skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Vulnerability of crops and native grasses to summer drying in the U.S. Southern Great Plains

Journal Article · · Agriculture, Ecosystems and Environment

The Southern Great Plains are characterized by a fine-scale mixture of different land-cover types, predominantly winter-wheat and grazed pasture, with relatively small areas of other crops, native prairie, and switchgrass. Recent droughts and predictions of increased drought in the Southern Great Plains, especially during the summer months, raise concern for these ecosystems. We measured ecosystem carbon and water fluxes with eddy-covariance systems over cultivated cropland for 10 years, and over lightly grazed prairie and new switchgrass fields for 2 years each. Growing-season precipitation showed the strongest control over net carbon uptake for all ecosystems, but with a variable effect: grasses (prairie and switchgrass) needed at least 350. mm of precipitation during the growing season to become net carbon sinks, while crops needed only 100. mm. In summer, high temperatures enhanced evaporation and led to higher likelihood of dry soil conditions. Therefore, summer-growing native prairie species and switchgrass experienced more seasonal droughts than spring-growing crops. For wheat, the net reduction in carbon uptake resulted mostly from a decrease in gross primary production rather than an increase in respiration. Flux measurements suggested that management practices for crops were effective in suppressing evapotranspiration and decomposition (by harvesting and removing secondary growth), and in increasing carbon uptake (by fertilizing and conserving summer soil water). In light of future projections for wetter springs and drier and warmer summers in the Southern Great Plains, our study indicates an increased vulnerability in native ecosystems and summer crops over time.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1245476
Alternate ID(s):
OSTI ID: 1213682; OSTI ID: 1470997
Journal Information:
Agriculture, Ecosystems and Environment, Journal Name: Agriculture, Ecosystems and Environment Vol. 213 Journal Issue: C; ISSN 0167-8809
Publisher:
ElsevierCopyright Statement
Country of Publication:
Netherlands
Language:
English
Citation Metrics:
Cited by: 47 works
Citation information provided by
Web of Science

References (44)

Pulse events in Great Basin Desert shrublands: physiological responses of Artemisia tridentata and Purshia tridentata seedlings to increased summer precipitation journal October 2004
Is a Transition to Semipermanent Drought Conditions Imminent in the U.S. Great Plains? journal December 2012
Carbon balance of a three crop succession over two cropland sites in South West France journal October 2009
Can Abundant Summer Precipitation Counter Losses in Herbage Production Caused by Spring Drought? journal July 2006
Comparison of carbon fluxes, growth and productivity of a winter wheat crop in three contrasting growing seasons journal April 2011
Preliminary use of ground-penetrating radar and electrical resistivity tomography to study tree roots in pine forests and poplar plantations journal January 2008
Climatic patterns and the distribution of C4 grasses in North America journal March 1976
The effects of precipitation timing on sagebrush steppe vegetation journal March 2006
Growing season variability in evapotranspiration, ecosystem water use efficiency, and energy partitioning in switchgrass: SEASONAL VARIABILITY IN SWITCHGRASS ET, WUE, AND ENERGY journal September 2012
On the Temperature Dependence of Soil Respiration journal June 1994
Testing a model of CO2, water and energy exchange in Great Plains tallgrass prairie and wheat ecosystems journal August 2005
Response of ecosystem carbon fluxes to drought events in a poplar plantation in Northern China journal July 2013
Carbon, water, and heat flux responses to experimental burning and drought in a tallgrass prairie journal December 2012
Primary Production of the Central Grassland Region of the United States journal February 1988
Carbon sequestration by a crop over a 4-year sugar beet/winter wheat/seed potato/winter wheat rotation cycle journal March 2009
Drought in the Southeastern United States: Causes, Variability over the Last Millennium, and the Potential for Future Hydroclimate Change journal October 2009
Resurvey of Grasses, Forbs, and Underground Plant Parts at the End of the Great Drought journal January 1943
Interannual variation of evapotranspiration from forest and grassland ecosystems in western canada in relation to drought journal October 2010
Gap filling strategies for defensible annual sums of net ecosystem exchange journal March 2001
A review of drought concepts journal September 2010
Estimating uncertainties in individual eddy covariance flux measurements: A comparison of methods and a proposed new method journal March 2011
Winter wheat carbon exchange in Thuringia, Germany journal January 2004
North American drought: Reconstructions, causes, and consequences journal March 2007
Mid-twenty-first century warm season climate change in the Central United States. Part I: regional and global model predictions journal December 2012
Primary Productivity and Precipitation-Use Efficiency in Mixed-Grass Prairie: A Comparison of Northern and Southern US Sites journal May 2009
Dynamics of evapotranspiration partitioning in a semi-arid forest as affected by temporal rainfall patterns journal May 2012
Severe drought effects on ecosystem CO2 and H2O fluxes at three Mediterranean evergreen sites: revision of current hypotheses? journal October 2002
The carbon budget of newly established temperate grassland depends on management intensity journal June 2007
Spatiotemporal Variations in Growing Season Exchanges of CO 2 , H 2 O, and Sensible Heat in Agricultural Fields of the Southern Great Plains journal October 2007
Summer drought influence on CO2 and water fluxes of extensively managed grassland in Germany journal April 2011
A Portable Eddy Covariance System for the Measurement of Ecosystem–Atmosphere Exchange of CO 2 , Water Vapor, and Energy journal April 2004
Predicting Agricultural Impacts of Large-Scale Drought: 2012 and the Case for Better Modeling journal January 2013
Seasonal changes in depth of water uptake for encroaching trees Juniperus virginiana and Pinus ponderosa and two dominant C4 grasses in a semiarid grassland journal December 2008
Sap flux-scaled transpiration and stomatal conductance response to soil and atmospheric drought in a semi-arid sagebrush ecosystem journal September 2012
Seasonal and interannual variability in 13 C composition of ecosystem carbon fluxes in the U.S. Southern Great Plains journal January 2011
Inter-annual variability in carbon dioxide exchange of an oak/grass savanna and open grassland in California journal December 2007
Effects of drought conditions on the carbon dioxide dynamics in a temperate peatland journal November 2012
Gross primary production and light response parameters of four Southern Plains ecosystems estimated using long-term CO 2 -flux tower measurements : GPP OF SOUTHERN PLAINS ECOSYSTEMS journal June 2003
Trends in 20th century drought over the continental United States: U.S. DROUGHT TRENDS journal May 2006
Carbon dioxide and water fluxes from switchgrass managed for bioenergy production journal August 2010
Environmental impact of agricultural nitrogen and phosphorus use journal September 1987
Drought Cycles and Landscape Responses to past Aridity on Prairies of the Northern Great Plains, usa journal March 2002
Spring drought regulates summer net ecosystem CO2 exchange in a sagebrush-steppe ecosystem journal March 2008
Summary and Interpretation of Underground Development in Natural Grassland Communities journal January 1958