Concentrations and exports of solutes from surface runoff in Houzhai Karst Basin, southwest China

Yan, Junhua; Li, Jianmei; Ye, Qing; Li, Kun

doi:10.1016/j.chemgeo.2012.02.003

Cited by 30 publications

(30 citation statements)

References 42 publications

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“…However, bicarbonate is another inorganic carbon source that can be used in photosynthesis, which is absorbed through the roots. In fact, plant growth in karst habitats is almost always adversely affected by high concentrations of HCO 3 − in the range of 3 mmol·kg −1 to 10 mmol·kg −1 , and high pH values ranging from 7.4 to 8.3 [10]. In a recent study, the addition of an appropriate concentration of bicarbonate increased the biofuel production of microalgae (Scenedesmus sp.…”

Section: Introductionmentioning

confidence: 99%

“…After air drying, the substrate contained 6 mmol·kg [10,14], the concentration of NaHCO 3 in the substrate was 10 mmol·kg −1 , and the pH value was 8.1.…”

Section: Plant Materials and Substratementioning

confidence: 99%

“…As an important marginal land resource, karst landscapes occupy approximately 11.2% of the surface of the earth. Additionally, the karst landscapes in Southwestern China represent more than 30% of the total potentially available land in China [9,10]. In karst habitats, plants must tolerate stresses from high concentrations of bicarbonate, high pH, frequent arid-humid alternation, high concentrations of Ca 2+ and Mg 2+ , and phosphorus deficiencies.…”

Section: Introductionmentioning

confidence: 99%

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Biomass Production of Three Biofuel Energy Plants’ Use of a New Carbon Resource by Carbonic Anhydrase in Simulated Karst Soils: Mechanism and Capacity

Wang

Xing

et al. 2017

Energies

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Abstract:To determine whether the bicarbonate in karst limestone soil could be used as a new carbon resource for biomass production by the catalysis of carbonic anhydrase (CA), a simulative karst drought stress experiment was designed and performed. Three plants used for biofuel energy,, and Euphorbia lathyris L. (El), were grown under simulated karst drought stress. In response to drought stress, the photosynthesis of the three energy plants was inhibited, but their CA activity increased. The hypothesis was confirmed by plant physiological and stable isotope techniques. The obtained results showed that plant biomass was produced with atmospheric CO 2 as well as bicarbonate under drought stress. Bicarbonate use was proportional to the CA activity of the plants. With high CA activity over a long period, El had the highest proportional bicarbonate use compared to Ov and Bj, reaching 26.95%. Additionally, a new method is proposed for the screening of plants grown for energy in karst habitats.

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Section: Introductionmentioning

confidence: 99%

“…After air drying, the substrate contained 6 mmol·kg [10,14], the concentration of NaHCO 3 in the substrate was 10 mmol·kg −1 , and the pH value was 8.1.…”

Section: Plant Materials and Substratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biomass Production of Three Biofuel Energy Plants’ Use of a New Carbon Resource by Carbonic Anhydrase in Simulated Karst Soils: Mechanism and Capacity

Wang

Xing

et al. 2017

Energies

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“…Calcium ions at a concentration of $ 2 mM have been detected in natural water sources [51]. Therefore, in this study, calcium ions at concentrations from 0.1 mM to 2 mM are added to the feed solution containing 100 μg/L PFOS at pH¼ 7 to investigate the effect of ionic strength on PFOS rejection.…”

Section: Effect Of Ionic Strength On Pfos Rejectionmentioning

confidence: 99%

Fabrication of novel poly(m-phenylene isophthalamide) hollow fiber nanofiltration membrane for effective removal of trace amount perfluorooctane sulfonate from water

