Baseline Spatial Variability Study - Nitrogen Mineralization

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Nitrogen pool and mineralization rates for an array of geo-referenced points prior to the start of the Main Cropping System Experiment.

This datatable is part of the Baseline Spatial Variability Study dataset. A spatial variability study conducted across the LTER Main Site area (45 ha) at KBS prior to dividing the site into 1-ha experimental plots. During the 1988 growing season a stratified unaligned sampling scheme was used to collect 400-600 geo-referenced samples across the site (uniformly planted to a single variety of soybeans) for:

  1. geomorphological characteristics (microtopography, soil horizon depths, bulk density, texture);
  2. soil chemical characteristics (pH, NO3, NH4, total C, total N, moisture, inorganic P, trace metals);
  3. soil biological characteristics (N mineralization potentials, microbial biomass C, microbial biomass N, fungal/bacterial ratios, nematodes and other soil invertebrates; seed bank size);
  4. plant weed species abundance, weed biomass at peak standing crop); and
  5. insect characteristics (major pest and predator species).

Most soil samples (0-15cm) were taken before crop emergence, plant phenology samples were taken throughout the growing season, biomass samples were taken at physiological maturity, and insect samples were taken continuously. Dried soil and plant samples are archived for potential future analysis.


Experiment: Main Cropping System Experiment (MCSE)
Data available from: January 1988
Dataset: KBS003
Datatable ID: KBS003-007.47
Core Areas Inorganic Nutrients,Disturbance
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Last Updated 2020-07-10
Variate Description Units
year year of the observation
easting easting of the sample location in UTM 16N meter
northing northing of the sample location in UTM 16N meter
ino3 nitrate-N pool in ug N/g soil μg/g
pno3 net nitrification potential in ug N/g soil/d micrograms/gram/day
imin mineral-N pool (NH4-N + NO3-N) in ug N/g soil μg/g
pmin net N mineralization potential in ug N/g soil/d micrograms/gram/day
ino3 m2 nitrate-N pool (areal basis) in g N/m2 g/m2
pno3 m2 net nitrification potential (areal basis) in g N/m2/d grams/squaremeter/day
imin m2 nitrate-N pool (areal basis) in g N/m2 g/m2
pmin m2 net mineralization potential (areal basis) in g N/m2/d grams/squaremeter/day

Data Excerpt

year easting northing ino3 pno3 imin pmin ino3_m2 pno3_m2 imin_m2 pmin_m2
1988 633981 4696121 3.8 0.42 6.94 0.4 0.86 0.095 1.56 0.09
1988 634280 4696128 7.1 0.41 9.45 0.4 1.58 0.091 2.1 0.089
1988 634081 4696127 7.22 0.52 12.97 0.4 1.42 0.102 2.55 0.079
1988 633913 4696126 9.72 0.7 15.18 0.61 1.55 0.111 2.41 0.097
1988 633914 4696128 4.64 0.53 7.3 0.54 0.75 0.086 1.18 0.087
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