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应用生态学报 ›› 2020, Vol. 31 ›› Issue (7): 2373-2380.doi: 10.13287/j.1001-9332.202007.021

• 研究论文 • 上一篇    下一篇

有机物料还田对双季稻田土壤有机碳及其活性组分的影响

魏夏新1,2, 熊俊芬1*, 李涛2, 文炯3, 曾希柏2, 余德海1   

  1. 1云南农业大学资源与环境学院, 昆明 650100;
    2中国农业科学院农业环境与可持续发展研究所, 北京 100081;
    3国家农业环境岳阳观测实验站, 湖南岳阳 414109
  • 收稿日期:2019-11-21 接受日期:2020-04-24 出版日期:2020-07-15 发布日期:2021-01-15
  • 通讯作者: E-mail: 512419399@qq.com
  • 作者简介:魏夏新, 男, 1994年生, 硕士研究生。主要从事土壤培肥研究。E-mail: 465444750@qq.com
  • 基金资助:
    国家重点研发计划项目(2016YFD0300902)资助

Effects of different organic amendments on soil organic carbon and its labile fractions in the paddy soil of a double rice cropping system

WEI Xia-xin1,2, XIONG Jun-fen1*, LI Tao2, WEN Jiong3, ZENG Xi-bai2, YU De-hai1   

  1. 1College of Resources and Environment, Yunnan Agricultural University, Kunming 650100, China;
    2Institute of Agricultural Environment and Sustainable Deve-lopment, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    3National Agricultural Environment Yueyang Observation Experimental Station, Yueyang 414109, Hunan, China
  • Received:2019-11-21 Accepted:2020-04-24 Online:2020-07-15 Published:2021-01-15
  • Contact: E-mail: 512419399@qq.com
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2016YFD0300902).

摘要: 有机物料还田是提升农田土壤有机碳、培肥土壤的重要措施。为探讨不同有机物料的还田效果,采用室外培养方法,研究了在等碳输入条件下,施用水稻秸秆、紫云英、生物有机肥、猪粪和水稻秸秆生物炭对洞庭湖双季稻区潮土有机碳和活性有机碳组分含量的影响。结果表明: 经过180 d的培养试验,与不施用有机物料相比,施用有机物料提高了土壤活性有机碳含量。生物有机肥、猪粪和水稻秸秆生物炭处理分别使土壤有机碳含量显著提升了26.1%、9.7%和30.7%,水稻秸秆和紫云英对土壤有机碳含量的提升效应在试验期间并不显著。水稻秸秆和紫云英还田更有利于土壤可溶性有机碳和微生物生物量碳的积累,猪粪更有利于土壤可溶性有机碳的积累,生物有机肥更有利于土壤微生物生物量碳和易氧化有机碳的积累,水稻秸秆生物炭则更有利于土壤微生物生物量碳和轻组有机碳的积累。与水稻秸秆还田相比,紫云英、生物有机肥、猪粪和水稻秸秆生物炭还田使土壤碳库管理指数分别提高了31.8%、111.6%、62.2%和50.7%。从土壤固碳和土壤碳库管理指数来看,生物有机肥、猪粪和水稻秸秆生物炭的还田效果优于水稻秸秆和紫云英还田。

关键词: 有机物料, 稻田土壤, 土壤有机碳, 活性有机碳组分, 土壤碳库管理指数

Abstract: Application of organic amendments is an effective approach for improving soil organic carbon and soil fertility. To investigate the effects of different organic amendments on soil organic carbon and its labile fraction content, a batch of incubation experiments was conducted on the fluvo-aquic soil in Dongting Lake region, Hunan Province. There were six treatments, including soil amended with rice straw, soil amended with Chinese milk vetch, soil amended with bio-organic fertilizer, soil amended with pig manure, and soil amended with rice straw-derived biochar, with unamended soil as control. Each treatment had the same amount of carbon input. After 180 days of incubation, application of organic amendments increased soil labile organic carbon content. Application of bio-organic fertilizer, pig manure and rice straw-derived biochar significantly increased soil organic carbon content by 26.1%, 9.7% and 30.7%, respectively. There was no significant change in soil organic carbon content in rice straw and Chinese milk vetch treatments which were more favourable to the accumulation of soil dissolved organic carbon and microbial biomass carbon. Pig manure was more favourable to the accumulation of soil dissolved organic carbon. Bio-organic fertili-zer could benefit the accumulation of soil microbial biomass carbon and readily oxidizable organic carbon. Rice straw-derived biochar could promote the accumulation of soil microbial biomass carbon and light fraction organic carbon. Compared with rice straw, soil carbon pool management index was increased by 31.8%, 111.6%, 62.2% and 50.7% in Chinese milk vetch, bio-organic fertilizer, pig manure and rice straw-derived biochar treatments, respectively. The performance of bio-organic fertilizer, pig manure, and rice straw biochar was better than rice straw and Chinese milk vetch from the perspective of soil carbon sequestration and soil carbon pool management index.

Key words: organic amendment, paddy soil, soil organic carbon, soil labile organic carbon fractions, soil carbon pool management index