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Root Biomass and Total Carbon and Nitrogen of Annual Crops — GLBRC Biofuel Cropping System Experiment

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Biomass and total carbon and nitrogen content of roots of BCSE annual crops (G1-G4) at physiological maturity. At KBS, the roots of a single plant are collected at each sampling station; at Arlington, all roots within one square meter are collected. In this datatable, KBS root biomass data are averaged across sampling stations (by replicate block) because biomass samples are composited by replicate for total carbon and nitrogen analysis; root biomass by station can be found in datatable/451. Arlington root data are given by station in this table because each station sample is analyzed for total carbon and nitrogen.

This datatable is part of the Roots of the Biofuel Cropping System Experiment dataset.

Different sampling methods are used to measure root production in the diverse cropping systems of the GLBRC Biofuel Cropping System Experiment (BCSE). For annual crop treatments (G1-G4), root biomass is sampled by excavating a single plant (KBS) or a known soil area (Arlington). For perennial crop treatments (G5-G10), root biomass is sampled from ~1 m deep cores and fine root production is estimated from ingrowth cores buried at the beginning of the growing season. In general, root sampling occurs around three sampling stations (S1-S3) in each replicate block (R1-R5) and at peak biomass, which means physiological maturity for annuals and pre-senescence for perennials. Roots may be analyzed for total carbon and nitrogen content.

Note

Experiment: GLBRC Biofuel Cropping System Experiment
Dataset: GLBRC089
Datatable ID: GLBRC089-001.79
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Last Updated 2023-10-24
Variate Description Units
year year of the growing season
sample date sample date
site location of biomass collection
treatment experimental treatment
replicate replicate nested in treatment
station sampling location
wi plot id Arlington Wisconsin plot code
species crop where roots were collected
bnpp g m2 Below ground root biomass. KBS root biomass is averaged by replicate. Arlington is given by station. g/m2
percent carbon percent total carbon in roots %
percent nitrogen percent total nitrogen in roots %
c g m2 Percent total carbon X root biomass in g/m2. KBS biomass is averaged by replicate; Arlington has CN data and biomass for each station.
n g m2 Percent total nitrogen X root biomass in g/m2. KBS biomass is averaged by replicate; Arlington has CN data and biomass for each station.
comments sample notes

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Data Excerpt

year sample_date site treatment replicate station wi_plot_id species bnpp_g_m2 percent_carbon percent_nitrogen c_g_m2 n_g_m2 comments
2017.0 2017-11-06 KBS GLBRC Intensive Site G1 R2 all stations Zea mays L. (*) 129.8868 samples were combined before grinding for CN analysis
2017.0 2017-11-07 KBS GLBRC Intensive Site G1 R3 all stations Zea mays L. (*) 126.3503 samples were combined before grinding for CN analysis
2017.0 2017-11-09 KBS GLBRC Intensive Site G1 R4 all stations Zea mays L. (*) 228.7257 samples were combined before grinding for CN analysis
2017.0 2017-11-06 KBS GLBRC Intensive Site G2 R2 all stations Zea mays L. (*) 295.7819 samples were combined before grinding for CN analysis
2017.0 2017-11-07 KBS GLBRC Intensive Site G2 R3 all stations Zea mays L. (*) 267.7194 samples were combined before grinding for CN analysis
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