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半干旱矿区采动地表裂缝与塌陷坑对土壤呼吸的影响

The impact of mining-induced surface cracks and collapse pits on soil respiration in semi-arid mining areas

  • 摘要: 采煤引发的地表裂缝和沉陷导致土壤理化、微生物性质下降、以及植被破坏等,国内外学者对此开展了大量研究,但针对矿区不同闭合阶段地表裂缝与沉陷对土壤呼吸影响的研究鲜有报道。于2024年12月和2025年4月2次对发展初期无闭合(S1、S2)、中期未完全闭合(S3)、后期完全闭合(S4)的地表裂缝及部分自我修复塌陷坑S5、未自我修复塌陷坑S6周围土壤呼吸利用EMG-5土壤呼吸仪进行实测,同时观测土壤温湿度,探讨了因采煤导致的地表裂缝和塌陷坑对土壤呼吸的影响。结果表明:在裂缝发展初期无闭合(S1、S2)、中期未完全闭合(S3)及未自我修复塌陷坑(S6)阶段,土壤呼吸呈“V”形特征,即裂缝中心和塌陷坑中心土壤呼吸值最小,从中心往两边土壤呼吸呈增大趋势,裂缝对土壤呼吸的影响范围约为距离裂缝50~80 cm,塌陷坑对土壤呼吸的影响范围约为距离塌陷坑20 cm,裂缝越宽对周围的土壤呼吸影响范围越大。在裂缝发展后期完全闭合(S4)和部分自我修复沉陷(S5)阶段,土壤呼吸呈多个“V”字构成的波浪形特征,裂缝与塌陷坑中心土壤呼吸与任何距离上的土壤呼吸均无显著性差异,说明研究区裂缝和塌陷坑具有自我修复特征,自我修复效果越好对周围的土壤呼吸影响范围越小,完全闭合的地表裂缝对周围土壤呼吸几乎无影响。裂缝和塌陷坑周边土壤温湿度对土壤呼吸的影响呈现距离依赖性:5 cm范围内土壤湿度为主导因子(P<0.01),5 cm范围外土壤温度为主导因子(P<0.05),二者均表现为显著负相关,在采样时可抑制土壤呼吸。对于能够自我修复的裂缝和塌陷坑,不需要采用人工干预;对于裂缝宽度大、沉陷较深的塌陷坑不能进行自我修复,需要采取覆土回填、种植植被等人工修复措施,防止生态环境进一步恶化。研究结果有助于深化对地表裂缝和塌陷坑对土壤呼吸过程干扰的理解,为矿区生态修复提供对策和建议。

     

    Abstract: Coal mining-induced surface cracks and subsidence lead to the degradation of soil physicochemical and microbial properties, as well as vegetation destruction. While extensive research has been conducted on these issues, investigations concerning the impact of surface cracks and subsidence on soil respiration across different closing stages in mining areas remain scarce. In December 2024 and April 2025, soil respiration was measured using an EMG-5 soil respiration analyzer around surface features at various developmental stages: early-stage non-closed cracks (S1, S2), mid-stage semi-closed cracks (S3), late-stage fully closed cracks (S4), partially self-repaired collapse pits (S5), and non-self-repaired collapse pits (S6). Concurrent observations of soil temperature and moisture were conducted to explore the effects of mining-induced surface cracks and collapse pits on soil respiration. The results indicate that during the early non-closed (S1, S2), mid-stage semi-closed (S3), and non-self-repaired collapse pit (S6) stages, soil respiration exhibited a “V”-shaped pattern. Specifically, respiration values were lowest at the centers of cracks and pits, increasing outwardly toward the sides. The sphere of influence on soil respiration was approximately 50–80 cm from the cracks and 20 cm from the collapse pits, with wider cracks exerting a more extensive influence range. In the late-stage fully closed (S4) and partially self-repaired subsidence (S5) stages, soil respiration displayed a wavy characteristic composed of multiple “V” shapes. No significant difference was observed between soil respiration at the centers of cracks or pits and that at any measured distance, suggesting self-healing characteristics in the study area. Improved self-healing effects corresponded to a smaller sphere of influence, with fully closed surface cracks showing almost no impact on surrounding soil respiration. The influence of soil temperature and moisture on soil respiration around cracks and collapse pits demonstrated distance dependence. Within a 5 cm range, soil moisture was the dominant factor (P<0.01), whereas outside the 5 cm range, soil temperature prevailed (P<0.05). Both factors showed a significant negative correlation, acting to inhibit soil respiration during the sampling periods. Consequently, artificial intervention is deemed unnecessary for surface cracks and collapse pits capable of self-repair. Conversely, for wide cracks and deep subsidence pits unable to self-repair, artificial restoration measures—such as soil backfilling and vegetation planting—are required to prevent further ecological deterioration. These findings deepen the understanding of how surface cracks and collapse pits disturb soil respiration processes and provide strategies and recommendations for ecological restoration in mining areas.

     

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