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Volume 38 Issue 1
Feb.  2019
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Article Navigation >  CARSOLOGICA SINICA  > 2019  >  38(1): 60-69
WU Zeyan, LUO Weiqun, JIANG Zhongcheng, ZHANG Cheng, HU Zhaoxin, CAO Jianhua. Effects of filter sludge and organic manure soil improvement on soil hydrochemistry and net CO2 consumption of dissolution of carbonate rocks[J]. CARSOLOGICA SINICA, 2019, 38(1): 60-69. doi: 10.11932/karst20190107
Citation: WU Zeyan, LUO Weiqun, JIANG Zhongcheng, ZHANG Cheng, HU Zhaoxin, CAO Jianhua. Effects of filter sludge and organic manure soil improvement on soil hydrochemistry and net CO2 consumption of dissolution of carbonate rocks[J]. CARSOLOGICA SINICA, 2019, 38(1): 60-69. doi: 10.11932/karst20190107
shu

Effects of filter sludge and organic manure soil improvement on soil hydrochemistry and net CO2 consumption of dissolution of carbonate rocks

doi: 10.11932/karst20190107
  • 1.

    Institute of Karst Geology,CAGS/ Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, MNR, Guilin,Guangxi 541004,China; /Institute of Karst Geology,CAGS/ Key Laboratory of Karst Dynamics,MNR＆GZAR,Guilin,Guangxi 541004,China/China University of Geosciences (Wuhan), Wuhan,Hubei 430074,China

  • 2.

    Institute of Karst Geology,CAGS/ Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, MNR, Guilin,Guangxi 541004,China;

  • 3.

    Institute of Karst Geology,CAGS/ Key Laboratory of Karst Dynamics,MNR＆GZAR,Guilin,Guangxi 541004,China

  • Publish Date: 2019-02-25
    Abstract
  • In order to find the optimal soil improvement scheme that can increase inorganic carbon sink using filter sludge and different organic fertilizer, three soil improvement schemes were designed in demonstration area,namely,Filter Sludge(LN),Filter Sludge+Straw+Biogas Slurry (LNJZ)and Filter Sludge+Straw+Cow Manure(LNJN). Standard corrosion test tablets and soil water traps were buried in each modified and controlled soil to test the one-year dissolution rates and concentrations of main anions and cations in soil water in different months.The results showed that there were a large amount of calcium salt and sulfate in the filter sludge, which had resulted in the type of soil water being Ca-SO4. The values of [Ca2+ +Mg2+]/HCO3- involved in karst process of all the modified and controlled soil water were more than 1, which indicated that exogenous acid involved in the dissolution of carbonate rocks in the soils. At the peak of fertilization, the net consumptions of CO2 in control soils were negative. The reason was that the H+ produced by nitrification and HCO3- in the water had degrassing effect,which led to the escape of CO2 from the water. Under LN scheme, organic acid in the filter sludge significantly increased the dissolution rate of the test tablets, but the pH value of soil water decreased and the massive presence of H+ led to the aggravation of degassing of HCO3- and H+ .And the average annual contribution rate of carbonate was -0.32, with an annual reduction of CO2 consumption of 0.66 mmol·L-1. Application of straw and cow manure caused serious degassing in August, and weakened the degassing effect in other months,resulting in almost unchanged annual net consumption of CO2.Applications of straw and biogas slurry greatly weakened the degassing effect caused by filter sludge, and reduced the enhancement degree of carbonate rocks dissolution rates, resulting in an increase of 0.065 mmol·L-1 of average annual net CO2 consumption.LNJZ was an optional scheme to increase inorganic carbon sink.

     

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