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应用生态学报 ›› 2019, Vol. 30 ›› Issue (4): 1135-1142.doi: 10.13287/j.1001-9332.201904.033

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双季稻田冬季种植模式对土壤有机碳和碳库管理指数的影响

龙攀, 苏姗, 黄亚男, 李超, 肖志祥, 祝志娟, 刘莉, 傅志强*   

  1. 湖南农业大学农学院, 长沙 410128
  • 收稿日期:2019-01-11 出版日期:2019-04-20 发布日期:2019-04-20
  • 通讯作者: * E-mail: zqf_cis@126.com
  • 作者简介:龙 攀,女,1985年生,讲师. 主要从事稻田种植制度和水稻栽培研究. E-mail: longpan_lp@126.com
  • 基金资助:
    本文由国家自然科学基金项目(31501277)、国家重点研发计划项目(2017YFD0300410)和湖南农业大学自然科学基金项目(15QN13)资助

Effects of winter cropping mode on soil organic carbon and carbon management index of double rice paddy

LONG Pan, SU Shan, HUANG Ya-nan, LI Chao, XIAO Zhi-xiang, ZHU Zhi-juan, LIU Li, FU Zhi-qiang*   

  1. College of Agronomy, Hunan Agricultural University, Changsha 410128, China
  • Received:2019-01-11 Online:2019-04-20 Published:2019-04-20
  • Contact: * E-mail: zqf_cis@126.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (31501277), National Key Research and Development Program of China (2017YFD0300410), and Natural Science Foundation of Hunan Agricultural University (15QN13).

摘要: 为探讨冬季覆盖作物还田对稻田土壤碳库的影响,通过冬季种植油菜、紫云英、黑麦草、马铃薯,并以冬闲为对照进行大田试验,测定了不同冬季作物模式下早稻和晚稻的土壤有机碳、活性有机碳含量,并计算了稳态碳、碳库活度、活度指数、碳库指数和土壤碳库管理指数.结果表明:冬季作物还田增加了土壤有机碳含量,早稻和晚稻后的土壤有机碳含量比对照分别提高了1%~8%和3%~18%;油菜、黑麦草和紫云英还田均促进了土壤活性有机碳含量的增加,早稻后增加16.2%~84.2%,晚稻后增加24.4%~28.1%;冬季作物还田增加了土壤碳库管理指数,增加幅度为1.4%~41.8%.综上所述,冬种作物还田有利于提高土壤的固碳效应,并提升土壤质量,以种植黑麦草、紫云英的综合效果较佳.

关键词: 碳库管理指数, 双季稻, 冬季, 种植模式, 活性有机碳, 土壤有机碳

Abstract: To explore the effects of winter crops recycling into paddy field on soil carbon pool, we cultivated rape, Chinese milk vetch, ryegrass and potato in winter season after harvesting double-season rice, with fallow as control (CK). The contents of soil organic carbon (SOC) and labile organic carbon (LOC) in the harvest of early and late rice were measured, and the stable carbon, activity of carbon pool, carbon pool index, carbon pool activity index and carbon pool management index (CMI) were calculated. Results showed that winter cover crops returning increased SOC content by 1%-8% and 3%-18% after harvest of early rice and late rice, respectively in comparison with CK. Cultivating rape, Chinese milk vetch and ryegrass all increased the LOC content, with enhancement of 16.2%-84.2% and 24.4%-28.1% after harvest of early rice and late rice, respectively. The CMI of all winter crop treatments presented a growth ratio of 1.4%-41.8% compared to CK. In conclusion, the cultivation of winter crop and recycling to field promoted soil carbon fixation and soil quality, among which the ryegrass and Chinese milk vetch showed better comprehensive effect.

Key words: double rice, cropping mode, soil organic carbon, labile organic carbon, winter, carbon pool management index