Soil particle accumulation in termite (Macrotermes bellicosus) mounds and the implications for soil particle dynamics in a tropical savanna Ultisol

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• 作者：Susumu S. Abe (1) (4)
  Takashi Kotegawa (2)
  Taisuke Onishi (3)
  Yoshinori Watanabe (4)
  Toshiyuki Wakatsuki (4)
  
• 关键词：Clay turnover ; Ecosystem engineer ; Macrotermes bellicosus ; Soil particle redistribution ; Termite mounds
• 刊名：Ecological Research
• 出版年：2012
• 出版时间：January 2012
• 年：2012
• 卷：27
• 期：1
• 页码：219-227
• 全文大小：470KB
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• 作者单位：Susumu S. Abe (1) (4)
  Takashi Kotegawa (2)
  Taisuke Onishi (3)
  Yoshinori Watanabe (4)
  Toshiyuki Wakatsuki (4)
  
  1. Inland Valley Consortium/Africa Rice Center, 01 BP 2031, Cotonou, Benin
  4. School of Agriculture, Kinki University, Nara, 631-8505, Japan
  2. Faculty of Agriculture, Kochi University, Kochi, 783-8502, Japan
  3. Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan
  

文摘

This study investigated the influence of mound-building termites on soil particle dynamics on the land surface and in soil-forming processes by examining the amount of soil particles in mound structures of Macrotermes bellicosus in a highly weathered Ultisol of tropical savanna. Soil particle turnover via the mounds was estimated using particle stock data and soil turnover data from previous studies. A 4-ha study plot with six mounds of relatively uniform shape and size was investigated. Soil mass constituting the mounds was 6,166?±?1,581?kg mound? within which the mound wall and nest body accounted for 5,002?±?1,289 and 1,164?±?293?kg, respectively. The mound wall contained a significantly larger amount of clay (252?±?9.97?g?kg?) balanced with a lower sand content (676?±?26.5?g?kg?) than in the adjacent surface (Ap1) horizon, (46.4?±?12.8?g clay kg?; 866?±?83.2?g sand kg?); the nest body had much higher clay content (559?±?51.0?g?kg?) but less sand (285?±?79.2?g?kg?) than the mound wall. As a result, the mounds of M. bellicosus accumulated clay of 2,874?±?781?kg?ha? (corresponding to 2.52% of clay stock in the Ap1 horizon) along with an estimated clay turnover rate of 169?kg?ha? year?. These findings suggest a positive feedback effect from termite mound-building activity on soil particle dynamics in tropical savanna ecosystems: M. bellicosus preferentially use subsoil material for mound construction, resulting in relocation of illuvial clay in the subsoil to the land surface where clay eluviation from the surface soil and its illuviation in the subsoil are major soil-forming processes.