黄壤性水稻土有机碳及其组分对长期施肥的响应及其演变

doi:10.3864/j.issn.0578-1752.2017.23.012

Abstract

Abstract: 【Objective】The organic carbon of different protection mechanisms showed different fertility and bioavailability due to the difference in stability. The study of the response of soil organic carbon and its fractions in yellow paddy soils (main type of paddy soils in Guizhou province) on long-term fertilization and its evolution characteristics will provide scientific basis for the assessment of carbon sequestration potential and the improvement of soil fertility in paddy field in southwest China. 【Method】Soil samples of five fertilization treatments, including no fertilizer control (CK), chemical fertilizer (NPK), organic manure (M), low application rate of manure combined with chemical fertilizer (0.5MNPK) , and normal application rate of manure combined with chemical fertilizer (MNPK) , were collected every two years from 2006 to 2014 in the long-term fertilization experiment (starting from 1995) of yellow paddy soil in Guizhou Province, China. The content of soil total organic carbon and its four fractions organic carbon (unprotected organic carbon, physically-protected organic carbon, chemically-protected organic carbon and biochemically- protected organic carbon) were determined by Stewart physical-chemical fractionation method and elemental analyzing method. The linear regression equations were used to model the evolution characteristics of soil total organic carbon and organic carbon fractions. 【Result】The results showed that compared with CK and NPK treatments, soil total organic carbon contents under the manuring treatments (0.5MNPK/M/MNPK) were significantly increased by 15%-39%, among which MNPK treatment had the maximum increasing range, and the unprotected organic carbon, physically-protected organic carbon and chemically-protected organic carbon were significantly increased under the manuring treatments (0.5MNPK/M/MNPK). The soil organic carbon and its fractions contents in four fertilization treatments (NPK/0.5MNPK/M/MNPK) increased with time from 2006 to 2014, among which the trends of linear increase of unprotected organic carbon, physically-protected organic carbon and chemically-protected organic carbon under the manuring treatments (0.5MNPK/M/MNPK) were more obvious than NPK treatment. However, which of CK treatment had no evident change with fertilization time. The average annual growth rate and growth range of soil unprotected organic carbon, physically-protected organic carbon and chemically-protected organic carbon under manuring treatments (0.5MNPK/M/MNPK) were both higher than those of CK and NPK treatments. The average annual increasing rates of soil total organic carbon under manuring treatments (0.5MNPK/M/MNPK) were 3.5-3.7 times and 1.5-1.6 times than those of CK and NPK treatments, respectively. The ratio of unprotected organic carbon to total organic carbon (58%-63%) was 3-14 times than those of other organic carbon fractions. 【Conclusion】The unprotected organic carbon not only accounted for the largest portion in soil organic carbon, but also had the most highly sensitivity to fertilization. The normal application rate of manure combined with chemical fertilizer is an effective model for improving soil organic carbon storage.

Key words: long-term fertilization, yellow paddy soil, Stewart physical-chemical fractionation, soil organic carbon, organic carbon fractions

WANG XiaoLi, GUO Zhen, DUAN JianJun, ZHOU ZhiGang, LIU YanLing, ZHANG YaRong. The Changes of Organic Carbon and Its Fractions in Yellow Paddy Soils Under Long-Term Fertilization[J].Scientia Agricultura Sinica, 2017, 50(23): 4593-4601.

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