KBS019:Annual Net Primary Production on the Main Cropping System Experiment

Aboveground annual net primary production (ANPP) has been measured on the LTER main site since 1990 and on the successional and forested sites since 1993. ANPP is measured at peak biomass for a given treatment. In some systems with multiple harvests or complex communities that have peaks occurring at different times of the year, measurements are taken at multiple times per year. Additional ANPP measurements are made where appropriate using leaf litter traps, estimates of diameter from tree basal diameter and for the poplar treatment occasional destructive harvests. See the ANPP protocol for descriptions of the sampling and measurement methods for each of the treatments.

Tables

KBS019-000 Standardized codes for identifying plant species
Researchers on various projects record identities of plant species as short semi-descriptive sequences of letters, which are interpreted for end-users by means of an authoritative list.
KBS019-003 Annual Crops and Alfalfa Biomass
Biomass clipped at ground level for LTER Main Site treatments 1-4 and 6. Weeds encountered during the crop harvest are reported in https://lter.kbs.msu.edu/datatables/40
KBS019-004 Non-crop (Weed) Biomass
Productivity data for plants other than target crops. The harvest campaign is an annual biomass harvest, but in T6 there are multiple harvests because the alfalfa is harvested multiple times during the year. In 1998, plants were only sorted to functional group rather than species. "Standing Dead" (standing dead plants of indeterminate species) was first sampled in 1997. The standing dead designation is for plants that grew this year but had senesced and were unidentifiable at harvest. From 1999 to 2011 this category may also include plant scraps that were unidentified after the plants were sorted to species in the field lab. The category "Surface Litter" was first sampled in 1998, and may or may not be desired in summaries. In 1990, 1992, 1994, 1995 and 1996 multiple harvests were done to capture species that were not present during the normal harvest period. These data are in the "Temporal Harvest":/datatables/290 table, but the August harvest from those campaigns is included in this table.
KBS019-005 Cover Crop Biomass
Productivity data for cover crops in LTER main site treatments. In wheat years the cover crop is planted in the spring and then tilled in the next spring, and the cover crop is measured before tillage. So the wheat years tend not to have a cover crop harvest. Weeds encountered during the cover crop harvest are reported in https://lter.kbs.msu.edu/datatables/40
KBS019-010 Scope of Non-crop Biomass

Summary of sampling effort represented in the Non-crop Biomass table, by Treatment, Replicate, Station, etc.

KBS019-014 Non-Crop (Weed) Species Diversity Index
Average species diversity as computed by the Shannon-Weaver H index based on the biomass of each species compared to the total biomass per station. This dataset is based on "Non Crop Biomass":http://lter.kbs.msu.edu/datatables/40.
KBS019-016 Annual Crops Population Estimates
The number of crop plants are counted in a one square meter quadrant.
KBS019-018 Temporal Harvest
Multiple harvests where done in 1990, 1992, 1994, 1995 and 1996, to characterize communities with more complex biomass distributions This table contains to biomass measured during these harvests |_. Year |_. Number of Harvests|_. Comment| |1990 |=. 2 | | |1992 |=. 2 | | |1994|=. 4 | on T7 only | |1995|=. 2| | |1996|=. 2 | |
KBS019-019 Top Non-crop species by Biomass
This datatable is derived from KBS019-004 it includes the average species proportion and the treatment species proportion. The treatment species proportion is calculated by diving the total biomass of the species for the whole treatment by the total biomass for that treatment. This table excludes standing dead biomass (which is part of the current year's biomass) and surface litter (which may not be part of the current year's biomas).
KBS019-021 Biomass Compilation for Herbaceous Systems
This is a combination of the "crop biomass":/datatables/39, "cover crop":/datatables/41 and "non-crop biomass":/datatables/40 tables to provide a consolidated view of the annual biomass production in the herbaceous cropping systems. For data from the non-crop biomass harvest the category "Surface Litter" has been removed for this table. The category 'Standing Dead' is included. “Standing Dead” (standing dead plants of indeterminate species) was first sampled in 1997. The standing dead designation is for plants that grew this year but had senesced and were unidentifiable at harvest. From 1999 to 2011 this category may also include plant scraps that were unidentified after the plants were sorted to species in the field lab.
KBS019-023 Post Frost Biomass
Successional fields are model ecosystems representing conversion of agricultural fields back to the natural vegetation. Successional systems have a potential to be used for cellulosic biofuels feedstock production. Use of successional systems for cellulosic biomass production requires measurements of harvestable biomass availability from these fields. We initiated such measurements by comparing biomass productivity at peak green biomass and post frost biomass, as measure of maximum and minimum harvestable biomass availability. Post frost biomass samples are taken after the air temperature as dipped below -2.2 C or 28 F at least once. The pre frost biomass was derived from the "non crop biomass":http://lter.kbs.msu.edu/datatables/40 by combining all of the species except 'surface litter' into the "UnSorted" category and summing the station biomass by species and then averaging over the stations to obtain a pre frost biomass estimate.
KBS019-024 Biomass data from Hess et al. 2020
Biomass data from Hess et al. 2020

Protocols

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