Wang

Zhao

et al. 2015

Journal of Membrane Science

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a b s t r a c tThis study investigated the separation performance of a hollow fiber nanofiltration membrane, which was fabricated from poly(m-phenylene isophthalamide) (PMIA) using a dry-jet wet spinning technology, for sustainable water recovery from water containing trace amount of perfluorooctane sulfonate (PFOS) that was a persistent organic pollutant commonly existed in water. SEM spectra indicated that the cross section of the hollow fiber membrane had an asymmetrical structure that consisted of a dense outer surface acting as a selectively layer, a spongy-like transition layer, and finger-like microvoids close to the inner surface. The average pore size and molecular weight cut-off, which were estimated using the solute rejection method, were 0.404 nm and 904 Da, respectively. The PFOS rejection experiments were carried out at the trans-membrane pressures ranging from 4 Â 10 5 Pa to 1.0 Â 10 6 Pa and PFOS concentrations from 50 μg/L to 500 μg/L. In all cases, the PFOS rejections were found to be increased as the PFOS concentration increased. The impact of the pH value and Ca 2 þ concentration of the feed solution on the PFOS rejections was studied in detail. The PFOS rejections improved from 91.17% to 97.49% with an increase in pH from 3.2 to 9.5 at 4 Â 10 5 Pa. An increase of Ca 2 þ concentration from 0.1 mM to 2 mM enhanced PFOS rejection from 97.10% to 99.40% at a trans-membrane pressure of 4 Â 10 5 Pa. The sorption/desorption experiments indicated that the amount of PFOS adsorbed on the membrane surface was five times higher in the presence of Ca 2 þ (2 mM). AFM experiments also demonstrated that the membrane surface was rough with the addition of Ca 2 þ . Hence, the presence of Ca 2 þ enhanced the PFOS adsorption in the membrane surface and caused more pore blockage of the membrane. As such, the declination in the water flux and augmentation in the PFOS rejection were observed.

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“…The most frequently used calculation method for carbon sequestration is the forward method and, in China's karst regions, the river chemistry method Zhao et al, 2010;Jiang et al, 1999). However, there are some defects in the forward method because physical models cannot truly reflect the in situ karstification and carbon migration process (Kang et al, 2011); consequently, the river chemistry method is more frequently adopted (Zhao et al, 2010;Yan et al, 2012;Zhang et al, 2015;Huang et al, 2015). There are large discrepancies in the estimates of carbon sequestration in China, ranging from 5 Tg C yr −1 (Jiang and Yuan, 1999) to 12 Tg C yr −1 and 18 Tg C yr −1 (Liu and Zhao, 2000).…”

Section: Introductionmentioning

confidence: 99%

Differences and influencing factors related to underground water carbon uptake by karsts in the Houzhai Basin, southwestern China

et al. 2016

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Abstract. Carbon sink in karstic areas is very important at a global scale. Consequently, accurate determination of the carbon sink of karst ecosystems has become a core issue in research. We used flow and carbon ion concentration data from three stations with different environmental background conditions in the Houzhai Basin, southwestern China, to analyse the differences in carbon uptake between stations and to determine their impact factors. The results show that carbon sink discharge was mainly controlled by the flow at each site. Preliminary analysis indicated that the rapid increase in flow only had a partial dilution effect on the ion concentrations due to the high speed and stability of chemical carbonate weathering. The Land-Use and Cover-Change (LUCC) type had important effects on the bicarbonate ion concentrations; under stable run-off conditions, the influence of flow variation on the ion concentration was lower than the effects of chemical carbonate weathering on bicarbonate ion concentrations under different environmental conditions (a comparison of Laoheitan and Liugu stations showed a difference of 150 %). However, if run-off increased significantly, the impact of run-off variation on bicarbonate ions was greater than the effects of chemical carbonate weathering caused under different environmental conditions. This work provides a reference for the calculation of the karst geological carbon sink.

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Concentrations and exports of solutes from surface runoff in Houzhai Karst Basin, southwest China

Cited by 30 publications

References 42 publications

Biomass Production of Three Biofuel Energy Plants’ Use of a New Carbon Resource by Carbonic Anhydrase in Simulated Karst Soils: Mechanism and Capacity

Biomass Production of Three Biofuel Energy Plants’ Use of a New Carbon Resource by Carbonic Anhydrase in Simulated Karst Soils: Mechanism and Capacity

Fabrication of novel poly(m-phenylene isophthalamide) hollow fiber nanofiltration membrane for effective removal of trace amount perfluorooctane sulfonate from water

Differences and influencing factors related to underground water carbon uptake by karsts in the Houzhai Basin, southwestern China

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