Abstract
Landslides are a frequent disturbance in montane tropical rainforests that result in heterogeneous environments for plant and soil development. Natural inputs of organic matter and associated nutrients contribute to soil fertility patchiness within landslides. To test the importance of organic matter and nutrient addition to landslide soil fertility and plant growth, we mixed three types of organic matter substrates that are common to landslides (Cecropia leaves, Cyathea fronds, and forest soil) and commercial fertilizer into recently eroded soil on five landslides in Puerto Rico. In addition, we sowed seeds of two common landslide colonists (Paspalum and Phytolacca) into the soil treatment plots in order to test treatment effects on seed germination and seedling growth. Soils, seed germination, and seedling growth were monitored for one year and the field experiment was replicated in a one-year screen-house experiment. Despite highly variable initial landslide conditions, responses to soil treatments were similar across all five landslides. The forest soil addition increased total soil nitrogen and soil organic matter on landslides within 60 days, whereas Cecropia leaves provided increased soil organic matter only after 210 days. Commercial fertilizer increased plant-available soil nitrogen and phosphorus within 60 days, and also increased seed germination of Paspalum seeds when compared to soils treated with Cecropia leaves. Despite these positive effects of treatments on soils and germination, there were no treatment effects on seedling growth in the field, perhaps due to leaching or other losses of soil nutrients evident in the lack of significant treatment differences in soil resources at 370 days. In the screen-house, forest soil and commercial fertilizer treatments significantly increased soil fertility and seedling growth of both Paspalum and Phytolacca compared to control treatments. These different responses to three common types of organic matter inputs create patchy soil conditions with important implications for plant colonization and landslide succession.
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Acknowledgements
This research was funded by a cooperative grant from the U.S. National Science Foundation, University of Puerto Rico, and the U.S. Forest Service, supporting the LEF Long-term Ecological Research Program (NSF grant no. DEB-00805238). Additional funding was provided by the University of Nevada, Las Vegas International Programs and the Department of Biological Sciences. We thank L. Weiss for her field and laboratory assistance throughout the duration of the project, as well as her encouragement to the primary author throughout this study. Helpful suggestions on the development of the project were provided by P. Klawinski, D.J. Lodge, H. Ruan, J. Thompson, and X. Zou. Additional field and laboratory assistance was provided by M. Aponte, T. Bragg, J. Falk-Sørensen, F. Landau, E. Noel, N. Pascual, and J. Shiels. We also thank B. Buck, F. Scatena, D. Liptzin, D. Wagner, J. Zimmerman, X. Zou, and two anonymous reviewers for their helpful comments on an earlier draft of the manuscript.
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Shiels, A.B., Walker, L.R. & Thompson, D.B. Organic matter inputs create variable resource patches on Puerto Rican landslides. Plant Ecol 184, 223–236 (2006). https://doi.org/10.1007/s11258-005-9067-2
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DOI: https://doi.org/10.1007/s11258-005-9067-2