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    张韫, 于悦, 崔晓阳, 王海淇. 试验林火干扰下大兴安岭北部落叶松林土壤含水率的时空变化[J]. 北京林业大学学报, 2020, 42(8): 94-101. DOI: 10.12171/j.1000-1522.20190182
    引用本文: 张韫, 于悦, 崔晓阳, 王海淇. 试验林火干扰下大兴安岭北部落叶松林土壤含水率的时空变化[J]. 北京林业大学学报, 2020, 42(8): 94-101. DOI: 10.12171/j.1000-1522.20190182
    Zhang Yun, Yu Yue, Cui Xiaoyang, Wang Haiqi. Spatiotemporal variations of soil moisture content in the Larix gmelinii forest under interference of experimental forest fire in northern Great Xing’an Mountains of northeastern China[J]. Journal of Beijing Forestry University, 2020, 42(8): 94-101. DOI: 10.12171/j.1000-1522.20190182
    Citation: Zhang Yun, Yu Yue, Cui Xiaoyang, Wang Haiqi. Spatiotemporal variations of soil moisture content in the Larix gmelinii forest under interference of experimental forest fire in northern Great Xing’an Mountains of northeastern China[J]. Journal of Beijing Forestry University, 2020, 42(8): 94-101. DOI: 10.12171/j.1000-1522.20190182

    试验林火干扰下大兴安岭北部落叶松林土壤含水率的时空变化

    Spatiotemporal variations of soil moisture content in the Larix gmelinii forest under interference of experimental forest fire in northern Great Xing’an Mountains of northeastern China

    • 摘要:
        目的  跟踪量化轻、中、重度火干扰下兴安落叶松林土壤含水率,定点分析其时空变化规律与火烧强度干扰差异,深入探讨其形成机制;旨在清楚地认识高寒区火干扰森林生态系统恢复初期土壤水分变化对植被恢复的影响力,并为其调控提供参考。
        方法  采用网格法确定固定点位并实施林火干扰试验,根据火烧强度等级划分轻、中、重度火烧区,烘干法跟踪监测火烧前、火烧后、翌年融雪季后、翌年生长季土壤含水率。
        结果  林火干扰后:(1)轻、中、重度火烧区土壤含水率立即下降,春旱时段进一步大幅下降,生长季迅速回升;(2)生长季前重度火烧区土壤含水率显著低于轻、中度火烧区,生长季火烧强度干扰差异消失;(3)生长季前,土壤含水率及其相对变化率的空间格局与火烧强度空间格局极显著负相关。
        结论  寒温带针叶林火干扰生态系统恢复初期,春旱时段重度火烧迹地土壤含水率可能限制植被更新和再生,应加强集水保水技术调控。

       

      Abstract:
        Objective  The spatiotemporal changes of soil moisture content under different fire intensities were analyzed by sequentially monitoring at the fixed points in the mild-, moderate-, severe-burned area of the Larix gmelinii forest, and the forming mechanism was discussed in order to understand the effects of soil moisture variation on vegetation restoration and provide references for artificial regulation in the early years after forest fire.
        Method  The fixed monitoring points were conducted by latticed co-coupled sampling method, then set fire. The burned sample plots were divided into the mild-, moderate-, severe-burned according to the fire intensity class, and soil moisture content was determined by the oven drying method before the burning, afer the burning, following the snowmelt season, and in the growing season, respectively.
        Result  After the fire, (1) soil moisture content decreased immediately in the mild-, moderate-, severe-burned area following the burning, further decreased sharply in the next spring, and rose in the growing season. (2) Soil moisture content in the severe-burned area was significantly lower than those in the mild-, moderate-burned area before the growing season, and no difference was found among the three areas in the growing season. (3) There was significantly negative correlation between the spatial pattern of soil moisture content or its relative change and fire intensity before the growing season.
        Conclusion  In the early years of post-fire coniferous forest restoration in the cold temperate zone, soil moisture content maybe limit vegetation restoration and regeneration in the severe-burned area in spring, and the regulation of rainwater harvesting and water conservation should be strengthened.

       

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