Effects of Long-Term Organic Amendments on Soil Organic Carbon in a Paddy Field: A Case Study on Red Soil

文献类型： 外文期刊

第一作者： Huang Qing-hai

作者： Huang Qing-hai;Li Da-ming;Liu Kai-lou;Yu Xi-chu;Ye Hui-cai;Hu Hui-wen;Xu Xiao-lin;Wang Sai-lian;Zhou Li-jun;Duan Ying-hua;Zhang Wen-ju

作者机构：

关键词： long-term field experiment;organic amendments;soil organic carbon;paddy soil derived from red earth

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2014 年 13 卷 3 期

页码：

收录情况： SCI

摘要： Soil organic carbon (SOC) is one of the main carbon reservoirs in the terrestrial ecosystem. It is important to study SOC dynamics and effects of organic carbon amendments in paddy fields because of their vest expansion in south China. A study was carried out to evaluate the relationship between the SOC content and organic carbon input under various organic amendments at a long-term fertilization experiment that was established on a red soil under a double rice cropping system in 1981. The treatments included non-fertilization (CK), nitrogen-phosphorus-potassium fertilization in early rice only (NPK), green manure (Astragalus sinicus L.) in early rice only (OM1), high rate of green manure in early rice only (OM2), combined green manure in early rice and farmyard manure in late rice (OM3), combined green manure in early rice, farmyard manure in late rice and rice straw mulching in winter (OM4), combined green manure in early rice and rice straw mulching in winter (OM5). Our data showed that the SOC content was the highest under OM3 and OM4, followed by OM1, OM2 and OM5, then NPK fertilization, and the lowest under non-fertilization. However, our analyses in SOC stock indicated a significant difference between OM3 (33.9 t ha(-1)) and OM4 (31.8 t ha(-1)), but no difference between NPK fertilization (27 t ha(-1)) and non-fertilization (28.1 t ha(-1)). There was a significant linear increase in SOC over time for all treatments, and the slop of linear 'equation was greater in organic manure treatments (0.276-0.344 g kg(-1) yr(-1)) than in chemical fertilizer (0.216 g kg(-1) yr(-1)) and no fertilizer (0.127 g kg(-1) yr(-1)).

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