01447nas a2200145   4500008004100000245008200041210006900123300001300192490000800205520092200213653002301135100002001158700001601178856010701194       2001                        eng d00aVariation among biomes in temporal dynamics of aboveground primary production0 aVariation among biomes in temporal dynamics of aboveground prima  a481 -4840 v2913 aInterannual variability in aboveground net primary production (ANPP) was assessed with long-term (mean = 12 years) data from 11 Long Term Ecological Research sites across North America. The greatest interannual variability in ANPP occurred in grasslands and old fields, with forests the least variable. At a continental scale, ANPP was strongly correlated with annual precipitation. However, interannual variability in ANPP was not related to variability in precipitation. Instead, maximum variability in ANPP occurred in biomes where high potential growth rates of herbaceous vegetation were combined with moderate variability in precipitation. In the most dynamic biomes, ANPP responded more strongly to wet than to dry years. Recognition of the fourfold range in ANPP dynamics across biomes and of the factors that constrain this variability is critical for detecting the biotic impacts of global change phenomena.10aPrimary production1 aKnapp, Alan, K.1 aSmith, M.D.  uhttp://knz.lternet.edu/content/variation-among-biomes-temporal-dynamics-aboveground-primary-production