Interannual Variability in Net Primary Production and Precipitation

annual variability in aboveground net pri-mary production (ANPP) is not related to fluctuations in precipitation, based on anal-ysis of data from 11 Long-Term Ecological Research sites across North America. This finding, if applicable to other regions, is crucial to climate change research, because it may necessitate revisions of projections of ecosystem responses to climate change (2, 3). To examine the relationship between variability in net primary production (NPP) and precipitation at a broad scale, a long-term normalized difference vegetation in-dex (NDVI) data set derived from the Ad-vanced Very High Resolution Radiomete