Global annual root turnover in different ecosystems Annual root turnover ( of maximum root mass) Trees: total root system 0 Trees: fine roots 56 Grasslands Shrublands 34 Wetlands 55 Gilt and Jackson 2003Global annual root turnover in different ecosystems Gill and Jackson 2003 Annual root turnover (% of maximum root mass) 10 56 53 34 55 Trees: total root system Trees: fine roots Grasslands Shrublands Wetlands