NDLI: Organic matter inputs create variable resource patches on Puerto Rican landslides

Content Provider	Springer Nature Link
Author	Shiels, Aaron B. Walker, Lawrence R. Thompson, Daniel B.
Copyright Year	2005
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.
Starting Page	223
Ending Page	236
Page Count	14
File Format	PDF
ISSN	13850237
Journal	Plant Ecology
Volume Number	184
Issue Number	2
e-ISSN	15735052
Language	English
Publisher	Springer Netherlands
Publisher Date	2005-11-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Disturbance succession Seed germination Seedlings Soil fertility Soil nutrients Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science

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