WAT02 Climate legacies determine grassland responses to future rainfall regimes

Summary

Short name: 

WAT02

Abstract: 

Climate variability and periodic droughts have complex effects on carbon (C) fluxes, with uncertain implications for ecosystem C balance under a changing climate. Responses to climate change can be modulated by persistent effects of climate history on plant communities, soil microbial activity, and nutrient cycling (i.e., legacies). To assess how legacies of past precipitation regimes influence tallgrass prairie C cycling under new precipitation regimes, we modified a long-term irrigation experiment that simulated a wetter climate for >25 years. We reversed irrigated and control (ambient precipitation) treatments in some plots and imposed an experimental drought in plots with a history of irrigation or ambient precipitation to assess how climate legacies affect aboveground net primary productivity (ANPP), soil respiration, and selected soil C pools. Legacy effects of elevated precipitation (irrigation) included higher C fluxes and altered labile soil C pools, and in some cases altered sensitivity to new climate treatments. Indeed, decades of irrigation reduced the sensitivity of both ANPP and soil respiration to drought compared with controls. Positive legacy effects of irrigation on ANPP persisted for at least 3 years following treatment reversal, were apparent in both wet and dry years, and were associated with altered plant functional composition. In contrast, legacy effects on soil respiration were comparatively short-lived and did not manifest under natural or experimentally-imposed “wet years,” suggesting that legacy effects on CO2 efflux are contingent on current conditions. Although total soil C remained similar across treatments, long-term irrigation increased labile soil C and the sensitivity of microbial biomass C to drought. Importantly, the magnitude of legacy effects for all response variables varied with topography, suggesting that landscape can modulate the strength and direction of climate legacies. Our results demonstrate the role of climate history as an important determinant of terrestrial C cycling responses to future climate changes.

Published on EDI/LTER Data Portal

Citation Suggestion: 

Broderick, C., Wilkins, K., Smith, M. D., Blair, J. M. 2022. WAT02 Climate legacies determine grassland responses to future rainfall regimes . Environmental Data Initiative. http://dx.doi.org/10.6073/pasta/3867a182ca529326da74b77615098cdd.

Data set ID: 

157

EML revision ID: 

2

Data sources: 

Variables: 

DataCode
  • Label:
  • Definition: Dataset code
  • Type: Nominal
  • Missing values: None specified
RecType
  • Label:
  • Definition: Record type
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
RecYear
  • Label:
  • Definition: Year of record
  • Type: Physical quantity
  • Unit: Year (YYYY)
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Plot_2017
  • Label:
  • Definition: Plot designation in 2017, after irrigation lines were shifted
  • Type: Nominal
  • Missing values: None specified
REP
  • Label:
  • Definition: One of six 0.1 m2 subsamples of each plot
  • Type: Nominal
  • Missing values: None specified
Livegrass
  • Label:
  • Definition: Biomass in grams of live grass in 0.1 m2 sample.
  • Type: Physical quantity
  • Unit: gramsPerSquareMeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NA = Missing or Not Measured
Forbs
  • Label:
  • Definition: Biomass in grams of forbs in 0.1 m2 sample.
  • Type: Physical quantity
  • Unit: gramsPerSquareMeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Woody
  • Label:
  • Definition: Biomass in grams of woody plants in 0.1 m2 sample.
  • Type: Physical quantity
  • Unit: gramsPerSquareMeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Current
  • Label:
  • Definition: Treatment in 2017, after irrigation lines were shifted.
  • Type: Nominal
  • Missing values: None specified
Replicate
  • Label:
  • Definition: Irrigation line: (A) started in 1991, (B) started in 1993.
  • Type: Nominal
  • Missing values: None specified
Replicate_ed
  • Label:
  • Definition: Irrigation lines as in "Replicate", but divided into uplands and lowlands to yield spatial "blocks".
  • Type: Nominal
  • Missing values: None specified
Transect_1993
  • Label:
  • Definition: Previous treatment (1991-2016).
  • Type: Nominal
  • Missing values: None specified
Plot_1993
  • Label:
  • Definition: Plot designation 1991-2017, before irrigation lines were shifted. Plots that are currently in the reduced (R) treatment did not have plot numbers during this time
  • Type: Nominal
  • Missing values: None specified
Plot_1992
  • Label:
  • Definition: Plot designations in 1992, while second irrigation line was being added. These plot designations are not typically used.
  • Type: Nominal
  • Missing values: None specified

