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Journal of Agriculture ›› 2025, Vol. 15 ›› Issue (3): 51-59.doi: 10.11923/j.issn.2095-4050.cjas2023-0272

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Effects of Combined Application of Different Organic Materials and Clay Minerals on Accumulation of Organic Carbon in Newly Cultivated Paddy Soils

YIN Xianyuan1(), ZHANG Xin1, XU Qiutong2, ZHANG Mingkui2()   

  1. 1 Beautiful Rural Construction Center of Quzhou, Quzhou Zhejiang 324003
    2 College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058
  • Received:2023-12-04 Revised:2024-03-14 Online:2025-03-20 Published:2025-03-18

Abstract:

To understand the effects of combined application of organic materials with different sources and clay minerals on the improvement of soil organic matter in newly reclaimed paddy fields, two newly reclaimed red soil paddy fields with different textures, including paddy fields on red sandstone soil and paddy field on yellowish red soil in Zhejiang Province, were selected to explore the mineralization characteristics of different organic materials in newly reclaimed red soil paddy fields by indoor simulation cultivation. The effects of different organic material combination application on soil organic carbon accumulation and composition, as well as the effects of organic materials-clay mineral combination application on organic carbon accumulation in the soils were analyzed. The results showed that the mineralization rate of different organic materials in the soils was different. The application of biochar, weathered coal humic acid, peat and branch compost was conducive to the accumulation of soil organic carbon, and the application of biological manure was conducive to improving soil microbial biomass. The combination of biochar-weathered coal-biological manure, biochar-branch compost-biological manure or peat-straw-biological manure was better for improvement of soil organic carbon. The study on the effects of organic material combinations in different proportions on the accumulation of organic carbon in the soils showed that three proportioning schemes, namely, biochar (2/5)+weathered coal humic acid (1/5)+biological manure (2/5), biochar (2/5)+ branch compost (1/5)+biological manure (2/5), and peat (2/5)+straw (1/5)+biological manure (2/5), were more appropriate for the overall improvement of soil organic carbon quality in new paddy fields. At the same time of applying organic materials, the application of montmorillonite in new sandy loamy paddy field was conducive to the improvement of soil water stability aggregates, and could promote the joint improvement of organic carbon and microbial biomass carbon, and increase the stability of soil organic carbon.

Key words: newly cultivated paddy fields, quantity and quality of organic carbon, improvement, organic materials, clay minerals, soil aggregates, stability, microbial biomass