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Little is known about the composition and function of the mycorrhizal fungal community in riparian areas, or its importance in competitive interactions between Populus fremontii, a dominant tree in southwestern United States riparian forests which forms arbuscular and ectomycorrhizas, and Tamarix ramosissima, an introduced tree species that has spread into riparian areas. The objectives of this study...
Saltcedar (Tamarix chinensis) reportedly has altered ecosystem function in many riparian areas of the American Southwest. I investigated the functional role of this exotic species relative to native Fremont cottonwood (Populus fremontii) along the free-flowing middle San Pedro River in southern Arizona. Floodplains in this river reach are co-dominated by young stands of saltcedar (<44 yrs old)...
Large expanses of riverine marsh are rare in the desert Southwest, given the dry surface of many floodplain soils. Along the Hassayampa River, riverine marsh underwent a 5-fold increase (from 2% to 9% of the floodplain-channel area) after a large winter flood in 1993. Flood waters eroded terraces that had aggraded during frequent, smaller floods, widened the channel from about 3 to 50 m, and recharged...
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