Journal of Integrative Agriculture ›› 2021, Vol. 20 ›› Issue (9): 2526-2534.DOI: 10.1016/S2095-3119(20)63310-X

所属专题: 农业生态环境-肥料及施用合辑Agro-ecosystem & Environment—Fertilizer 农业生态环境-氮素合辑Agro-ecosystem & Environment—Nitrogen

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  • 收稿日期:2020-03-20 出版日期:2021-09-01 发布日期:2021-07-20

Fate of low-molecular-weight organic phosphorus compounds in the P-rich and P-poor paddy soils

LI Bao-zhen1, Anna GUNINA2, 3, Mostafa ZHRAN1, 4, Davey L. JONES5, Paul W. HILL5, HU Ya-jun1, GE Ti-da1, WU Jin-shui1, 6 
  

  1. 1 Key Laboratory of Agro-ecological Processes in Subtropical Region/Changsha Research Station for Agricultural & Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, P.R.China
    2 Department of Environmental Chemistry, University of Kassel, Nordbahnhofstrae 1a 37213, Witzenhausen, Germany
    3 Department of Soil Biology and Biochemistry, Dokuchaev Soil Science Institute, Moscow 119017, Russian Federation
    4 Soil and Water Research Department, Nuclear Research Center, Atomic Energy Authority, Abou-Zaabl 13759, Egypt
    5 School of Natural Sciences, Bangor University, Bangor, Gwynedd LL57 2UW, UK
    6 University of Chinese Academy of Sciences, Beijing 100049, P.R.China
  • Received:2020-03-20 Online:2021-09-01 Published:2021-07-20
  • Contact: Correspondence WU Jin-shui, Tel: +86-731-84615224; Fax: +86-731-84612685, E-mail: jswu@isa.ac.cn
  • About author:LI Bao-zhen, Tel: +86-731-84619736; E-mail: bzli@isa.ac.cn;
  • Supported by:
    This work was funded by the Natural Science Foundation of Hunan Province, China (2020JJ4563), the National Natural Science Foundation of China (4181101348), the Innovation Groups of Natural Science Foundation of Hunan Province (2019JJ10003), the Chinese Academy of Sciences President’s International Fellowship Initiative to Anna Gunina (2019VCC0003), and the Talented Young Scientist Program (TYSP) to Mostafa Zhran supported by the China Science and Technology Exchange Center (Egypt-19-004).

摘要:

为探究亚热带富磷(30年长期施肥稻田)和缺磷(休耕制稻田)水稻土中LMWOP的生物有效性及其转化,本研究在土壤中外源添加14C标记的腺苷、单磷酸腺苷(AMP)、二磷酸腺苷(ADP)和三磷酸腺苷(ATP),分析其吸附和矿化的差异。结果表明,富磷水稻土的碳、氮、磷含量是缺磷水稻土的2倍多。与缺磷水稻土相比,富磷水稻土的LMWOP化合物的矿化速率更快,且矿化速率随磷酸盐基团数量的增加而减小,即AMP>ADP>ATP。灭菌条件下,稻田土对腺苷类有机磷有很强吸附作用,在短时间内就达到了吸附饱和,且吸附量随磷酸盐基团数量的增加而增加,然而对腺苷的吸附作用较弱。以上结果表明,土壤吸附在短时间内对LMWOP矿化有轻微的抑制作用。总结而言,LMWOP能作为微生物的碳源,同时也增加了磷素的有效性,但是富磷水稻土中磷素积累与吸附饱和,也可能导致磷流失风险的增加。


Abstract:

Continuous application of organic fertilizers can cause accumulation of organic phosphorus (P) in soil, especially in the low-molecular-weight organic phosphorus (LMWOP) forms.  This organic P pool represents a potentially important source of P for both plants and microorganisms.  To understand the effect of long-term fertilization (30 years) (P-rich soil) vs. fallowing (P-poor soil) on the bioavailability and fate of LMWOP in subtropical paddy soils, we determined the sorption and mineralization of 14C-labeled adenosine, adenosine monophosphate (AMP), adenosine diphosphate (ADP), and adenosine triphosphate (ATP) in each soil.  The contents of carbon, nitrogen, and P in the P-rich soil were more than two times greater than those in the P-poor soil.  The mineralization rates of the LMWOP compounds were faster in the P-rich soil compared to the P-poor soil, and followed the order AMP>ADP>ATP.  Using sterilized soil, all forms of adenosine-P were strongly sorbed  to the solid phase and reached saturation in a short time, with the adsorbance increasing with the number of phosphate groups.  We concluded that the mineralization of LMWOP compounds was repressed slightly by sorption to the solid phase, but only in the short term.  Thus, LMWOP compounds serve as readily available sources of C for microorganisms, making P available for themselves as well as for the plants.  However, P accumulation and the progressive saturation of the P sorption sites in highly fertile soils may increase the potential risk of P runoff. 

Key words: rice paddy ,  phosphatase ,  phosphorus cycling ,  microbial community