Root Excision and Dehydration Effects on Water Uptake in Four Range Species
Journal of range management
Geminating seeds of created wbeatgasa (Agropyron darer-ton&, Russian wildrye (Eymus junceus), alfalfa (Medkago sativa), and cicer miIkvctcb (Astragalus c&r) were dehydrated for 4 days at -22 MPa, and/or their roots were excised, and used as treated materials. In an experiment in root growth boxes, where the seedlings depended for 60 days on the InitiaI soiI water supply, semhai primary and seminal lateral roots of grassen penetrnted to tbe same depth. Both types of roots were simiIarly effecthe
... simiIarly effecthe in taking up water, mainly from the upper SO cm of the soil profile. In a seaIed pot experiment under fhvorable moisture conditions, water uptake increased wItb seedling age up to 34 and 41 days for crested wheatgrass and Russian wiidrye, respectheiy, and up to the end of the experiment (53 days) for tbe legume species. Leaf area of grasses was not affected by root excision aIone, but it decreased due to the combined effects of root excision and temporary debydration. Leaf area was generally proportional to water uptake within each spedes. In aU 4 species, root excision and temporary dehydration did not affect transportation rates, while transportation rate decreased as a fimction of age. Transportation rates were higher in legumes than grasses and were bigber in Rwsiao wiidrye than crested wheatgrass.