Extreme drought impacts have been underestimated in grasslands and shrublands globally

Melinda D. Smith, Kate D. Wilkins, Martin C. Holdrege, Peter Wilfahrt, Scott L. Collins, Alan K. Knapp, Osvaldo E. Sala, Jeffrey S. Dukes, Richard P. Phillips, Laura Yahdjian, Laureano A. Gherardi, Timothy Ohlert, Claus Beier, Lauchlan H. Fraser, Anke Jentsch, Michael E. Loik, Fernando T. Maestre, Sally A. Power, Qiang Yu, Andrew J. FeltonSeth M. Munson, Yiqi Luo, Hamed Abdoli, Mehdi Abedi, Concepción L. Alados, Juan Alberti, Moshe Alon, Hui An, Brian Anacker, Maggie Anderson, Harald Auge, Seton Bachle, Khadijeh Bahalkeh, Michael Bahn, Amgaa Batbaatar, Taryn Bauerle, Karen H. Beard, Kai Behn, Ilka Beil, Lucio Biancari, Irmgard Blindow, Viviana Florencia Bondaruk, Elizabeth T. Borer, Edward W. Bork, Carlos Martin Bruschetti, Kerry M. Byrne, James F. Cahill, Dianela A. Calvo, Michele Carbognani, Augusto Cardoni, Cameron N. Carlyle, Miguel Castillo-Garcia, Scott X. Chang, Jeff Chieppa, Marcus V. Cianciaruso, Ofer Cohen, Amanda L. Cordeiro, Daniela F. Cusack, Sven Dahlke, Pedro Daleo, Carla M. D'Antonio, Lee H. Dietterich, Tim S. Doherty, Maren Dubbert, Anne Ebeling, Nico Eisenhauer, Felícia M. Fischer, Tai G.W. Forte, Tobias Gebauer, Beatriz Gozalo, Aaron C. Greenville, Karlo G. Guidoni-Martins, Heather J. Hannusch, Siri Vatsø Haugum, Yann Hautier, Mariet Hefting, Hugh A.L. Henry, Daniela Hoss, Oscar Iribarne, Forest Isbell, Yari Johnson, Samuel Jordan, Eugene F. Kelly, Kaitlin Kimmel, Juergen Kreyling, György Kröel-Dulay, Johannes Ingrisch, Alicia Kröpfl, Angelika Kübert, Andrew Kulmatiski, Eric G. Lamb, Klaus Steenberg Larsen, Julie Larson, Cintia V. Leder, Anja Linstädter, Jielin Liu, Shirong Liu, Alexandra G. Lodge, Grisel Longo, Alejandro Loydi, Junwei Luan, Jason Lawson, Frederick Curtis Lubbe, Craig Macfarlane, Kathleen Mackie-Haas, Andrey V. Malyshev, Adrián Maturano-Ruiz, Thomas Merchant, Daniel B. Metcalfe, Akira S. Mori, Edwin Mudongo, Gregory S. Newman, Uffe N. Nielsen, Dale Nimmo, Yujie Niu, Paola Nobre, Rory C. O'Connor, Romà Ogaya, Gastón R. Oñatibia, Ildikó Orbán, Brooke Osborne, Rafael Otfinowski, Meelis Pärtel, Josep Penuelas, Pablo L. Peri, Guadalupe Peter, Alessandro Petraglia, Catherine Picon-Cochard, Valério D. Pillar, Juan Manuel Piñeiro-Guerra, Laura W. Ploughe, Robert M. Plowes, Cristy Portales-Reyes, Suzanne M. Prober, Yolanda Pueyo, Sasha C. Reed, Euan G. Ritchie, Dana Aylén Rodríguez, William E. Rogers, Christiane Roscher, Ana M. Sánchez, Bráulio A. Santos, María Cecilia Scarfó, Eric W. Seabloom, Baoku Shi, Lara Souza, Andreas Stampfli, Rachel J. Standish, Marcelo Sternberg, Wei Sun, Marie Sünnemann, Michelle Tedder, Pål Thorvaldsen, Dashuan Tian, Katja Tielbörger, Alejandro Valdecantos, Liesbeth van den Brink, Vigdis Vandvik, Mathew R. Vankoughnett, Liv Guri Velle, Changhui Wang, Yi Wang, Glenda M. Wardle, Christiane Werner, Cunzheng Wei, Georg Wiehl, Jennifer L. Williams, Amelia A. Wolf, Michaela Zeiter, Fawei Zhang, Juntao Zhu, Ning Zong, Xiaoan Zuo

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Climate change is increasing the frequency and severity of short-term (~1 y) drought events—the most common duration of drought—globally. Yet the impact of this intensification of drought on ecosystem functioning remains poorly resolved. This is due in part to the widely disparate approaches ecologists have employed to study drought, variation in the severity and duration of drought studied, and differences among ecosystems in vegetation, edaphic and climatic attributes that can mediate drought impacts. To overcome these problems and better identify the factors that modulate drought responses, we used a coordinated distributed experiment to quantify the impact of short-term drought on grassland and shrubland ecosystems. With a standardized approach, we imposed ~a single year of drought at 100 sites on six continents. Here we show that loss of a foundational ecosystem function—aboveground net primary production (ANPP)—was 60% greater at sites that experienced statistically extreme drought (1-in-100-y event) vs. those sites where drought was nominal (historically more common) in magnitude (35% vs. 21%, respectively). This reduction in a key carbon cycle process with a single year of extreme drought greatly exceeds previously reported losses for grasslands and shrublands. Our global experiment also revealed high variability in drought response but that relative reductions in ANPP were greater in drier ecosystems and those with fewer plant species. Overall, our results demonstrate with unprecedented rigor that the global impacts of projected increases in drought severity have been significantly underestimated and that drier and less diverse sites are likely to be most vulnerable to extreme drought.

Original languageEnglish (US)
Article numbere2309881120
JournalProceedings of the National Academy of Sciences of the United States of America
Volume121
Issue number4
DOIs
StatePublished - 2024
Externally publishedYes

Keywords

  • climate extreme | Drought-Net | International Drought Experiment | productivity

ASJC Scopus subject areas

  • General

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