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草业学报 ›› 2023, Vol. 32 ›› Issue (11): 53-64.DOI: 10.11686/cyxb2023011

• 研究论文 • 上一篇    下一篇

荒漠草原人工柠条引入后土壤团聚体几何分布及拓扑结构演变特征

朱志昊1,2,3(), 孟晨1,2,3(), 王兴1,2,3, 宋乃平1,2,3, 王丽1,2,3, 徐苗苗4, 杜灵通1,2,3   

  1. 1.宁夏大学西北土地退化与生态系统恢复国家重点实验室培养基地,宁夏 银川 750021
    2.西北退化生态系统恢复与重建教育部重点实验室,宁夏 银川 750021
    3.宁夏大学生态环境学院,宁夏 银川 750021
    4.宁夏大学农学院,宁夏 银川 750021
  • 收稿日期:2023-01-05 修回日期:2023-03-27 出版日期:2023-11-20 发布日期:2023-09-27
  • 通讯作者: 孟晨
  • 作者简介:E-mail: mengchen@nxu.edu.cn
    朱志昊(1998-),男,宁夏石嘴山人,在读硕士。E-mail: 1019731487@qq.com
  • 基金资助:
    宁夏自然科学基金项目(2021AAC05005);宁夏重点研发计划项目(2021BEB04012)

Geometric distribution, formation, and topological structure of soil aggregates after introduction of Caragana korshinskii on the desert steppe

Zhi-hao ZHU1,2,3(), Chen MENG1,2,3(), Xing WANG1,2,3, Nai-ping SONG1,2,3, Li WANG1,2,3, Miao-miao XU4, Ling-tong DU1,2,3   

  1. 1.Key Laboratory of Land Degradation and Ecosystem Restoration in Northwest China,Ningxia University,Yinchuan 750021,China
    2.Key Laboratory of Rehabilitation and Reconstruction of Degraded Ecosystems in Northwest China,Yinchuan 750021,China
    3.College of Ecological Environment,Ningxia University,Yinchuan 750021,China
    4.College of Agronomy,Ningxia University,Yinchuan 750021,China
  • Received:2023-01-05 Revised:2023-03-27 Online:2023-11-20 Published:2023-09-27
  • Contact: Chen MENG

摘要:

为深入理解人工柠条林建植后土壤团聚体分布及拓扑结构演变过程,认识柠条引入及生长中的土壤生态过程与功能,指导柠条林及土壤资源管理策略制定,本研究选取宁夏盐池县荒漠草原区的5种林龄(0、9、14、24、35年生)的柠条林地为研究对象,通过CT扫描、图像处理分析等方法研究不同林龄柠条林地土壤团聚体几何分布及拓扑结果特征。结果表明:随着柠条引入及林龄增加,土壤团聚体数量、长度、体积、表面积和平均等效直径整体上呈增多的趋势,而团聚体平均球度随之减少;土壤团聚体数量随着土壤深度增加而增加,但团聚体平均等效直径、平均球度随着土壤深度增加而减小,可见人工柠条林地表层土壤团聚体稳定性更强。柠条引入及持续恢复有利于表层土壤团聚体(尤其是大团聚体)的形成,但团聚体平均球度呈下降趋势,可见柠条林引入后土壤中形成的团聚体形态及稳定性不同于草地土壤团聚体,今后研究需要关注表征团聚体稳定性的重要形态特征,这对于充分认识土壤团聚体演变过程及其生态功能具有重要意义。

关键词: 团聚体, 几何分布, 拓扑结构, 柠条, CT扫描

Abstract:

The aims of this work were to understand the distribution, formation, and topological structure of soil aggregates after the artificial establishment of Caragana korshinskii shrubland, and to understand changes in soil ecology and function after the introduction and growth of C. korshinskii. Ultimately, the goal is to guide the formulation of strategies to manage C. korshinskii shrubland and soil resources. C. korshinskii shrublands of five different ages (0, 9, 14, 24, and 35 years old) in the desert steppe area of Yanchi County, Ningxia, were selected as the study sites. The geometric distribution and topology of soil aggregates in C. korshinskii shrubland of different ages were studied by CT scanning and image analyses. With increasing time after the introduction of C. korshinskii, the number, length, volume, surface area, and average equivalent diameter of soil aggregates showed increasing trends, while the average sphericity of aggregates decreased. The number of soil aggregates increased with greater soil depth, but the average equivalent diameter and average sphericity of aggregates decreased with greater soil depth. The introduction and continuous restoration of C. korshinskii were conducive to the formation of surface soil aggregates (especially large aggregates), but led to a decrease in the average sphericity of aggregates. The morphology and stability of aggregates formed in the soil after the introduction of C. korshinskii shrubland differed from those of grassland soil aggregates. Further studies should focus on which morphological characteristics are related to aggregate stability, as this is of great significance for understanding the formation of soil aggregates and their ecological functions.

Key words: aggregates, geometric distribution, topology, Caragana korshinskii, CT scanning