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首页> 中文期刊> 《农业科学学报（英文版）》 >Effects of long-term phosphorus fertilization and straw incorporation on phosphorus fractions in subtropical paddy soil

Effects of long-term phosphorus fertilization and straw incorporation on phosphorus fractions in subtropical paddy soil

         
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摘要

Study on soil phosphorus (P) fraction is an important aspect in probing the mechanisms of soil P accumulation in farm-land and mitigating its losing risk to the environment. We used a sequential extraction method to evaluate the impacts of long-term fertilization and straw incorporation on inorganic, organic, and residual P (Pi, Po, and Pre) fractions in the plow layer (0–20 cm) of acidic paddy soil in southern China. The experiment comprised of six treatments:(i) no fertilizer control (CK); (i ) straw incorporation and green manure (SG); (i i) nitrogen and P fertilizer (NP); (iv) NP+SG; (v) NP+K fertilizer (NPK);and (vi) NPK+SG. The results showed that, compared to the initial total soil P content (TSP, 600 mg kg–1 in 1990), long-term (20 years) combined continuous P fertilizer and SG signiifcantly increased P accumulation (by 13–20%) while single fertilization (39.3 kg P ha–1 yr–1) could maintain soil P status at the most. The average soil P fractions comprised of extractable Pi, Po, and Pre by 51.7, 33.4, and 14.9%in total soil P, respectively. With comparison of no fertilizer addition (CK), long-term single fertilization signiifcantly (P<0.05) increased the accumulation of NaHCO3–, NaOH–, and HCl–extractable Pi fractions accounting for two-to three-fold, while SG increased the accumulation of NaHCO3–and NaOH–extractable Pi and Po accounting for 12–60%. Though the mobilization of Pre fractions was not signiifcant (P>0.05), our data indicate that SG may partial y substitute for fertilizer P input and minimizing soil P accumulation and subsequent environmental risk in the subtropical paddy soil.

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  • 来源
    《农业科学学报（英文版）》 |2015年第2期|365-373|共9页
  • 作者

    LI Yu-yuan; YANG Rui; GAO Ru; WEI Hong-an; CHEN An-lei; LI Yong;

  • 作者单位

    Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, P.R.China;

    Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, P.R.China;

    Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, P.R.China;

    Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, P.R.China;

    Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, P.R.China;

    Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, P.R.China;

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