Soil Effects on Forest Structure and Diversity in a Moist and a Dry Tropical Forest

Soil characteristics are important drivers of variation in wet tropical forest structure and diversity, but few studies have evaluated these relationships in drier forest types. Using tree and soil data from 48 and 32 1 ha plots, respectively, in a Bolivian moist and dry forest, we asked how soil conditions affect forest structure and diversity within each of the two forest types. After correcting for spatial effects, soil‐vegetation relationships differed between the dry and the moist forest, being strongest in the dry forest. Furthermore, we hypothesized that soil nutrients would play a more important role in the moist forest than in the dry forest because vegetation in the moist forest is less constrained by water availability and thus can show its full potential response to soil fertility. However, contrary to our expectations, we found that soil fertility explained a larger number of forest variables in the dry forest (50 percent) than in the moist forest (17 percent). Shannon diversity declined with soil fertility at both sites, probably because the most dominant, shade‐tolerant species strongly increased in abundance as soil fertility increased.

[1]  F. Bongers,et al.  Patterns and Determinants of Floristic Variation across Lowland Forests of Bolivia , 2011 .

[2]  F. Putz,et al.  Anthropogenic Soils and Tree Distributions in a Lowland Forest in Bolivia , 2009 .

[3]  F. Putz,et al.  Beyond reduced-impact logging: silvicultural treatments to increase growth rates of tropical trees , 2008 .

[4]  Gregory P Asner,et al.  The biogeochemical heterogeneity of tropical forests. , 2008, Trends in ecology & evolution.

[5]  H. Tuomisto,et al.  Congruence between floristic patterns of trees and lianas in a southwest Amazonian rain forest , 2007 .

[6]  O. Phillips,et al.  Continental-scale patterns of canopy tree composition and function across Amazonia , 2006, Nature.

[7]  H. Tuomisto,et al.  Edaphic and Floristic Variation within a 1‐ha Plot of Lowland Amazonian Rain Forest 1 , 2006 .

[8]  D. Burslem,et al.  Species–habitat associations in a Sri Lankan dipterocarp forest , 2006, Journal of Tropical Ecology.

[9]  T. Killeen,et al.  The Chiquitano Dry Forest, the Transition between Humid and Dry Forest in Eastern Lowland Bolivia , 2006 .

[10]  Frans Bongers,et al.  Architecture of 54 moist-forest tree species: traits, trade-offs, and functional groups. , 2006, Ecology.

[11]  G. Paoli,et al.  Soil nutrients and beta diversity in the Bornean Dipterocarpaceae: evidence for niche partitioning by tropical rain forest trees , 2006 .

[12]  W. Magnusson,et al.  Mesoscale distribution patterns of Amazonian understorey herbs in relation to topography, soil and watersheds , 2005 .

[13]  T. Gregoire,et al.  HABITAT CHARACTERIZATIONS UNDERESTIMATE THE ROLE OF EDAPHIC FACTORS CONTROLLING THE DISTRIBUTION OF ENTANDROPHRAGMA , 2004 .

[14]  Jens-Christian Svenning,et al.  Diversity and dominance in palm (Arecaceae) communities in terra firme forests in the western Amazon basin , 2004 .

[15]  D. Wardle,et al.  Ecological Linkages Between Aboveground and Belowground Biota , 2004, Science.

[16]  Daniel Sabatier,et al.  A spatial model of tree α-diversity and tree density for the Amazon , 2003, Biodiversity & Conservation.

[17]  O. Phillips,et al.  Prediction of neotropical tree and liana species richness from soil and climatic data , 1995, Biodiversity and Conservation.

[18]  Oliver L. Phillips,et al.  Habitat association among Amazonian tree species: a landscape‐scale approach , 2003 .

[19]  Kalle Ruokolainen,et al.  LINKING FLORISTIC PATTERNS WITH SOIL HETEROGENEITY AND SATELLITE IMAGERY IN ECUADORIAN AMAZONIA , 2003 .

[20]  Kalle Ruokolainen,et al.  Dispersal, Environment, and Floristic Variation of Western Amazonian Forests , 2003, Science.

[21]  K. Miyamoto,et al.  Habitat differentiation among tree species with small-scale variation of humus depth and topography in a tropical heath forest of Central Kalimantan, Indonesia , 2003, Journal of Tropical Ecology.

[22]  H. Tuomisto,et al.  Distribution and Diversity of Pteridophytes and Melastomataceae along Edaphic Gradients in Yasuní National Park, Ecuadorian Amazonia1 , 2002 .

[23]  J. Terborgh,et al.  A COMPARISON OF TREE SPECIES DIVERSITY IN TWO UPPER AMAZONIAN FORESTS , 2002 .

[24]  J. Plotkin,et al.  HABITAT PATTERNS IN TROPICAL RAIN FORESTS: A COMPARISON OF 105 PLOTS IN NORTHWEST BORNEO , 2002 .

[25]  Stephen P. Hubbell,et al.  Beta-Diversity in Tropical Forest Trees , 2002, Science.

[26]  Stephen P. Hubbell,et al.  Habitat associations of trees and shrubs in a 50‐ha neotropical forest plot , 2001 .

[27]  J. Terborgh,et al.  DOMINANCE AND DISTRIBUTION OF TREE SPECIES IN UPPER AMAZONIAN TERRA FIRME FORESTS , 2001 .

[28]  P. Reich,et al.  Strategy shifts in leaf physiology, structure and nutrient content between species of high‐ and low‐rainfall and high‐ and low‐nutrient habitats , 2001 .

[29]  David B. Clark,et al.  EDAPHIC FACTORS AND THE LANDSCAPE-SCALE DISTRIBUTIONS OF TROPICAL RAIN FOREST TREES , 1999 .

[30]  P. Sollins.  FACTORS INFLUENCING SPECIES COMPOSITION IN TROPICAL LOWLAND RAIN FOREST: DOES SOIL MATTER? , 1998 .

[31]  M. Swaine,et al.  Rainfall and soil fertility as factors limiting forest species distributions in Ghana , 1996 .

[32]  Joost F. Duivenvoorden,et al.  Patterns of tree species richness in rain forests of the Middle Caqueta Area, Colombia, NW Amazonia , 1996 .

[33]  H. Mooney,et al.  Seasonally Dry Tropical Forests: Drought responses of neotropical dry forest trees , 1995 .

[34]  F. Bongers,et al.  Spatial distribution of gaps along three catenas in the moist forest of Taï National Park, Ivory Coast , 1994, Journal of Tropical Ecology.

[35]  P. Legendre,et al.  Partialling out the spatial component of ecological variation , 1992 .

[36]  David B. Clark,et al.  LIFE HISTORY DIVERSITY OF CANOPY AND EMERGENT TREES IN A NEOTROPICAL RAIN FOREST , 1992 .

[37]  D. Alder,et al.  Permanent sample plot techniques for mixed tropical forest , 1992 .

[38]  A. Gentry,et al.  Changes in Plant Community Diversity and Floristic Composition on Environmental and Geographical Gradients , 1988 .

[39]  M. Swaine,et al.  Distribution and ecology of vascular plants in a tropical rain forest , 1981, Geobotany.

[40]  M. Huston.  Soil nutrients and tree species richness in Costa Rican forests , 1980 .