计划烧除对云南松林枯落物蓄积特征及持水性能的影响
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S715.3

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国家自然科学基金项目“云南松林枯落物计划烧除对坡面产流产沙的影响机理研究”(31860212);云南省教育厅科学研究资助项目(2020Y0389);云南省高校土壤侵蚀与控制重点实验室建设项目〔云教科(2016)37号〕


Effects of Prescribed Burning on Accumulation and Water Holding Capacity of Litters in Pinus Yunnanensis Forest
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    摘要:

    [目的] 探讨计划烧除对枯落物蓄积特征及持水性的影响,为科学实施森林计划烧除措施和评价计划烧除的生态环境效应提供理论支撑。[方法] 枯落物蓄积量采用样方调查法计算,枯落物持水量采用室内浸泡法测定,枯落物年输入动态调查采用野外定位收集器法。[结果] ①计划烧除样地燃烧剩余物蓄积量为3.84 t/hm2,仅为未烧除样地枯落物蓄积量的21%;未烧除样地枯落物蓄积量为18.64 t/hm2。②计划烧除样地燃烧剩余物最大持水量14 t/hm2,未烧样地分枯落物最大持水量60.62 t/hm2,计划烧除和未烧除样地枯落物层持水量与浸泡时间符合对数函数关系,枯落物层吸水速率与浸泡时间呈幂函数关系。③计划烧除和未烧除样地枯落物年输入总量相似,最大输入量在4月,占全年增加量的20%~24%,1 a后计划烧除样地的有效持水量恢复到未烧除样地的73%。[结论] 云南松林计划烧除后,短期内枯落物蓄积量减少,枯落物持水能力降低,枯落物输入量无显著差别。

    Abstract:

    [Objective] The influence of prescribed burning on accumulation and water holding capacity of litters in Pinus yunnanensis forest was investigated, in order to provide a scientific basis for predicting the environmental effects of prescribed fire.[Methodes] The litter accumulation amounts and hydrological characters were tested and compared between the unburned and burned forests by prescribed fire. Litter accumulation amounts were obtained by field positioning collector methods and the hydrological character was investigate indoor immersion method.[Results] ① The volume of combustion residue after prescribed fire sample plot was 3.84 t/hm2, which was only 21% of the volume of litter in the unburned sample plot, and the volume of litter in the unburned sample plot was 18.64 t/hm2. ② The maximum water-holding capacity of forest litters after prescribed fire was 14 t/hm2, which was significantly lower than that in unburned forest with the total maximum water-holding capacity of 60.62 t/hm2. The water-holding capacity of the litter layer and soaking time in both unburned and prescribed burned sample land showed a significantly logarithmic relationship, and the immersion time and the absorption rate of forest litters showed a significantly power function relationship with the immersion time. ③ The maximum amount of litter input was in April, accounting for 20%-24% of the annual increase. After 1 year, the effective water-holding capacity in the prescribed burnt land was restored to 73%.[Conclusion] After the prescribed fire, the litter storage and the waster holding capacity can decrease in short term. However, with the natural recovery, the water conservation of the litter of Pinus yunnanensis forest can gradually recover.

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赵雨田,陈奇伯,黎建强,杨建光.计划烧除对云南松林枯落物蓄积特征及持水性能的影响[J].水土保持通报,2021,41(2):99-104

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  • 收稿日期:2020-10-07
  • 最后修改日期:2020-12-07
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  • 在线发布日期: 2021-05-21
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