News Finding: In mountainous regions and areas with moist climates, where rocks are exposed and tend to weather quickly, we estimate that rock weathering doubles the amount of nitrogen that enters natural ecosystems.
Paper Finding: Moreover, in comparisons across systems where response variables and experimental designs can differ considerably, the analysis of change relative to the control is more meaningful than standardized absolute differences between means.
News Context: We identified bedrock as the source of this "missing nitrogen" by showing that rock weathering could help to meet nitrogen demand from plants and animals. In mountainous regions and areas with moist climates, where rocks are exposed and tend to weather quickly, we estimate that rock weathering doubles the amount of nitrogen that enters natural ecosystems. The nitrogen in the rock was feeding the ecosystem, allowing plants to accumulate more biomass than sites without much rock nitrogen weathering.
Paper Context: Unlike HedgeÕs d, the ln-response ratio does not require a measure of sample variability. Moreover, in comparisons across systems where response variables and experimental designs can differ considerably, the analysis of change relative to the control is more meaningful than standardized absolute differences between means. Our data show that both N and P limitation are strong and widespread in the major habitats of the biosphere ( Fig.