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草业学报 ›› 2014, Vol. 23 ›› Issue (4): 262-268.DOI: 10.11686/cyxb20140432

• 研究论文 • 上一篇    下一篇

施肥对喀斯特地区植草土壤碳库管理指数及酶活性的影响

邓少虹1,林明月1,李伏生1*,苏以荣2,3,刘坤平2,3   

  1. 1.广西大学农学院,广西南宁530005
    2.中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,湖南长沙410125
    3.中国科学院环江喀斯特农业生态试验站,广西环江547100
  • 收稿日期:2013-08-22 出版日期:2014-08-20 发布日期:2014-08-20
  • 通讯作者: E-mail:zhenz@gxu.edu.cn; lpfu6@163.com
  • 作者简介:邓少虹(1989-),女,广西贵港人,硕士。E-mail:525737677@qq.com
  • 基金资助:
    国家科技支撑计划项目课题(2012BAD05B03)和中国科学院战略性先导科技专项子课题(XDA05070403)资助

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

摘要: 为了解施肥对喀斯特地区土壤有机碳积累及平衡的影响,通过田间试验,研究不同施肥处理对植草土壤活性有机碳含量、碳库管理指数及土壤酶活性(淀粉酶、蔗糖酶和脲酶)的影响。结果表明,施肥对植草土壤活性有机碳和碳库管理指数的影响显著,但是对3种土壤酶活性的影响不一致。与不施肥相比,施肥提高土壤活性有机碳和碳库管理指数,以N2PK处理提高土壤活性有机碳含量最为明显,提高幅度达到695.6%;低N(N1)处理提高土壤淀粉酶活性8.65%~13.80%,而高N(N2)处理提高土壤淀粉酶则不明显,且N2P处理降低17.94%;各施肥处理土壤蔗糖酶活性降低2.55%~26.97%;单施氮肥和N2P处理提高土壤脲酶活性87.67%~169.03%,而N1P处理降低土壤脲酶活性。研究结果可为喀斯特地区牧草科学施肥及农田固碳减排提供理论依据。

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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