scholarly journals Agricultural acceleration of soil carbonate weathering

2020 ◽  
Vol 26 (10) ◽  
pp. 5988-6002 ◽  
Author(s):  
John H. Kim ◽  
Esteban G. Jobbágy ◽  
Daniel D. Richter ◽  
Susan E. Trumbore ◽  
Robert B. Jackson
Keyword(s):  
Carbonate Weathering ◽  
Soil Carbonate

A FLEXIBLE MONTHLY EQUILIBRIUM MODEL OF SOIL CARBONATE PRESERVATION APPLIED TO SOUTHERN UTAH

2017 ◽  
Author(s):  
Tyler E. Huth ◽  
◽  
Thure Cerling ◽  
David W. Marchetti ◽  
David R. Bowling ◽  
...  
Keyword(s):  
Equilibrium Model ◽  
Soil Carbonate

scholarly journals Contribution of carbonate weathering to the CO2 efflux from temperate forest soils

2015 ◽  
Vol 124 (1-3) ◽  
pp. 273-290 ◽  
Author(s):  
Andreas Schindlbacher ◽  
Werner Borken ◽  
Ika Djukic ◽  
Christian Brandstätter ◽  
Christoph Spötl ◽  
...  
Keyword(s):  
Forest Soils ◽  
Temperate Forest ◽  
Co2 Efflux ◽  
Carbonate Weathering ◽  
Temperate Forest Soils

scholarly journals On Correcting 14C Ages of Gastropod Shell Carbonate for Fractionation

Radiocarbon ◽  
2002 ◽  
Vol 44 (3) ◽  
pp. 755-760 ◽  
Author(s):  
Jeffrey S Pigati
Keyword(s):  
Isotopic Composition ◽  
Carbon Isotopic Composition ◽  
Iterative Approach ◽  
Shell Formation ◽  
Gastropod Shell ◽  
Carbon Isotopic ◽  
Soil Carbonate ◽  
Shell Carbonate ◽  
Atmospheric Carbon

Correcting the 14C age of a sample for fractionation is straightforward if the measured carbon was derived entirely from the atmosphere, either directly or through chemical and/or biological reactions that originated with atmospheric carbon. This correction is complicated in the case of gastropods that incorporate carbon from limestone or secondary carbonate (e.g. soil carbonate) during shell formation. The carbon isotopic composition of such gastropod shells is determined by fractionation, as well as mixing of carbon from sources with different isotopic values. Only the component of shell carbonate derived from atmospheric carbon should be corrected for fractionation. In this paper, the author derives a new expression for correcting the measured 14C activity of gastropod shells for fractionation, and describe an iterative approach that allows the corrected 14C activity and the fraction of shell carbonate derived from atmospheric carbon to be determined simultaneously.

scholarly journals Impact of different fertilizers on the carbonate weathering in a typical karst area, Southwest China: a field column experiment

2016 ◽  
Author(s):  
Chao Song ◽  
Changli Liu ◽  
Guilin Han
Keyword(s):  
Southwest China ◽  
Column Experiment ◽  
Phosphate Fertilizer ◽  
Global Scale ◽  
Karst Area ◽  
Carbonate Weathering ◽  
Nitrogenous Fertilizer ◽  
Co2 Consumption ◽  
Common Ion ◽  
Calcium Magnesium

Abstract. Carbonate weathering, as a significant vector for the movement of carbon both between and within ecosystems, are strongly influenced by anthropogenic perturbations such as agricultural fertilization. Different fertilizer may exert a different impact on carbonate weathering, but their differences are not still well-known so far. In this study, a field column experiment was employed to explore the responses of carbonate weathering to different fertilizer addition. The eleven different treatments with three replicates including control, NH4NO3, NH4HCO3, NaNO3, NH4Cl, (NH4)2CO3, Ca3(PO4)2, (NH4)3PO4, fused calcium-magnesium phosphate fertilizer (Ca-Mg-P), Urea and K2CO3 were established in this column experiment, where limestone and dolostone tablets were buried at the bottom of each to determine the weathering amount and ratio of carbonate in soil. The result showed that the addition of urea, NH4NO3, NH4HCO3, NH4Cl and (NH4)2CO3 distinctly increased carbonate weathering, which was attributed to the nitrification of NH4+, and the addition of Ca3(PO4)2, Ca-Mg-P and K2CO3 induced carbonate precipitation due to common ion effect. Whereas the (NH4)3PO4 and NaNO3 addition did not impact significantly on carbonate weathering. The results of NaNO3 treatment seem to be raising a new question: the little impact of nitrate on carbonate weathering may result in the overestimation of impact of N-fertilizer on CO2 consumption by carbonate weathering at the regional/global scale if the effect of NO3 and NH4 are not distinguished. Moreover, in order to avoid misunderstanding more or less, the statement that nitrogenous fertilizer can aid carbonate weathering should be replaced by ammonium fertilizer.

Sign in / Sign up

Export Citation Format

Share Document