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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (4): 262-268.DOI: 10.11686/cyxb20140432

• Orginal Article • Previous Articles     Next Articles

Effects of fertilization on soil carbon pool management index and enzyme activities in pasture grown soil of the Karst region

DENG Shao-hong1,LIN Ming-yue1,LI Fu-sheng1,SU Yi-rong2,3,LIU Kun-ping2,3   

  1. 1.College of Agriculture,Guangxi University,Nanning 530005,China;
    2.Key Laboratory of Processes of Agro-eco-system,Institute of Subtropical Agriculture,the Chinese Academy of Sciences,Changsha 410125,China;
    3.Huanjiang Station of Karst Eco-system,the Chinese Academy of Sciences,Huanjiang 547100,China
  • Received:2013-08-22 Online:2014-08-20 Published:2014-08-20

Abstract: To understand the effect of fertilization on accumulation and balance of soil organic carbon in the Karst region,the effects of different fertilization treatments on the labile organic carbon content,carbon management index and enzyme activities (amylase,invertase and urease) in pasture grown soil were investigated in a field experiment. Fertilization had significant effects on the labile organic carbon and carbon management index,but affected the activities of three enzymes in the soil differently. Compared to no fertilization,soil labile organic carbon and carbon management index were increased under fertilization,and soil labile organic carbon content increased (695.6%) significantly under the N2PK treatment. Soil amylase activities were increased by 8.65%-13.80% under low N treatment,but not obviously different under high N treatment. They were reduced by 17.94% under the N2P treatment. Soil invertase activities were decreased by 2.55%-26.97% under fertilization treatments. Soil urease activities were increased by 87.67%-169.03% under N only and N2P treatments,but decreased under the N1P treatment. The results provide a theoretical basis for scientific fertilization and the reduction of farmland carbon emission in the Karst region.

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