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Long-term fertilization effects on carbon and nitrogen in particle-size fractions of a Chinese Mollisol

文献类型： 外文期刊

作者： Yan, Y. 1 ; He, H. 1 ; Zhang, X. 1 ; Chen, Y. 1 ; Xie, H. 1 ; Bai, Z. 1 ; Zhu, P. 5 ; Ren, J. 5 ; Wang, L. 5 ;

作者机构： 1.Chinese Acad Sci, Inst Appl Ecol, Key Lab Terr Ecol Proc, Shenyang 110016, Peoples R China

2.Shenyang Agr Univ, Coll Soil & Environm, Shenyang 110161, Peoples R China

3.Natl Field Res Stn Shenyang Agroecosyst, Shenyang 110016, Peoples R China

4.Liaoning Rice Res Inst, Shenyang 110101, Peoples R China

5.Jilin Acad Agr Sci, Gongzhuling 136100, Peoples R China

关键词： Long-term fertilization;soil organic carbon;nitrogen;particle-size fractions;Chinese Mollisol

期刊名称：CANADIAN JOURNAL OF SOIL SCIENCE （ 影响因子：1.522； 五年影响因子：1.805 ）

ISSN： 0008-4271

年卷期： 2012 年 92 卷 3 期

页码：

收录情况： SCI

摘要： Yan, Y., He, H., Zhang, X., Chen, Y., Xic, H., Bai, Z., Zhu, P., Ren, J. and Wang, L. 2012. Long-term fertilization effects on carbon and nitrogen in particle-size fractions of a Chinese Mollisol. Can. J. Soil Sci. 92: 509-519. The response of soil organic matter (SOM) dynamics to long-term fertilization may be deduced from changes in the accumulation and distribution of different soil organic carbon (SOC) and nitrogen (N) pools. The SOC and N in particle-size fractions were therefore measured to assess the influences of pig manure and synthetic fertilizer application on the characteristics of these pools. A long-term fertilization experiment, established in 1979 in the Mollisol area (Gongzhuling, China) was used for this study. Composite soil samples (0-20 cm) were collected in 2005 from 12 treatment plots that had received annual applications of pig manure, synthetic fertilizers or combinations of both. Soils were fractionated into fine clay (<0.2 mu m), coarse clay (0.2-2 mu m), silt (2-50 mu m), fine sand (50-250 mu m) and coarse sand (250-2000 mu m) and then SOC and N contents in each particle-size fraction were measured. Although most of the SOC and N were associated with clay and silt fractions, the large proportion of silt in the soil mass played a key role in the retention of SOC and N. The application of pig manure alone increased accumulation of SOC and N in each particle-size fraction, but preferential enrichment was found in the coarse sand fraction. This indicates that pig manure is efficient in restoring SOM in the temperate Chinese Mollisol under a tilled maize (Zea mays L.) monocropping system and having a long frozen period in winter. The application of synthetic fertilizers had no clear effect on SOC and N accumulation or their distribution in particle-size fractions. However, the combined application of pig manure and synthetic fertilizers enhanced the accumulation of SOC and N in all particle-size fractions, and led to a shift of SOC and N from fine to coarse particles. We extended the hierarchy model for SOC protection to consider a shift in SOC accumulation from fine to coarse particles, depending on the initial SOC content of the specific soil. The findings reveal a clear positive interaction between pig manure and synthetic fertilizers that may improve the quantity of SOM in the temperate Chinese Mollisol.

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