The effects of agricultural activities and atmospheric acid deposition on carbonate weathering in a small karstic agricultural catchment, Southwest China
In order to quantify the sources and fluxes of DIC, the effects of the use of N-fertilizers and acid deposition on carbonate weathering have been quantified by hydrochemistry and δ13CDIC of groundwater in Qingmuguan underground river system (QURS) – a small karstic agricultural catchment of Southwes...
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ftslacadscienart:oai:ojs.zrc-sazu.si:article/4507 2024-09-15T18:01:41+00:00 The effects of agricultural activities and atmospheric acid deposition on carbonate weathering in a small karstic agricultural catchment, Southwest China Chen, Yu Jiang, Yongjun 2016-11-30 application/pdf https://ojs.zrc-sazu.si/carsologica/article/view/4507/4395 https://ojs.zrc-sazu.si/carsologica/article/view/4507 eng eng ZRC SAZU, Založba ZRC https://ojs.zrc-sazu.si/carsologica/article/view/4507 Acta Carsologica; Vol. 45 No. 2 (2016) Acta Carsologica; Letn. 45 Št. 2 (2016) 1580-2612 0583-6050 carbonate weathering karst groundwater agricultural activities atmospheric acid deposition Qingmuguan Southwest China info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Original papers 2016 ftslacadscienart 2024-08-05T03:05:17Z In order to quantify the sources and fluxes of DIC, the effects of the use of N-fertilizers and acid deposition on carbonate weathering have been quantified by hydrochemistry and δ13CDIC of groundwater in Qingmuguan underground river system (QURS) – a small karstic agricultural catchment of Southwest China. The results show that: (1) the significant temporal variations for major element concentrations and δ13CDIC of groundwater in different months were observed, especially, of which the groundwater showed significant high concentrations of DIC, Ca2+, Mg2+, NO3−, SO42− and δ13CDIC in rainy season and fertilizing period in the QURS; (2) the contributions of carbonate dissolution by carbonic acid to total concentrations of (Ca2++Mg2+) and HCO3− of groundwater in different months averaged 68.5 % and 81.0 %, respectively. While the contributions of carbonate dissolution by nitric acid originated from the use of N-fertilizers and atmospheric acid deposition to total concentrations of (Ca2++Mg2+) and HCO3− of groundwater in different months averaged 11.1 % and 6.7 %, respectively, and the contributions of carbonate dissolution by sulphuric acid originated from the atmospheric acid deposition to total concentrations of (Ca2++Mg2+) and HCO3− of groundwater in different months averaged 20.4 % and 12.3 %, respectively; (3) the δ13CDIC increased obviously with (Ca2++Mg2+)/HCO3− of groundwater in the rainy season and fertilizing period indicated that the use of N-fertilizers and atmospheric acid deposition should be responsible for the elevated the δ13CDIC and the molar ratio of (Ca2++Mg2+)/HCO3− of groundwater in the QURS.Key words: carbonate weathering, karst groundwater, agricultural activities, atmospheric acid deposition, Qingmuguan, Southwest China. Article in Journal/Newspaper Carbonic acid ZRC SAZU Publishing (Znanstvenoraziskovalni center - Slovenske akademije znanosti in umetnosti) Acta Carsologica 45 2 |
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ZRC SAZU Publishing (Znanstvenoraziskovalni center - Slovenske akademije znanosti in umetnosti) |
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ftslacadscienart |
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English |
topic |
carbonate weathering karst groundwater agricultural activities atmospheric acid deposition Qingmuguan Southwest China |
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carbonate weathering karst groundwater agricultural activities atmospheric acid deposition Qingmuguan Southwest China Chen, Yu Jiang, Yongjun The effects of agricultural activities and atmospheric acid deposition on carbonate weathering in a small karstic agricultural catchment, Southwest China |
topic_facet |
carbonate weathering karst groundwater agricultural activities atmospheric acid deposition Qingmuguan Southwest China |
description |
In order to quantify the sources and fluxes of DIC, the effects of the use of N-fertilizers and acid deposition on carbonate weathering have been quantified by hydrochemistry and δ13CDIC of groundwater in Qingmuguan underground river system (QURS) – a small karstic agricultural catchment of Southwest China. The results show that: (1) the significant temporal variations for major element concentrations and δ13CDIC of groundwater in different months were observed, especially, of which the groundwater showed significant high concentrations of DIC, Ca2+, Mg2+, NO3−, SO42− and δ13CDIC in rainy season and fertilizing period in the QURS; (2) the contributions of carbonate dissolution by carbonic acid to total concentrations of (Ca2++Mg2+) and HCO3− of groundwater in different months averaged 68.5 % and 81.0 %, respectively. While the contributions of carbonate dissolution by nitric acid originated from the use of N-fertilizers and atmospheric acid deposition to total concentrations of (Ca2++Mg2+) and HCO3− of groundwater in different months averaged 11.1 % and 6.7 %, respectively, and the contributions of carbonate dissolution by sulphuric acid originated from the atmospheric acid deposition to total concentrations of (Ca2++Mg2+) and HCO3− of groundwater in different months averaged 20.4 % and 12.3 %, respectively; (3) the δ13CDIC increased obviously with (Ca2++Mg2+)/HCO3− of groundwater in the rainy season and fertilizing period indicated that the use of N-fertilizers and atmospheric acid deposition should be responsible for the elevated the δ13CDIC and the molar ratio of (Ca2++Mg2+)/HCO3− of groundwater in the QURS.Key words: carbonate weathering, karst groundwater, agricultural activities, atmospheric acid deposition, Qingmuguan, Southwest China. |
format |
Article in Journal/Newspaper |
author |
Chen, Yu Jiang, Yongjun |
author_facet |
Chen, Yu Jiang, Yongjun |
author_sort |
Chen, Yu |
title |
The effects of agricultural activities and atmospheric acid deposition on carbonate weathering in a small karstic agricultural catchment, Southwest China |
title_short |
The effects of agricultural activities and atmospheric acid deposition on carbonate weathering in a small karstic agricultural catchment, Southwest China |
title_full |
The effects of agricultural activities and atmospheric acid deposition on carbonate weathering in a small karstic agricultural catchment, Southwest China |
title_fullStr |
The effects of agricultural activities and atmospheric acid deposition on carbonate weathering in a small karstic agricultural catchment, Southwest China |
title_full_unstemmed |
The effects of agricultural activities and atmospheric acid deposition on carbonate weathering in a small karstic agricultural catchment, Southwest China |
title_sort |
effects of agricultural activities and atmospheric acid deposition on carbonate weathering in a small karstic agricultural catchment, southwest china |
publisher |
ZRC SAZU, Založba ZRC |
publishDate |
2016 |
url |
https://ojs.zrc-sazu.si/carsologica/article/view/4507/4395 https://ojs.zrc-sazu.si/carsologica/article/view/4507 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Acta Carsologica; Vol. 45 No. 2 (2016) Acta Carsologica; Letn. 45 Št. 2 (2016) 1580-2612 0583-6050 |
op_relation |
https://ojs.zrc-sazu.si/carsologica/article/view/4507 |
container_title |
Acta Carsologica |
container_volume |
45 |
container_issue |
2 |
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1810438776627920896 |