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草业学报 ›› 2025, Vol. 34 ›› Issue (9): 53-64.DOI: 10.11686/cyxb2024415

• 研究论文 • 上一篇    下一篇

长期不同果园生草覆盖下土壤碳矿化及其温度敏感性研究

陈俊玲2,3(), 王莎莎2,3, 叶菁1,3, 林怡1,3, 王义祥1,3()   

  1. 1.福建省农业科学院资源环境与土壤肥料研究所,福建 福州 350013
    2.福建农林大学资源与环境学院,福建 福州 350002
    3.福建省红壤山地农业生态过程重点实验室,福建 福州 350003
  • 收稿日期:2024-10-22 修回日期:2024-12-16 出版日期:2025-09-20 发布日期:2025-07-02
  • 通讯作者: 王义祥
  • 作者简介:E-mail: sd_wolong@163.com
    陈俊玲(2001-),女,贵州毕节人,在读硕士。E-mail: 13027267589@163.com
  • 基金资助:
    中央引导地方科技发展专项(2023L3022);福建省自然科学基金(2023J01191);福建省农业科学院协同创新工程项目(XTCXGC2021010)

Soil carbon mineralization in an orchard with and without interplanted ground cover species and its temperature sensitivity under long-term conditions

Jun-ling CHEN2,3(), Sha-sha WANG2,3, Jing YE1,3, Yi LIN1,3, Yi-xiang WANG1,3()   

  1. 1.Institute of Resources,Environment and Soil Fertilizer,Fujian Academy of Agricultural Sciences,Fuzhou 350013,China
    2.College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,China
    3.Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil,Fuzhou 350003,China
  • Received:2024-10-22 Revised:2024-12-16 Online:2025-09-20 Published:2025-07-02
  • Contact: Yi-xiang WANG

摘要:

生草覆盖作为一种生态友好型果园管理方式引起关注,但不同生草覆盖对土壤碳矿化及其温度敏感性作用机制仍缺乏认识。本研究基于福建省尤溪县玉池村28年的长期定位试验,研究清耕、果园套种圆叶决明和平托花生3种地被管理方式下果园土壤矿化速率及其温度敏感性的变化,为亚热带地区气候变化背景下果园土壤固碳减排与科学管理提供理论依据。结果表明:相对清耕模式,果园生草覆盖处理28年后土壤有机碳含量增加了19.20%~30.04%。在不同生草覆盖模式下,土壤有机碳累积矿化量与培养时间和温度呈正相关关系。在35 ℃时,果园套种平托花生处理的有机碳累积矿化量最高,为633.41 mg·kg-1,套种圆叶决明处理次之,两者分别比清耕处理提高72.75%和61.27%,潜在矿化量分别提高2.98和1.14倍。高温条件下(>25 ℃),果园套种平托花生和圆叶决明处理土壤矿化温度敏感性系数(Q10)分别比清耕处理降低了35.20%和47.37%。综上,长期果园生草覆盖提高了土壤有机碳含量,随着温度变化(>25 ℃),果园土壤有机碳矿化的温度敏感性随之降低,土壤碳库应对温度变化的响应稳定。其中平托花生覆盖处理效果优于圆叶决明覆盖处理。

关键词: 果园生草覆盖, 土壤有机碳, 矿化速率, 温度敏感性

Abstract:

Establishing ground cover is an eco-friendly orchard management method, but it is still poorly understood how different types of cover affect soil carbon mineralization and its temperature sensitivity. Based on a 28-year long-term monitoring experiment in Yuchi Village, Youxi County, Fujian Province, we investigated the changes in the soil mineralization rate and its temperature sensitivity in orchards with three different ground cover management strategies; clear tillage, and orchard interplanting with the legumes round-leaf cassia (Chamaecrista rotundifolia) or Arachis pintoi. The overall aim of this work was to provide a theoretical basis for reducing emissions of carbon sequestered in soil and for the scientific management of orchards in subtropical regions under climate change. The results showed that, compared with clear tillage, the interplanting treatments led to increased soil organic carbon content (SOC) (by 19.20%-30.04%) after 28 years. Across both interplanting modes, the cumulative mineralization of SOC was positively correlated with the incubation time and temperature. At 35 ℃, the highest cumulative mineralization of SOC was in the A. pintoi interplanting treatment (633.41 mg·kg-1), followed by the C. rotundifolia interplanting treatment; their SOC values were 72.75% and 61.27% higher than that of the cleartillage treatment, respectively. The potential mineralization was increased by 2.98 times in the A. pintoi interplanting treatment and by 1.14 times in the C. rotundifolia interplanting treatment, compared with the clear tillage treatment. Under high-temperature conditions (>25 ℃), the soil mineralization temperature sensitivity coefficient (Q10) of the A. pintoi interplanting treatment and the C. rotundifolia interplanting treatment were 35.20% and 47.37% lower, respectively, than that of the clear tillage treatment. In conclusion, long-term ground cover increased the SOC content of soil, and with increasing temperatures (>25 ℃), the temperature sensitivity of SOC mineralization in the soil decreased, and the response of the soil carbon pool to temperature change increased. Among the tested treatments, the A. pintoi interplanting treatment was more beneficial than the C. rotundifolia interplanting treatment.

Key words: orchard grass cover, soil organic carbon, mineralization rate, temperature sensitivity