Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (5): 961-969.doi: 10.3864/j.issn.0578-1752.2013.05.011

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Dissolved Organic Matter (DOM) Properties in Different Aggregates Structure and Their Responses to Organic Amendments

 LIU  Man-Qiang, CHEN  Xiao-Yun, QIN  Jiang-Tao, HUANG  Qian-Ru, YU  Xi-Chu, LI  Hui-Xin, HU  Feng   

  1. 1.Soil Ecology Laboratory, College of Resources and Environmental Sciences, Nanjing Agriculture University, Nanjing 210095 2.Institute of Soil Science, Chinese Academy of Sciences/State Key Laboratory of Soil and Sustainable Agriculture, Nanjing 210008 3.Jiangxi Institute of Red Soil, Nanchang 331717
  • Received:2012-12-01 Online:2013-03-01 Published:2012-12-01

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Abstract: 【Objective】 The interactions between dissolved organic matter (DOM) and aggregate structure were investigated with soil after organic and inorganic amendments. This study would not only help optimize fertilization managements but also provide mechanistic understanding of organic carbon stabilization. 【Method】 Soil samples were collected from long-term rice paddy field including fertilization treatments of the quantity, quality and the time of organic amendments. The DOM solution located in various aggregate structure was obtained by wet-sieving physical fractionation method, and carbohydrate (CHC) and phenolics (PEC) were determined as DOM properties. 【Result】 Compared to free fractions and original microaggregates, higher CHC (163.8 mg C•kg-1) and PEC (38.6 mg C•kg-1) as well as CHC/PEC ratio (4.27) were observed in the position of inter-microaggregates in macroaggregates. Regardless of aggregate structure, organic amendments increased the CHC and PEC concentrations by 10.3% and 6.3% than that of treatment with only chemical fertilizer, respectively. But the position of inter-microaggregates in macroaggregate showed more sensitive to organic amendments than other positions. Based on the extent of protection exerted by aggregate structure, the contents and proportions of CHC and PEC protected by macroaggregates were the highest, while those in free microaggregates outside of macroaggregates were the lowest. 【Conclusion】 Spatial heterogeneity of DOM distribution demonstrated DOM preferred accumulation at inter-microaggregates of macroaggregates, which have a great significance in respect to macroaggregate stability and the formation of interior microaggregate. Organic amendments increased CHC and PEC and modified their ratio. Combining aggregate and DOM fractionation would help understand the physical mechanism of organic carbon stabilization as well as the impacts of agricultural managements.

Key words: aggregates , physical protection , dissolved organic matter , organic amendments , carbohydrate , phenolics

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