| 计划烧除对云南松林土壤抗蚀和抗冲性的影响 |
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| 引用本文： | 杨馥羽,陈奇伯,黎建强,龚顺清,付钇珊.计划烧除对云南松林土壤抗蚀和抗冲性的影响[J].浙江农林大学学报,2023,40(1):188-197. |
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| 作者姓名： | 杨馥羽 陈奇伯 黎建强 龚顺清 付钇珊 |
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| 作者单位： | 1.西南林业大学 生态与环境学院，云南 昆明 6502242.西南林业大学 石漠化研究院，云南 昆明 650224 |
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| 基金项目： | 国家自然科学基金资助项目(31860212) |
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| 摘 要： | 目的 计划烧除是森林预防火灾的重要措施之一。探究计划烧除对云南松Pinus yunnanensis林地土壤抗蚀性和抗冲性的影响，为森林的可持续经营以及优化林区计划烧除作业提供可靠的科学依据。 方法 以滇中高原云南松林计划烧除样地为研究对象，通过野外调查取样与室内实验分析相结合的方法，系统研究了计划烧除对云南松林土壤抗蚀性和抗冲性的影响。 结果 ①周期性计划烧除后，土壤0~40 cm土层中粒径＞2.00 mm的机械稳定性团聚体含量增加，粒径＞2.00 mm的水稳性团聚体含量减少，水稳性团聚体平均质量直径和平均几何直径减小，土壤团聚体结构破坏率增大，抗蚀指数减小，40~60 cm土层中土壤抗蚀性指标无明显变化。②计划烧除后地表凋落物蓄积量减小，凋落物持水性能与拦蓄能力减弱，植物根系被烧毁。周期性计划烧除后凋落物和根系减少是林地内土壤抗冲系数减小的主要原因。 结论 计划烧除使土壤表层抗水蚀能力下降。随着土层深度增加，计划烧除对土壤抗蚀性的影响逐渐减小，火烧后地表凋落物和植被根系减少，抗冲性能减弱。图1表6参37
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| 关 键 词： | 计划烧除 云南松林 土壤抗蚀性 土壤抗冲性 |
| 收稿时间： | 2022-04-25 |
Effect of prescribed burning on soil anti-erodibility and anti-scourability of Pinus yunnanensis forest |
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| YANG Fuyu,CHEN Qibo,LI Jianqiang,GONG Shunqing,FU Yishan.Effect of prescribed burning on soil anti-erodibility and anti-scourability of Pinus yunnanensis forest[J].Journal of Zhejiang A&F University,2023,40(1):188-197. |
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| Authors: | YANG Fuyu CHEN Qibo LI Jianqiang GONG Shunqing FU Yishan |
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| Institution: | 1.College of Ecology and Environment, Southwest Forestry University, Kunming 650224, Yunnan, China2.Research Institute of Rocky Desertification, Southwest Forestry University, Kunming 650224, Yunnan, China |
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| Abstract: | Objective Prescribed burning is an essential measure for forest fire prevention. The purpose of this study is to explore the impact of prescribed burning on soil anti-erodibility and anti-scourability of Pinus yunnanensis forest, so as to provide scientific basis for sustainable forest management and optimization of prescribed burning in forest areas. Method The sample plots of P. yunnanensis forest in central Yunnan Plateau were selected as the research objects. The effects of prescribed burning on soil anti-erodibility and anti-scourability of P. yunnanensis forest were systematically studied by combining field investigation and sampling with indoor experimental analysis. Result (1) After prescribed burning, the content of mechanically stable aggregates(＞2.00 mm) in 0?40 cm soil layer increased and the content of waterstable aggregates (＞2.00 mm) decreased. The mean mass diameter and mean geometric diameter of the water stable aggregates decreased. The damage rate of soil aggregate structure increased, and the erosion resistance index decreased. The soil erosion resistance index of 40?60 cm soil layer did not change significantly. (2)After the prescribed burning, the litter accumulation decreased and the water holding capacity and storage capacity of the litter weakened, and the plant root system was burned. The decrease of litter and root system after periodic burning was the main reason for the decrease of soil erosion resistance coefficient in forest land. Conclusion Prescribed burning reduces water erosion resistance of soil surface. With the increase of soil depth, the impact of planned burning on soil erosion resistance gradually decreases. After prescribed burning, the surface litter and vegetation roots decrease and the erosion resistance weakens. Ch, 1 fig. 6 tab. 37 ref.] |
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