Variables: 

DataCode
  • Label:
  • Definition: Dataset code
  • Type: Nominal
  • Missing values: None specified
RecType
  • Label:
  • Definition: Record type
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
RecYear
  • Label:
  • Definition: Year of record
  • Type: Physical quantity
  • Unit: Year (YYYY)
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
RecMonth
  • Label:
  • Definition: Month of record
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
RecDay
  • Label:
  • Definition: Day of record
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
doy
  • Label:
  • Definition: Day of year
  • Type: Physical quantity
  • Unit: number
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Plot_2017
  • Label:
  • Definition: Plot designation in 2017, after irrigation lines were shifted
  • Type: Nominal
  • Missing values: None specified
gwc
  • Label:
  • Definition: gravimetric water content on soil sample used to measure extractable C and microbial biomass C.
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NA = Missing or Not Measured
ppm_micbio
  • Label:
  • Definition: Soil microbial biomass C (ppm) (0-10 cm depth) measured on a TOC analyzer using chloroform fumigation extraction
  • Type: Physical quantity
  • Unit: partsPermillion
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NA = Missing or Not Measured
init_soilppm
  • Label:
  • Definition: Soil extractable organic C (ppm) (0-10 cm depth) from unfumigated soil samples measured on a TOC analyzer
  • Type: Physical quantity
  • Unit: partsPermillion
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • NA = Missing or Not Measured
Current
  • Label:
  • Definition: Treatment in 2017, after irrigation lines were shifted.
  • Type: Nominal
  • Missing values: None specified
Replicate
  • Label:
  • Definition: Irrigation line: (A) started in 1991, (B) started in 1993.
  • Type: Nominal
  • Missing values: None specified
Transect_1993
  • Label:
  • Definition: Previous treatment (1991-2016).
  • Type: Nominal
  • Missing values: None specified
Plot_1993
  • Label:
  • Definition: Plot designation 1991-2017, before irrigation lines were shifted. Plots that are currently in the reduced (R) treatment did not have plot numbers during this time
  • Type: Nominal
  • Missing values: None specified
Plot_1992
  • Label:
  • Definition: Plot designations in 1992, while second irrigation line was being added. These plot designations are not typically used.
  • Type: Nominal
  • Missing values: None specified

Variables: 

DataCode
  • Label:
  • Definition: Dataset code
  • Type: Nominal
  • Missing values: None specified
RecType
  • Label:
  • Definition: Record type
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
RecYear
  • Label:
  • Definition: Year of record
  • Type: Physical quantity
  • Unit: Year (YYYY)
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
RecMonth
  • Label:
  • Definition: Month of record
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
RecDay
  • Label:
  • Definition: Day of record
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Plot_2017
  • Label:
  • Definition: Plot designation in 2017, after irrigation lines were shifted
  • Type: Nominal
  • Missing values: None specified
Depth
  • Label:
  • Definition: Depth of soil sampling: "u" is 0-10 cm, "l" is 10-20 cm. The lower sampling was only possible in the uplands
  • Type: Nominal
  • Missing values: None specified
Live
  • Label:
  • Definition: Oven-dried mass of live roots in a 5-cm radius, 10-cm depth cylindrical soil sample.
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Dead
  • Label:
  • Definition: Oven-dried mass of dead roots in a 5-cm radius, 10-cm depth cylindrical soil sample.
  • Type: Physical quantity
  • Unit: gram
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
N_live
  • Label:
  • Definition: Nitrogen concentration by mass of live roots in a 5-cm radius, 10-cm depth cylindrical soil sample.
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
C_live
  • Label:
  • Definition: Carbon concentration by mass of live roots in a 5-cm radius, 10-cm depth cylindrical soil sample
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Current
  • Label:
  • Definition: Treatment in 2017, after irrigation lines were shifted.
  • Type: Nominal
  • Missing values: None specified
Replicate
  • Label:
  • Definition: Irrigation line: (A) started in 1991, (B) started in 1993.
  • Type: Nominal
  • Missing values: None specified
Replicate_ed
  • Label:
  • Definition: Irrigation lines as in "Replicate", but divided into uplands and lowlands to yield spatial "blocks".
  • Type: Nominal
  • Missing values: None specified
Transect_1993
  • Label:
  • Definition: Previous treatment (1991-2016).
  • Type: Nominal
  • Missing values: None specified
Plot_1993
  • Label:
  • Definition: Plot designation 1991-2017, before irrigation lines were shifted. Plots that are currently in the reduced (R) treatment did not have plot numbers during this time
  • Type: Nominal
  • Missing values: None specified
Plot_1992
  • Label:
  • Definition: Plot designations in 1992, while second irrigation line was being added. These plot designations are not typically used.
  • Type: Nominal
  • Missing values: None specified
notes
  • Label:
  • Definition: Any notes about samples.
  • Type: Nominal
  • Missing values: None specified

