Increasing effects of chronic nutrient enrichment on plant diversity loss and ecosystem productivity over time

Eric W. Seabloom, Peter B. Adler, Juan Alberti, Lori Biederman, Yvonne M. Buckley, Marc W. Cadotte, Scott L. Collins, Laura Dee, Philip A. Fay, Jennifer Firn, Nicole Hagenah, W. Stanley Harpole, Yann Hautier, Andy Hector, Sarah E. Hobbie, Forest Isbell, Johannes M.H. Knops, Kimberly J. Komatsu, Ramesh Laungani, Andrew MacDougallRebecca L. McCulley, Joslin L. Moore, John W. Morgan, Timothy Ohlert, Suzanne M. Prober, Anita C. Risch, Martin Schuetz, Carly J. Stevens, Elizabeth T. Borer

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74 Citations (Scopus)


Human activities are enriching many of Earth’s ecosystems with biologically limiting mineral nutrients such as nitrogen (N) and phosphorus (P). In grasslands, this enrichment generally reduces plant diversity and increases productivity. The widely demonstrated positive effect of diversity on productivity suggests a potential negative feedback, whereby nutrient-induced declines in diversity reduce the initial gains in productivity arising from nutrient enrichment. In addition, plant productivity and diversity can be inhibited by accumulations of dead biomass, which may be altered by nutrient enrichment. Over longer time frames, nutrient addition may increase soil fertility by increasing soil organic matter and nutrient pools. We examined the effects of 5–11 yr of nutrient addition at 47 grasslands in 12 countries. Nutrient enrichment increased aboveground live biomass and reduced plant diversity at nearly all sites, and these effects became stronger over time. We did not find evidence that nutrient-induced losses of diversity reduced the positive effects of nutrients on biomass; however, nutrient effects on live biomass increased more slowly at sites where litter was also increasing, regardless of plant diversity. This work suggests that short-term experiments may underestimate the long-term nutrient enrichment effects on global grassland ecosystems.

Original languageEnglish
Article numbere03218
Number of pages11
Issue number2
Publication statusPublished - Feb 2021


  • biodiversity
  • community ecology
  • ecosystem ecology, grasslands
  • NutNet
  • nutrient network

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