Variations in aboveground vegetation structure along a nutrient availability gradient in the Brazilian pantanal

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• 作者：George L Vourlitis (1)
  Francisco de Almeida Lobo (2)
  Osvaldo Borges Pinto Jr. (3)
  Anthony Zappia (1)
  Higo J Dalmagro (3)
  Paulo Henrique Zanella de Arruda (3)
  Jose de Souza Nogueira (3)
  
  1. Department of Biological Sciences ; California State University ; San Marcos ; CA ; 92096 ; USA
  2. Faculdade de Agronomia ; Medicina Veterin谩ria e Zootecnia Departamento de Solos e Engenharia Rural ; Universidade Federal de Mato Grosso ; Mato Grosso ; Brazil
  3. Programa de P贸s-Gradua莽茫o em F铆sica Ambiental 鈥?PGFA ; Instituto de F铆sica ; Universidade Federal de Mato Grosso ; Mato Grosso ; Brazil
  
• 关键词：Cerrado ; Hyperseasonal savanna ; Nutrient availability ; Nutrient limitation ; Plant ; soil relationships ; Tropical wetlands
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：389
• 期：1-2
• 页码：307-321
• 全文大小：887 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

Background and aims Forest expansion into seasonally flooded (hyperseasonal) savanna of the Brazilian Pantanal has been occurring for decades. Our goal was to evaluate how ecosystem physiognomy varied across a nutrient availability gradient and if hyperseasonal savanna had adequate nutrient stocks to support forest expansion. Methods We quantified soil properties, aboveground ecosystem structure, and nutrient stocks of three savanna and three forest stands in the Pantanal of Mato Grosso, Brazil, and used correlation analysis to assess how aboveground vegetation structure varied across a soil nutrient availability gradient. Results Wood and foliage carbon storage and leaf area index were positively correlated with soil extractable phosphorus (P), calcium (Ca2+), and magnesium (Mg2+) concentrations but not soil organic matter or texture. Soil profiles indicated that vegetation enriched surface P and K+ availability but not Ca2+ and Mg2+. Savanna ecosystems had adequate K+, Ca2+, and Mg2+ to support gallery and riparian forests but not palm forest, while the savanna P stock was inadequate to support forest expansion. Conclusions Hyperseasonal savanna has adequate nutrients (except P) to support forest expansion. Forest trees likely invade P-deficient savanna by surviving in P-rich microsites. Over time, biotic enrichment of soil may accelerate forest expansion into P-poor savanna.