Journal Article root traits Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Review Soil below-ground ecology handbook plant root functions protocol root classification root ecology trait measurements Adaptive plasticity OpenSimRoot Published Erratum belowground ecology ecosystem properties and processes enotype×environment interaction environmental gradients functional-structural plant model model-driven phenotyping phenotypic variation plant functions plant nutrition root architectural traits root responses root system architecture simulation soil bulk density