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林业科学 ›› 2025, Vol. 61 ›› Issue (10): 60-73.doi: 10.11707/j.1001-7488.LYKX20250161

• 研究论文 • 上一篇    

华北落叶松林和油松林地表可燃物特征、土壤理化性质及林下植物多样性对林间草地放牧的响应

索奥丽1,2,陈锋1,2,3,龚俊伟1,2,程定野1,2,代世奥1,2,马成功4,刘晓东1,2,*()   

  1. 1. 北京林业大学森林资源生态系统过程北京市重点实验室 北京 100083
    2. 北京林业大学森林草原火灾风险防控应急管理部重点实验室 北京 100083
    3. 内蒙古七老图山森林生态系统国家定位观测研究站 赤峰 024000
    4. 内蒙古自治区赤峰市喀喇沁旗旺业甸实验林场 赤峰 024000
  • 收稿日期:2025-03-22 出版日期:2025-10-25 发布日期:2025-11-05
  • 通讯作者: 刘晓东 E-mail:xd_liu@bjfu.edu.cn
  • 基金资助:
    国家重点研发计划项目课题“雷击火发生区和山地可燃物风险评估及生态调控关键技术研发与示范”(2023YFD2202002);国家林业和草原局揭榜挂帅项目“三北工程攻坚战关键技术研发(202401)”;中国林业科学研究院基本科研业务费专项资助(CAFYBB2024ZA004)。

Response of Surface Fuel Characteristics, Soil Physicochemical Properties, and Understory Plant Diversity to Forest Grassland Grazing in Larix gmelinii var. principis-rupprechtii and Pinus tabuliformis Forests

Aoli Suo1,2,Feng Chen1,2,3,Junwei Gong1,2,Dingye Cheng1,2,Shi’ao Dai1,2,Chenggong Ma4,Xiaodong Liu1,2,*()   

  1. 1. Beijing Key Laboratory for Forest Resources and Ecosystem Processes, Beijing Forestry University Beijing 100083
    2. Emergency Management Department Key Laboratory of Forest Grassland Fire Risk Prevention and Control, Beijing Forestry University Beijing 100083
    3. Qilaotu National Forest Ecosystem Positioning Observation and Research Station, Inner Mongolia Chifeng 024000
    4. Wangyedian Experimental Forest Farm, Kalaqin Banner, Chifeng, Inner Mongolia Autonomous Region Chifeng 024000
  • Received:2025-03-22 Online:2025-10-25 Published:2025-11-05
  • Contact: Xiaodong Liu E-mail:xd_liu@bjfu.edu.cn

摘要:

目的: 探究林间草地放牧对华北落叶松林和油松林地表可燃物特征、地表潜在火行为、土壤理化性质及林下植物多样性的影响,提出基于放牧的可持续火灾风险管理方案,为营林区火灾风险防控提供科学的实践路径。方法: 以华北落叶松和油松成熟林(林龄41~60年)为研究对象,在禁牧和中等强度放牧(3头·hm?2)地区建立样地,调查地表可燃物特征、土壤理化性质和林下植物多样性等,选择研究区2010—2023年防火期风速的第50百分位数(16 km?h?1)和第97百分位数(27 km?h?1)作为模拟风速,在BehavePlus 6.0软件中进行地表火蔓延速率、火线强度和火焰长度模拟,采用单因素方差分析评估放牧对土壤理化性质的长期影响,运用主成分分析法评估放牧对地表可燃物特征、地表潜在火行为及林下植物多样性的综合影响,探究放牧作为可燃物生态调控措施的可行性。结果: 1) 林间草地放牧可显著降低华北落叶松林和油松林草本层可燃物载量和地表可燃物床层厚度,降低幅度分别为72.09%~75.22%和79.07%~89.74%,同时可提高草本层物种多样性指数,其中Shannon-Wiener多样性指数提高12.42%~42.67%,Simpson多样性指数提高11.11%~33.33%;放牧使华北落叶松林土壤全磷含量减少21.74%,使油松林土壤全钾含量减少2.91%。2) 火行为模拟表明,放牧可在极端风速(27 km?h?1)条件下将地表火火线强度维持在500 kW?m?1以下,并将火焰长度由3~4 m降至1.5 m以下。3) 主成分分析结果表明,华北落叶松林放牧处理和油松林放牧处理的综合得分最高。华北落叶松林放牧处理在降低火灾风险与生态恢复力之间取得平衡;对油松林来说,在实施放牧管理的同时,探索补植高抗火性草本植物的可能性,可能有助于更好地平衡火险控制与林下植物多样性保护。结论: 中等强度放牧可作为基于自然的可持续火风险管理方案,但需注意长期放牧可能导致的磷、钾元素流失风险,需结合树种特性的生态反馈制定适宜的放牧策略。

关键词: 放牧, 林间草地, 可燃物特征, 潜在地表火行为, 植物多样性

Abstract:

Objective: This study aimed to investigate the effects of forest grassland grazing on surface fuel characteristics, potential surface fire behavior, soil physicochemical properties, and understory plant diversity in Larix gmelinii var. principis-rupprechtii and Pinus tabuliformis forests, and to propose a grazing-based sustainable fire risk management strategy that provides a scientific pathway for fire risk prevention in forest management areas. Method: This study focused on two typical coniferous forests in north China: mature stands (41?60 years old) of L. gmelinii var. principis-rupprechtii and P. tabuliformis. Sample plots were established under ungrazed and moderate grazing conditions (3 cattle·hm?2), where surface fuel characteristics, soil physicochemical properties, and understory plant diversity were surveyed. Based on the 50th percentile (16 km?h?1) and 97th percentile (27 km?h?1) of wind speed during the fire season (2010—2023), simulations of surface fire spread rate, fireline intensity, and flame length were conducted using BehavePlus 6.0. One-way ANOVA was applied to evaluate the long-term impacts of grazing on soil physicochemical properties, and principal component analysis (PCA) was used to assess the comprehensive effects of grazing on surface fuel characteristics, potential surface fire behavior, and understory plant diversity, thereby exploring the feasibility of grazing as an ecological fuel management measure. Result: 1) Forest grassland grazing significantly reduced herb fuel load and surface fuelbed depth in both forest types by 72.09%?75.22% and 79.07%?89.74%, respectively, while enhancing herb layer species diversity, with the Shannon-Wiener index increasing by 12.42%?42.67% and the Simpson index by 11.11%?33.33%. Grazing decreased total soil phosphorus by 21.74% in L. gmelinii var. principis-rupprechtii forests and total soil potassium by 2.91% in P. tabuliformis forests; 2) Fire behavior simulations demonstrated that under extreme wind speeds (27 km?h?1), grazing maintained fireline intensity below 500 kW?m?1 and reduced flame length from 3?4 m to less than 1.5 m; 3) PCA results revealed that grazing treatments achieved the highest comprehensive scores for both forest types. In L. gmelinii var. principis-rupprechtii forests, grazing balanced wildfire risk reduction with ecological resilience, whereas in P. tabuliformis forests, combining grazing with the introduction of highly fire-resistant herbaceous species may better harmonize fire risk control with understory plant diversity conservation. Conclusion: Moderate intensity grazing can serve as a nature-based wildfire risk management solution, but attention should be paid to the risk of phosphorus and potassium depletion under long-term grazing, and grazing strategies should be tailored to species-specific ecological feedbacks.

Key words: grazing, forest grassland, fuel characteristic, potential surface fire behavior, plant diversity

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