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

doi:10.1016/S2095-3119(17)61901-4

Journal of Integrative Agriculture ›› 2018, Vol. 17 ›› Issue (08): 1852-1860.DOI: 10.1016/S2095-3119(17)61901-4

收稿日期:2017-10-27 出版日期:2018-08-01 发布日期:2018-08-01

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

GAO Song-juan1, 2*, GAO Ju-sheng2, 3*, CAO Wei-dong2, 4, ZOU Chun-qin1, HUANG Jing2, 3, BAI Jin-shun2, DOU Fu-gen5

¹ College of Resources and Environmental Sciences, Center for Resources, Environment and Food Security/Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing 100193, P.R.China
² Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
³ Red Soil Experimental Station in Hengyang, Chinese Academy of Agricultural Sciences, Qiyang 426182, P.R.China
⁴ Soil and Fertilizer Institute, Qinghai Academy of Agriculture and Forestry Sciences, Qinghai University, Xining 810016, P.R.China
⁵ Texas A&M AgriLife Research Center at Beaumont, Texas 77713, USA

Received:2017-10-27 Online:2018-08-01 Published:2018-08-01
Contact: Correspondence ZOU Chun-qin, Tel: +86-10-62733539, E-mail: zcq0206@cau.edu.cn; CAO Wei-dong, Tel: +86-10-82109622, E-mail: caoweidong@caas.cn
About author:GAO Song-juan, E-mail: gaosongjuan@caas.cn; * These authors contributed equally to this study.
Supported by:
This study was supported by the earmarked fund for China Agriculture Research System (2013–2017) and the Chinese Outstanding Talents Program in Agricultural Sciences.

摘要/Abstract

摘要： Received 27 October, 2017 Accepted 11 January, 2018

Abstract:

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.

Key words:

green manure , red paddy soil , dissolved organic matter , ultraviolet-visible spectra , Fourier transform infrared spectra

. [J]. Journal of Integrative Agriculture, 2018, 17(08): 1852-1860.

GAO Song-juan, GAO Ju-sheng, CAO Wei-dong, ZOU Chun-qin, HUANG Jing, BAI Jin-shun, DOU Fu-gen. Effects of long-term green manure application on the content and structure of dissolved organic matter in red paddy soil[J]. Journal of Integrative Agriculture, 2018, 17(08): 1852-1860.

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

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