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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Types Citation (1) Contacts Jayne Belnap Maxwell Richardson Nathan J Wojcik Robert L Sanford Jr Sarah Gopalani Categories Publication (1) View Results as: JSON ATOM CSV

Cheatgrass (Bromus tectorum L.) and seasonal patterns of soil phosphorus availability in arid ecosystems Seasonal changes in soil phosphorus (P) availability are not yet known for many ecosystems. We report seasonal changes in several pools of soil phosphorus, including plant available P from the Mojave Desert and Colorado Plateau. In addition we show that cheatgrass changes soil P fractions in unexpected and ecologically significant ways. Monthly soil samples (0-10 cm) from four sites in Canyonlands National Park in southeast Utah, are analyzed for P with a modified Hedley P fractionation method. Labile P (plant available) peaks in spring and autumn with significant monthly variation. Surprisingly, HCl extractable P changes as well, with a pattern inverse to that of labile P. Each of these sites has considerable Bromus... Categories: Publication; Types: Citation, ScienceBase Citation; Tags: 88th Annual Meeting of The Ecological Society of America, Bromus tectorum, University of Denver, phosphorus, seasonal, All tags... soil, Fewer tags