Variables: 

DataCode
  • Label:
  • Definition: Dataset code
  • Type: Nominal
  • Missing values: None specified
RecType
  • Label:
  • Definition: Record type
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
RecDate
  • Label:
  • Definition: Date that data was collected
  • Type: Date/time
  • Date format: YYYY-MM-DD
  • Missing values: None specified
Flux
  • Label:
  • Definition: Soil CO2 flux measured by a LI-6800, in μmol/m2/s
  • Type: Physical quantity
  • Unit: MicromolePerSecondPerSquareMeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Current
  • Label:
  • Definition: Treatment in 2017, after irrigation lines were shifted.
  • Type: Nominal
  • Missing values: None specified
Replicate
  • Label:
  • Definition: Irrigation line: (A) started in 1991, (B) started in 1993.
  • Type: Nominal
  • Missing values: None specified
Replicate_ed
  • Label:
  • Definition: Irrigation lines as in "Replicate", but divided into uplands and lowlands to yield spatial "blocks".
  • Type: Nominal
  • Missing values: None specified
Transect_1993
  • Label:
  • Definition: Previous treatment (1991-2016).
  • Type: Nominal
  • Missing values: None specified
Plot_1993
  • Label:
  • Definition: Plot designation 1991-2017, before irrigation lines were shifted. Plots that are currently in the reduced (R) treatment did not have plot numbers during this time
  • Type: Nominal
  • Missing values: None specified
Plot_1992
  • Label:
  • Definition: Plot designations in 1992, while second irrigation line was being added. These plot designations are not typically used.
  • Type: Nominal
  • Missing values: None specified

Variables: 

DataCode
  • Label:
  • Definition: Dataset code
  • Type: Nominal
  • Missing values: None specified
RecType
  • Label:
  • Definition: Record type
  • Type: Physical quantity
  • Unit: dimensionless
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
RecYear
  • Label:
  • Definition: Year of record
  • Type: Physical quantity
  • Unit: Year (YYYY)
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Plot_2017
  • Label:
  • Definition: Plot designation in 2017, after irrigation lines were shifted
  • Type: Nominal
  • Missing values: None specified
PercentN
  • Label:
  • Definition: Percent N by mass of soil 0-10 cm.
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
PercentC
  • Label:
  • Definition: Percent C by mass of soil 0-10 cm.
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
Current
  • Label:
  • Definition: Treatment in 2017, after irrigation lines were shifted.
  • Type: Nominal
  • Missing values: None specified
Replicate
  • Label:
  • Definition: Irrigation line: (A) started in 1991, (B) started in 1993.
  • Type: Nominal
  • Missing values: None specified
Replicate_ed
  • Label:
  • Definition: Irrigation lines as in "Replicate", but divided into uplands and lowlands to yield spatial "blocks".
  • Type: Nominal
  • Missing values: None specified
Transect_1993
  • Label:
  • Definition: Previous treatment (1991-2016).
  • Type: Nominal
  • Missing values: None specified
Plot_1993
  • Label:
  • Definition: Plot designation 1991-2017, before irrigation lines were shifted. Plots that are currently in the reduced (R) treatment did not have plot numbers during this time
  • Type: Nominal
  • Missing values: None specified
Plot_1992
  • Label:
  • Definition: Plot designations in 1992, while second irrigation line was being added. These plot designations are not typically used.
  • Type: Nominal
  • Missing values: None specified

Categories
Dates

Date Range: 

Wednesday, March 1, 2017 to Thursday, December 31, 2020

Publication Date: 

Thursday, April 21, 2022
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