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| Effects of long-term phosphorus fertilization and straw incorporation on phosphorus fractions in subtropical paddy soil |
| LI Yu-yuan, YANG Rui, GAO Ru, WEI Hong-an, CHEN An-lei, LI Yong |
1、Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of
Sciences, Hunan 410125, P.R.China
2、School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Shaanxi 710055, P.R.China |
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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 farmland 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); (ii) straw incorporation and green manure (SG); (iii) 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 significantly 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 significantly (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 significant (P>0.05), our data indicate that SG may partially substitute for fertilizer P input and minimizing soil P accumulation and subsequent environmental risk in the subtropical paddy soil.
Abstract Study on soil phosphorus (P) fraction is an important aspect in probing the mechanisms of soil P accumulation in farmland 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); (ii) straw incorporation and green manure (SG); (iii) 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 significantly 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 significantly (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 significant (P>0.05), our data indicate that SG may partially substitute for fertilizer P input and minimizing soil P accumulation and subsequent environmental risk in the subtropical paddy soil.
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Received: 04 October 2013
Accepted: 11 February 2015
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| Fund: This study was financially supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-T07) and the National Natural Science Foundation of China (41171396). |
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Corresponding Authors:
LI Yu-yuan, Tel: +86-731-84615228,Mobile: 18900763994, E-mail: liyy@isa.ac.cn
E-mail: liyy@isa.ac.cn
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Cite this article:
LI Yu-yuan, YANG Rui, GAO Ru, WEI Hong-an, CHEN An-lei, LI Yong.
2015.
Effects of long-term phosphorus fertilization and straw incorporation on phosphorus fractions in subtropical paddy soil. Journal of Integrative Agriculture, 14(2): 365-373.
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