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应用生态学报 ›› 2026, Vol. 37 ›› Issue (8): 2647-2654.doi: 10.13287/j.1001-9332.202608.007

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封育草地根系生长与球囊霉素固碳的年限效应

陶斯涛1,2,3, 朱兆龙1,2,4*, 王宝荣5, 郭梁1,2, 安韶山1,2,4   

  1. 1中国科学院教育部水土保持与生态环境研究中心, 陕西杨凌 712100;
    2中国科学院水利部水土保持研究所, 陕西杨凌 712100;
    3中国科学院大学, 北京 100049;
    4西北农林科技大学水土保持与荒漠化整治全国重点实验室, 陕西杨凌 712100;
    5西北农林科技大学草业与草原学院, 陕西杨凌 712100
  • 收稿日期:2025-12-15 修回日期:2026-06-03 出版日期:2026-08-18 发布日期:2027-02-18
  • 通讯作者: *E-mail: zhu_zl@nwafu.edu.cn
  • 作者简介:陶斯涛, 男, 2001年生, 硕士研究生。主要从事土壤微生物固碳研究。E-mail: 1532928715@qq.com
  • 基金资助:
    国家自然科学基金项目(42307440,42577400,42507466)、中国博士后基金会博后面上项目(2023M732879)、陕西省博士后特别资助项目(2023BSHTBZZ27)和国家资助博士后研究人员计划项目(GZC20232153)

Temporal effects of grassland enclosure on root growth and glomalin-mediated carbon sequestration

TAO Sitao1,2,3, ZHU Zhaolong1,2,4*, WANG Baorong5, GUO Liang1,2, AN Shaoshan1,2,4   

  1. 1Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling 712100, Shaanxi, China;
    2Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China;
    3University of Chinese Academy of Sciences, Beijing 100049, China;
    4State Key Laboratory of Soil and Water Conservation and Desertification Control, Northwest A&F University, Yangling 712100, Shaanxi, China;
    5College of Grassland Science,Northwest A&F University, Yangling 712100, Shaanxi, China
  • Received:2025-12-15 Revised:2026-06-03 Online:2026-08-18 Published:2027-02-18

摘要: 封育是退化草地修复的关键措施之一,草地恢复后固碳效应的提升直接关系到区域生态质量改善及碳中和目标的实现。以云雾山国家级自然保护区天然牧草地和不同封育年限(5、10、25、30年)草地为研究对象,采用内生长土芯法开展4年原位根系生长(6、12、24、48个月)试验,探究封育草地根系生长与球囊霉素相关土壤蛋白(GRSP)固碳的年限效应。结果表明:在不同封育年限样地中,生长袋内根系生物量随样地封育年限增长而显著增加,在封育25年样地达到峰值(每袋0.36 g),较天然牧草地增长了125.0%。GRSP含量与根系生物量同步增长,在封育25年样地达到最大值(3.16 g·kg-1)。偏最小二乘路径模型分析显示,根系生物量与GRSP通过促进颗粒态有机碳积累(路径系数分别为0.18和0.33)驱动土壤有机碳固存(路径系数=0.47)。主成分(PC)分析表明,封育25年样地的PC1得分最高,表明该阶段活性碳库积累达到最优。此时该样地土壤有机碳与矿物结合态有机碳含量也最高,证实封育25年是该区域草地碳库积累的关键节点。建议该区域草地封育25年后适度利用,以加快养分循环,进一步提升草地生态系统碳汇潜力。

关键词: 封育草地, 根系生长, 球囊霉素相关土壤蛋白, 土壤有机碳, 内生长土芯法

Abstract: Enclosure is one of the key measures for restoring degraded grasslands. The enhancement of carbon sequestration after grassland restoration is directly related to the improvement of regional ecological quality and the achievement of carbon neutrality goals. We conducted an in-situ root growth experiment lasting for four years (6, 12, 24, and 48 months) using the internal growth core method across natural grassland and grasslands with different closure durations (5, 10, 25, and 30 years) in Yunwushan National Nature Reserve. We explored the duration effect on root growth and globulin-related soil protein (GRSP) carbon sequestration in enclosed grasslands. The results showed that in plots with different closure durations, root biomass in growth bags significantly increased with the duration of closure, reaching a peak (0.36 g per bag) in the 25-year closure plot, which was a 125.0% increase compared to that in the natural grassland. The GRSP content increased simultaneously with the root biomass, reaching a maximum value (3.16 g·kg-1 ) in the 25-year closure plot. Partial least squares path model analysis revealed that root biomass and GRSP drove soil organic carbon sequestration by promoting the accumulation of particulate organic carbon (path coefficients of 0.18 and 0.33, respectively), which in turn affected soil organic carbon sequestration (path coefficient=0.47). Principal component (PC) analysis indicated that the PC1 score was highest in the 25-year closure plot, suggesting that the accumulation of reactive carbon pool reached its optimal level. At this stage, the soil organic carbon and mineral-bound organic carbon conten were also the highest, confirming that 25 years of closure is a key milestone for carbon pool accumulation. We recommended that grasslands in this region be moderately utilized after 25 years of closure to accelerate nutrient cycling and further enhance the carbon sink potential of the grasslands.

Key words: enclosed grassland, root growth, glomalin-related soil protein, soil organic carbon, ingrowth core method