Decay of cacti and carbon cycling

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Cacti contain large quantities of Ca oxalate biominerals, with C derived from atmospheric CO2. Their death releases these biominerals into the environment, which subsequently transform to calcite via a monohydrocalcite intermediate. Here, the fate of Ca oxalates released by plants in arid environments is investigated. This novel and widespread form of biomineralization has unexpected consequences on C cycling and calcite accumulation in areas with large numbers of cacti. The magnitude of this mineralization is revealed by studying the large columnar cactus Carnegiea gigantea (Engelm.) Britton and Rose in southwestern Arizona (locally called the saguaro). A large C. gigantea contains on the order of 1 × 105 g of the Ca oxalate weddellite - CaC2O4·2H 2O. In areas with high C. gigantea density, there is an estimated 40 g Catm m-2 sequestered in Ca oxalates. Following the death of the plant, the weddellite transforms to calcite on the order to 10-20 years. In areas with high saguaro density, there is an estimated release of up to 2.4 g calcite m-2 year-1 onto the desert soil. Similar transformation mechanisms occur with the Ca oxalates that are abundant in the majority of cacti. Thus, the total atmospheric C returned to the soil of areas with a high number density of cacti is large, suggesting that there may be a significant long-term accumulation of atmospheric C in these soils derived from Ca oxalate biominerals. These findings demonstrate that plant decay in arid environments may have locally significant impacts on the Ca and inorganic C cycles.

Original languageEnglish (US)
Pages (from-to)114-118
Number of pages5
JournalNaturwissenschaften
Volume93
Issue number3
DOIs
StatePublished - Mar 1 2006

Fingerprint

Cactaceae
cactus
Oxalates
oxalates
oxalate
Carnegiea gigantea
Carbon
Calcium Carbonate
deterioration
calcite
carbon
Soil
dry environmental conditions
arid environment
Soils
transform
death
Biomineralization
desert soils
desert soil

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Ecology

Cite this

Decay of cacti and carbon cycling. / Garvie, Laurence.

In: Naturwissenschaften, Vol. 93, No. 3, 01.03.2006, p. 114-118.

Research output: Contribution to journalArticle

Garvie, Laurence. / Decay of cacti and carbon cycling. In: Naturwissenschaften. 2006 ; Vol. 93, No. 3. pp. 114-118.
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