Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10533-006-9067-x |
Calcium carbonate in termite galleries - biomineralization or upward transport? | |
Liu, X.; Monger, H. C.; Whitford, W. G. | |
通讯作者 | Monger, H. C. |
来源期刊 | BIOGEOCHEMISTRY
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ISSN | 0168-2563 |
出版年 | 2007 |
卷号 | 82期号:3页码:241-250 |
英文摘要 | Termites and soil calcium carbonate are major factors in the global carbon cycle: termites by their role in decomposition of organic matter and methane production, and soil calcium carbonate by its storage of atmospheric carbon dioxide. In arid and semiarid soils, these two factors potentially come together by means of biomineralization of calcium carbonate by termites. In this study, we evaluated this possibility by testing two hypotheses. Hypothesis 1 states that termites biomineralize calcium carbonate internally and use it as a cementing agent for building aboveground galleries. Hypothesis 2 states that termites transport calcium carbonate particles from subsoil horizons to aboveground termite galleries where the carbonate detritus becomes part of the gallery construction. These hypotheses were tested by using (1) field documentation that determined if carbonate-containing galleries only occurred on soils containing calcic horizons, (2) C-13/C-12 ratios, (3) X-ray diffraction, (4) petrographic thin sections, (5) scanning electron microscopy, and (6) X-ray mapping. Four study sites were evaluated: a C-4-grassland site with no calcic horizons in the underlying soil, a C-4-grassland site with calcic horizons, a C-3-shrubland site with no calcic horizons, and a C-3-shrubland site with calcic horizons. The results revealed that carbonate is not ubiquitously present in termite galleries. It only occurs in galleries if subsoil carbonate exists within a depth of 100 cm. C-13/C-12 ratios of carbonate in termite galleries typically matched C-13/C-12 ratios of subsoil carbonate. X-ray diffraction revealed that the carbonate mineralogy is calcite in all galleries, in all soils, and in the termites themselves. Thin sections, scanning electron microscopy, and X-ray mapping revealed that carbonate exists in the termite gut along with other soil particles and plant opal. Each test argued against the biomineralization hypothesis and for the upward-transport hypothesis. We conclude, therefore, that the gallery carbonate originated from upward transport and that this CaCO3 plays a less active role in short-term carbon sequestration than it would have otherwise played if it had been biomineralized directly by the termites. |
英文关键词 | atmospheric carbon dioxide arid and semiarid soils carbon isotopes carbon sequestration Chihuahuan Desert pedogenic carbonate |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000244994300003 |
WOS关键词 | CHEMICAL-PROPERTIES ; DESERT SOILS ; CALICHE ; MOUNDS |
WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
来源机构 | New Mexico State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/153648 |
作者单位 | (1)New Mexico State Univ, Dept Plant & Environm Sci, Las Cruces, NM 88003 USA;(2)USDA Agr Res Serv, Jornada Expt Range, Las Cruces, NM 88003 USA |
推荐引用方式 GB/T 7714 | Liu, X.,Monger, H. C.,Whitford, W. G.. Calcium carbonate in termite galleries - biomineralization or upward transport?[J]. New Mexico State University,2007,82(3):241-250. |
APA | Liu, X.,Monger, H. C.,&Whitford, W. G..(2007).Calcium carbonate in termite galleries - biomineralization or upward transport?.BIOGEOCHEMISTRY,82(3),241-250. |
MLA | Liu, X.,et al."Calcium carbonate in termite galleries - biomineralization or upward transport?".BIOGEOCHEMISTRY 82.3(2007):241-250. |
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