The aim of the yearly biomass measurements in the grasslands is to study the effect of weather to the plant production along a productivity gradient. Aboveground living plant biomass data from 24-30 grassland patches in Orgovány region of Kiskunság (Kiskunság National Park) along a productivity gradient from open sand grassland to reedbed, yearly from 2003 to 2012, were sampled approx. at the time of maximum aboveground biomass. The size of the patches are 20 to 50 sq-m, and each year one 0.5 by 0.5 m sampling unit is selected within each patch. The patches are permanent ones; some of them were omitted and replaced because of disturbance in several years. The total aboveground living plant biomass and LAI data are submitted in HU_SI001199_lai_biomass_20130508 dataset, and the EUNIS habitat types of the sampled patches are submitted in HU_SI001199_eunis_habitat_type_20130508 dataset.