Decreased water flowing from a forest amended with calcium silicate

TitleDecreased water flowing from a forest amended with calcium silicate
Publication TypeJournal Article
Year of Publication2013
AuthorsGreen, MB, Bailey, AS, Bailey, SW, Battles, JJ, Campbell, JL, Driscoll, CT, Fahey, TJ, Lepine, LC, Likens, GE, Ollinger, SV, Schaberg, PG
JournalProceedings of the National Academy of Science
Volume110
Issue15
Pagination5999 - 6003
Date Published2013///
Abstract

Acid deposition during the 20th century caused widespread depletion of available soil calcium (Ca) throughout much of the industrialized world. To better understand how forest ecosystems respond to changes in a component of acidification stress, an 11.8-ha watershed was amended with wollastonite, a calcium silicate mineral, to restore available soil Ca to preindustrial levels through natural weathering. An unexpected outcome of the Ca amendment was a change in watershed hydrology; annual evapotranspiration increased by 25%, 18%, and 19%, respectively, for the 3 y following treatment before returning to pretreatment levels. During this period, the watershed retained Ca from the wollastonite, indicating a watershed-scale fertilization effect on transpiration. That response is unique in being a measured manipulation of watershed runoff attributable to fertilization, a response of similar magnitude to effects of deforestation. Our results suggest that past and future changes in available soil Ca concentrations have important and previously unrecognized implications for the water cycle.

URLhttp://www.treesearch.fs.fed.us/pubs/43311