Arthropod data from 150 grassland plots, 2008-2017, and 140 forest plots, 2008-2016, used in "Arthropod decline in grasslands and forests is associated with drivers at landscape level", Nature

To disentangle local and landscape-level effects of land use on the temporal trends of arthropod communities in grasslands and forests, arthropod data were collected annually during the growing period from 2008 to 2017 by standardized sampling at 150 grassland plots and from 2008 to 2016 at 30 forest plots. An additional 118 forest plots were sampled in 2008, 2011 and 2014 to test the overall trend across a larger number of plots. Both grassland and forest plots cover gradients in local land-use intensity. Land-use intensity was quantified in the form of compound indices based on grazing, mowing and fertilization intensity in grasslands (LUI), and on recent biomass removal, the proportion of non-native tree species and deadwood origin in forests (ForMI). To analyze landscape-level effects, we quantified the cover of arable fields and grassland within 1500m radius around each sampling plot (based on ATKIS DLM). We modelled temporal trends in biomass, abundance and species number of arthropods and of different dispersal and trophic guilds separately for grasslands and forests, and tested for effects of local and landscape-scale land-use intensity on these trends, accounting for weather conditions and different spatial scales.