title: Short and Long-Term Soil Moisture Effects of Liana Removal in a Seasonally Moist Tropical Forest.
abstract: Lianas (woody vines) are particularly abundant in tropical forests, and their abundance is increasing in the neotropics. Lianas can compete intensely with trees for above- and belowground resources, including water. As tropical forests experience longer and more intense dry seasons, competition for water is likely to intensify. However, we lack an understanding of how liana abundance affects soil moisture and hence competition with trees for water in tropical forests. To address this critical knowledge gap, we conducted a large-scale liana removal experiment in a seasonal tropical moist forest in central Panama. We monitored shallow and deep soil moisture over the course of three years to assess the effects of lianas in eight 0.64 ha removal plots and eight control plots. Liana removal caused short-term effects in surface soils. Surface soils (10 cm depth) in removal plots dried more slowly during dry periods and accumulated water more slowly after rainfall events. These effects disappeared within four months of the removal treatment. In deeper soils (40 cm depth), liana removal resulted in a multi-year trend towards 5-25% higher soil moisture during the dry seasons with the largest significant effects occurring in the dry season of the third year following treatment. Liana removal did not affect surface soil temperature. Multiple and mutually occurring mechanisms may be responsible for the effects of liana removal on soil moisture, including competition with trees, and altered microclimate, and soil structure. These results indicate that lianas influence hydrologic processes, which may affect tree community dynamics and forest carbon cycling.
authors.affiliation: Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, Minnesota, United States of America.
authors.forename: Joseph Pignatello
authors.initials: JP
authors.lastname: Reid
authors.affiliation: Department of Biological Sciences, Marquette University, Milwaukee, WI, 53201-1881, United States of America.|Smithsonian Tropical Research Institute, Balboa, República de Panamá
authors.forename: Stefan A
authors.initials: SA
authors.lastname: Schnitzer
authors.affiliation: Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, Minnesota, United States of America.|Smithsonian Tropical Research Institute, Balboa, República de Panamá|Department of Plant Biology, University of Minnesota, St. Paul, Minnesota, United States of America.
authors.forename: Jennifer S
authors.initials: JS
authors.lastname: Powers
mesh_terms: D065928:Forests; D010944:Plants; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014329:Tropical Climate; D014934:Wood
chemical_list: D012987:Soil