 2015
Dataset: KBS021
Datatable ID: KBS021-004.38
Core Areas Inorganic Nutrients,Disturbance
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Last Updated 2017-12-18
Variate Description Units
Year year in which the initial sample date occurs
Campaign effort with which the sample is associated
Treatment treatment
Description Treatment description
Replicate replicate block
T0 Date date on which the soil sample was initially analyzed
T21 Date date on which the buried sample was retrieved
NetNitrification difference in nitrate levels (final minus the initial nitrate), divided by duration of the incubation. A positive sign means that there is more nitrate at the end of the incubation than at the beginning. micrograms/gram/day
NetMineralization difference in nitrate + ammonium levels (final - initial nitrate + ammonium), divided by duration of the incubation. A positive sign means that there is more nitrogen at the end of the incubation than the beginning. micrograms/gram/day
NetAmmonification the difference in ammonium levels (final - initial) devided by the duration of the incubation. A positive value means that there was more ammonium at the end of the incubation than at the beginning. micrograms/gram/day

Data Excerpt

year campaign treatment description replicate t0_date t21_date netnitrification netmineralization netammonification
1995 N Mineralization TSF Mid-successional R1 1995-08-21 0.28 0.10 -0.18
1995 N Mineralization T2 No-till Management R3 1995-05-30 0.15 0.27 0.12
1995 N Mineralization T2 No-till Management R1 1995-05-30 0.21 0.09 -0.12
1995 N Mineralization T2 No-till Management R3 1995-10-23 0.11 0.07 -0.04
1995 N Mineralization T3 Reduced Input Management R1 1995-10-23 0.09 0.05 -0.04
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