JEQ Journal of Natural Resources and Life Sciences Education
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Published online 2 February 2006
Published in J Environ Qual 35:490-494 (2006)
DOI: 10.2134/jeq2005.0276
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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TECHNICAL REPORTS

Plant and Environment Interactions

Does Calcite Encrustation in Chara Provide a Phosphorus Nutrient Sink?

Kian Siong* and Takashi Asaeda

Department of Environmental Science and Human Engineering, Saitama University, 255 Shimo-okubo, Sakura-Ku, Saitama 338-8570, Japan

* Corresponding author (03D5052{at}post.saitama-u.ac.jp, siongk{at}gmail.com)

Received for publication July 17, 2005. We studied the effect of calcite encrustation in stoneworts (Chara spp.) on P cycling in an aquatic ecosystem. Sequential fractionation was performed to quantify P fractions of the internodes of calcified (Ca-CF) and uncalcified (UCa-CF) Chara fibrosa Agardh ex Bruzelius. Our results showed that Ca-CF was able to store more P and about 14 to 23% of total P in Ca-CF was co-precipitated with encrusted calcite, while only 2 to 3% was found in UCa-CF. Furthermore, in Ca-CF, an increased amount of total P did not result in a higher release of bioavailable water-soluble and sodium hydroxide–extractable P. Extracellular calcification in Chara enhanced nutrient sink for P, provided a further bottom-up control of phytoplankton, and should be regarded as a positive feedback in stabilizing Chara dominance in lakes.

Abbreviations: AFDW, ash-free dry weight • Ca-CF, calcified Chara fibrosa Agardh ex Bruzelius • DOC, dissolved organic carbon • LOI, loss on ignition • SRP, soluble reactive phosphorus • TDP, total dissolved phosphorus • TOC, total organic carbon • TP, total phosphorus • UCa-CF, uncalcified Chara fibrosa Agardh ex Bruzelius






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