Title: Assessing precipitation, evapotranspiration, and NDVI as controls of U.S. Great Plains plant production

Abstract

Productivity throughout the North American Great Plains grasslands is generally considered to be water limited, with the strength of this limitation increasing as precipitation decreases. We hypothesize that cumulative actual evapotranspiration water loss (AET) from April to July is the precipitation-related variable most correlated to aboveground net primary production (ANPP) in the U.S. Great Plains (GP). We tested this by evaluating the relationship of ANPP to AET, precipitation, and plant transpiration (Tr). We used multi-year ANPP data from five sites ranging from semiarid grasslands in Colorado and Wyoming to mesic grasslands in Nebraska and Kansas, mean annual NRCS ANPP, and satellite-derived normalized difference vegetation index (NDVI) data. Results from the five sites showed that cumulative April-to-July AET, precipitation, and Tr were well correlated (R²: 0.54–0.70) to annual changes in ANPP for all but the wettest site. AET and Tr were better correlated to annual changes in ANPP compared to precipitation for the drier sites, and precipitation in August and September had little impact on productivity in drier sites. April-to-July cumulative precipitation was best correlated (R² = 0.63) with interannual variability in ANPP in the most mesic site, while AET and Tr were poorly correlated with ANPP at this site. Cumulativemore » growing season (May-to-September) NDVI (iNDVI) was strongly correlated with annual ANPP at the five sites (R² = 0.90). Using iNDVI as a surrogate for ANPP, we found that county-level cumulative April–July AET was more strongly correlated to ANPP than precipitation for more than 80% of the GP counties, with precipitation tending to perform better in the eastern more mesic portion of the GP. Including the ratio of AET to potential evapotranspiration (PET) improved the correlation of AET to both iNDVI and mean county-level NRCS ANPP. Accounting for how different precipitation-related variables control ANPP (AET in drier portion, precipitation in wetter portion) provides opportunity to develop spatially explicit forecasting of ANPP across the GP for enhancing decision-making by land managers and use of grassland ANPP for biofuels.« less

Authors:

Chen, Maosi  ^[1];

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Parton, William J. ^[1]; Hartman, Melannie D. ^[1]; Del Grosso, Stephen J. ^[2]; Smith, William K. ^[3]; Knapp, Alan K. ^[4]; Lutz, Susan ^[5]; Derner, Justin D. ^[6]; Tucker, Compton J. ^[7]; Ojima, Dennis S. ^[5]; Volesky, Jerry D. ^[8]; Stephenson, Mitchell B. ^[9]; Schacht, Walter H. ^[10]; Gao, Wei ^[11]

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+ Show Author Affiliations

1. United States Department of Agriculture UV‐B Monitoring and Research Program Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado 80521 USA
2. Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado 80523 USA, Agricultural Research Service U.S. Department of Agriculture Fort Collins Colorado 80526 USA
3. School of Natural Resources and the Environment University of Arizona Tucson Arizona 85721 USA
4. Department of Biology and Graduate Degree Program in Ecology Colorado State University Fort Collins Colorado 80523 USA
5. Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado 80523 USA
6. Agricultural Research Service U.S. Department of Agriculture Cheyenne Wyoming 82009 USA
7. Earth Resources Branch NASA/Goddard Space Flight Center Greenbelt Maryland 20771 USA
8. Department of Agronomy and Horticulture University of Nebraska‐Lincoln North Platte Nebraska 69101 USA
9. Department of Agronomy and Horticulture University of Nebraska‐Lincoln Scottsbluff Nebraska 69361 USA
10. Department of Agronomy and Horticulture University of Nebraska‐Lincoln Lincoln Nebraska 68583 USA
11. United States Department of Agriculture UV‐B Monitoring and Research Program Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado 80521 USA, Department of Ecosystem Science and Sustainability Colorado State University Fort Collins Colorado 80523 USA

Publication Date:

Tue Oct 08 00:00:00 EDT 2019

Research Org.:

Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Biological and Environmental Research (BER); USDA

OSTI Identifier:

1570081

Alternate Identifier(s):

OSTI ID: 1570083; OSTI ID: 1571264

Grant/Contract Number:  

SC0018420; 2016-34263-25763

Resource Type:

Published Article

Journal Name:

Ecosphere

Additional Journal Information:

Journal Name: Ecosphere Journal Volume: 10 Journal Issue: 10; Journal ID: ISSN 2150-8925

Publisher:

Ecological Society of America

Country of Publication:

United States

Language:

English

Subject:

59 BASIC BIOLOGICAL SCIENCES; aboveground net primary production; cumulative actual evapotranspiration water loss; cumulative growing season normalized difference vegetation indes; North American Great Plains grasslands