E097 - Nitrogen Addition and Dynamics of Recovery from Cessation of N Addition
Introduction
To determine the dynamics of recovery after cessation of N addition, N addition was halted in 3 plots per treatment randomly chosen from among the 6 total replicates per treatment in one of the 7 N addition sites in 1993. For a description of these plots, see E002 - Long-Term Nitrogen Deposition During Grassland Succession. Current work is in all plots in the E002 field are being recorded under experiment number E002
Key Results
Although nutrient enrichment frequently decreases biodiversity, it remains unclear whether such biodiversity losses are readily reversible, or are critical transitions between alternative low- and high-diversity stable states that could be difficult to reverse. Our 30-year grassland experiment shows that plant diversity decreased well below control levels after 10 years of chronic high rates (95–270 kg N ha-1 year-1) of nitrogen addition, and did not recover to control levels 20 years after nitrogen addition ceased. Thus, the regime shifts between alternative stable states that have been reported for some nutrient-enriched aquatic ecosystems may also occur in grasslands. Isbell et al. 2013 Ecology Letters
Methods for e097
Datasets for e097: Nitrogen Addition and Dynamics of Recovery from Cessation of N Addition
Dataset ID | Title | Range of Years (# years with data) |
---|---|---|
lpe097 | Percent light penetration | 1982-1990 (9 years) |
ple097 | Plant aboveground biomass data | 1982-2011 (23 years) |
rbe097 | Root biomass data | 1988-1992 (4 years) |
mse097 | Small mammal abundance | 1982-1985 (4 years) |
cae097 | Soil Calcium | 1982-1982 (1 year) |
care097 | Soil carbon | 1982-2011 (3 years) |
mge097 | Soil magnesium | 1982-1982 (1 year) |
nohe097 | Soil nitrate and ammonium | 1985-2002 (6 years) |
ne097 | Soil nitrogen | 1982-2011 (4 years) |
phe097 | Soil pH | 1982-1990 (5 years) |
pe097 | Soil phosphorous | 1982-1982 (1 year) |
ke097 | Soil potassium | 1982-1982 (1 year) |
Selected Recent Publications
Hautier, Y.; Tilman, D.; Isbell, F.; Seabloom, E. W.; Borer, E. T.; Reich, P. B.; Anthropogenic environmental changes affect ecosystem stability via biodiversity. Science, 2015, 348, 6232, 336-340 DOI:10.1126/science.aaa1788 2015 [Full Text] e001 e002 e003 e012 e098 e120 e141 e245 e247 e248
Tilman, D.; Reich, P. B.; Isbell, F.; Biodiversity impacts ecosystem productivity as much as resources, disturbance, or herbivory; Proceedings of the National Academy of Sciences; 2012; 109, 26, 10394-10397 2012 [Full Text] e001 e002 e003 e004 e012 e062 e098 e120 e141 e172