Scientia Agricultura Sinica ›› 2016, Vol. 49 ›› Issue (21): 4096-4106.doi: 10.3864/j.issn.0578-1752.2016.21.004

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Effects of Different Fertilization Levels on Soil Organic Matter and Dissolved Organic Matter in Two Paddy Soils After Multi-Years’ Rotation of Chinese Milk Vetch and Double-Cropping Rice

ZHOU Guo-peng1,2, CAO Wei-dong1,3, BAI Jin-shun1, NIE jun4, XU Chang-xu5, ZENG Nao-hua1, GAO Song-juan1,2, WANG Yan-qiu1,6, Shimizu Katsuyoshi7   

  1. 1Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences /Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture, Beijing 100081, China
    2Graduate School, Chinese Academy of Agricultural Sciences, Beijing 100081, China
    3Soil and Fertilizer Institute, Qinghai Academy of Agricultural and Forestry Sciences/Qinghai University, Xining 810016, China
    4Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China
    5Institute of Life Science and Technology, Inner Mongolia Normal University, Hohhot 010022, China
    6Institute of Soil & Fertilizer and Resource & Environment, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
    7Faculty of Agriculture, Kagoshima University, Kagoshima, 890-0065, Japan
  • Received:2016-04-11 Online:2016-11-01 Published:2016-11-01

Abstract: 【Objective】The objective of this study was to evaluate the integrative effects of Chinese milk vetch in corporation and its combination with different rates of fertilizer on soil fertility of paddy field in Southern China. 【Method】 Soil samples were collected from the 6-7 years’ experiments located in Hunan (purple alluvial soil, PA soil) and Jiangxi (yellow clayey soil, YC soil). Seven treatments were designed: winter fallow (CK), 100% fertilizer rate (100F), sole incorporation of milk vetch (MV), and MV combined with different rates of fertilizer (MV+40F, MV+60F, MV+80F, MV+100F). The soil organic matter (OM), dissolved organic matter (DOM) and their spectroscopy characteristics were investigated.【Result】The OM content, dissolved organic carbon (DOC) content and DOM’s fluorescence intensity were significantly higher in the PA soil than those in the YC soil, but the content of dissolved organic nitrogen (DON) and the UV-Vis absorption peaks of DOM appeared opposite trends. The OM content of MV treatment was higher than those in other treatments in both the two soils, except for MV+100F in the YC soil. Compared with 100F, MV+100F reduced the OM content in the PA soil, while increased it in the YC soil. The accumulation of OM tended to decrease with the increase of fertilizer application after the MV being incorporated. The DOC content was increased in MV+80F and MV+100F treated soil (except for MV+100F in YC soil) when compared to 100F, while the MV, MV+40F and MV+60F treatments showed different effects in the two soils. The MV treatment increased the DOC/SOC ratio in two types of soils, and the ratio was significantly lower than 100F’s in YC soil. The DOC/SOC ratio tended to increase with the increase of fertilizer application after the MV being incorporated (except for MV+100F YC soil), it showed that combination with more fertilizer would be more beneficial to activation of the soil carbon pool. The MV treatment had lower DON content than 100F (except for MV+100F YC soil), especially in the PA soil. The UV-Vis spectrometric analysis indicated that the UV-Vis absorption peak of DOM in the treatments of green manure and its combination with 40%-60% fertilizer was lower than that in 100F treatment, and the E250/E365 value decreased with the increase of fertilizer addition, it indicated that DOM had the higher molecular weight and more stable molecular structure with the increase of fertilizer application. The fluorescence spectrometric analysis indicated that the fulvic-like humic was the main component of DOM in the two types of soils. Higher fluorescence intensity of DOM than 100F was found in most treatments with MV except for MV+80F and MV+100F in the YC soil, while the humic index was reduced.【Conclusion】OM content was improved by the green manure incorporation, green manure combination with fertilizer could reduce MV’s contribution to OM. After the green manure incorporated, the activity of soil carbon pool and DOM’s humic index increased with the increase of fertilizer, and these could be the reasons why green manure combination with fertilizer reduced MV’s contribution to OM.

Key words: Astragalus sinicus, rice, chemical fertilizer, soil organic matter, dissolved organic matter, spectroscopy characteristics

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