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Roots may promote infiltration and thus reduce runoff and soil erosion; they may also serve as pathways for water to move to the groundwater, facilitating groundwater recharge. By increasing our knowledge of these processes we hope to make recommendations for the better management of vegetation in arid lands of the Mediterranean. (http://www.silsoe.cranfield.ac.uk/iwe/medalus.htm)

In the semi-arid grassland on the Arid Lands Ecology Reserve on the Hanford Site in south-central Washington State, three legume flushes occurred in the past decade.Estimates of leguminous nitrogen in both native and disturbed vegetation after a flush showed that nitrogen in the legume (above-ground) doubled the amount of nitrogen associated with vascular plant tissues.( http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=6444278)