Closed 1厂 communities 8 Relationships between (a) mean monthly Moisture Index(Ea/Eo) 0.6 (b the evaporation coefficient k(and Foliage Projective Cover)and the per- o is retained in the soil within the rooting o >/ open centage of annual precipitation which zone of the plant community. Below the 100% value of annual precipitation, 100 water may be lost by runoff or internal drain- Annual Precipitation Retained age; above 100% water may be gained by run Closed on or subsoil seepage from adjacent areas communities 0.8Relationships between (a) mean monthly Moisture Index (Ea/Eo) (b) the evaporation coefficient k (and Foliage Projective Cover) and the per￾centage of annual precipitation which is retained in the soil within the rooting zone of the plant community. Below the 100% value of annual precipitation, water may be lost by runoff or internal drain￾age; above 100% water may be gained by run￾on or subsoil seepage from adjacent areas