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Effects of long-term green manure application on the content and structure of dissolved organic matter in red paddy soil

文献类型： 外文期刊

作者： Gao Song-juan 1 ; Gao Ju-sheng 2 ; Cao Wei-dong 2 ; Zou Chun-qin 1 ; Huang Jing 2 ; Bai Jin-shun 2 ; Dou Fu-gen 5 ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Ctr Resources Environm & Food Secur, Key Lab Plant Soil Interact,Minist Educ, Beijing 100193, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Plant Nutr & Fertilizer, Minist Agr, Beijing 100081, Peoples R China

3.Chinese Acad Agr Sci, Red Soil Expt Stn Hengyang, Qiyang 426182, Peoples R China

4.Qinghai Univ, Qinghai Acad Agr & Forestry Sci, Soil & Fertilizer Inst, Xining 810016, Qinghai, Peoples R China

5.Texas A&M AgriLife Res Ctr, Beaumont, TX 77713 USA

关键词： green manure; red paddy soil; dissolved organic matter; ultraviolet-visible spectra; Fourier transform infrared spectra

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： 2018 年 17 卷 8 期

页码：

收录情况： SCI

摘要： Dissolved organic matter (DOM) plays important roles in soil biogeochemistry activity and nutrients transportation in soils, but studies regarding the long-term effects of green manures on the content and structure of DOM in red paddy soil have not been reported yet. A long-term green manure experiment established in 1982 was utilized to test the DOM contents in different treatments, and the spectral characteristics of DOM were investigated by using ultraviolet-visible (UV-Vis) spectrometry and Fourier transform infrared (FTIR) spectrometry. The experiment included four cropping systems: rice-rice-milk vetch (RRV), rice-rice-rape (RRP), rice-rice-ryegrass (RRG) and rice-rice-winter fallow (RRF), among them, milk vetch, rape, and ryegrass are popular winter green manure species in southern China. The results showed that the content of dissolved organic carbon (DOC), which is widely used to estimate the concentration of DOM, was significantly promoted after the incorporation of green manures compared with the other sampling stages. The contents of aromatic groups and the degree of humification of DOM increased in RRV and RRP, suggesting more complex compositions of the soil DOM after long-term application of milk vetch and rape. The contents of phenol, alcohol and carboxylic acid group at the mature stage of early rice were significantly higher than those at the stage of after green manures turned over, especially for the RRV treatment. The absorption ratio of FTIR indicated that winter plantation of rape increased the aromatic-C/aliphatic-C ratio, and ryegrass increased the aromatic-C/carboxyl-C ratio. In conclusion, long-term planting of milk vetch and rape as green manures increased the degree of aromaticity, humification and average molecular weight of DOM, and made the DOM more stable in red paddy soil.

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