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大兴安岭北部试验林火干扰下土壤密度的时空变化

张韫 李传波 崔晓阳

张韫, 李传波, 崔晓阳. 大兴安岭北部试验林火干扰下土壤密度的时空变化[J]. 北京林业大学学报, 2018, 40(6): 48-54. doi: 10.13332/j.1000-1522.20170318
引用本文: 张韫, 李传波, 崔晓阳. 大兴安岭北部试验林火干扰下土壤密度的时空变化[J]. 北京林业大学学报, 2018, 40(6): 48-54. doi: 10.13332/j.1000-1522.20170318
Zhang Yun, Li Chuanbo, Cui Xiaoyang. Temporal and spatial variations of soil bulk density by experimental forest fire in Daxing'an Mountains of northeastern China[J]. Journal of Beijing Forestry University, 2018, 40(6): 48-54. doi: 10.13332/j.1000-1522.20170318
Citation: Zhang Yun, Li Chuanbo, Cui Xiaoyang. Temporal and spatial variations of soil bulk density by experimental forest fire in Daxing'an Mountains of northeastern China[J]. Journal of Beijing Forestry University, 2018, 40(6): 48-54. doi: 10.13332/j.1000-1522.20170318

大兴安岭北部试验林火干扰下土壤密度的时空变化

doi: 10.13332/j.1000-1522.20170318
基金项目: 

中央高校基本科研业务费专项 2572015CA15

国家自然科学基金项目 31570597

国家重点研发计划项目 2016YFA0600803

详细信息
    作者简介:

    张韫,博士,副教授。主要研究方向:森林土壤与林木营养。Email: rowena_zy@163.com 地址: 150040 黑龙江省哈尔滨市香坊区和兴路26号东北林业大学林学院

    责任作者:

    崔晓阳,教授,博士生导师。主要研究方向:森林土壤。Email: C_xiaoyang@126.com 地址:同上

  • 中图分类号: S714.5

Temporal and spatial variations of soil bulk density by experimental forest fire in Daxing'an Mountains of northeastern China

  • 摘要: 目的研究不同强度火干扰下寒温带针叶林土壤密度的时空变化格局及其形成机制, 旨在更好地认识火干扰后森林土壤密度的时空动态规律, 为火烧迹地改造和生态恢复提供参考。方法在大兴安岭北部寒温带杜香-杜鹃-落叶松林地内, 进行严密监控下的秋季林火点烧试验。采用网格法布设固定样地, 在火烧前后连续定点观测土壤密度的时空动态。结果林火干扰后:(1)各时段重度火烧区土壤密度较轻、中度火烧区高5%~10%, 且差异达极显著水平。(2)时间序列上土壤密度的变化模式因火烧强度而异, 其中轻度火烧区土壤密度因火烧立即下降而后逐渐升高, 中度火烧区土壤密度未因火烧立即产生实质性变化而后持续升高, 重度火烧区(及3个火烧强度区综合分析)表现为火烧后土壤密度立即升高并持续增强。(3)土壤密度(或土壤密度变化)空间格局与火烧强度空间格局极显著正相关, 火烧强度的作用效果在火烧后立即显现, 其相关程度在融雪季、雨季/生长季进一步加深。结论兴安落叶松林火烧迹地恢复初期, 因火烧强度差异导致的土壤密度变化方向的初始差异在雨季/生长季消失(均表现为升高), 中、重度火烧区土壤密度显著升高。

     

  • 图  1  样地监测点位布设及林火强度格局

    数字2~9表示火烧强度等级,其中,2、3表示轻度火烧,4、5、6表示中度火烧,7、8、9表示重度火烧。

    Figure  1.  Monitoring sites (small black dots) and the pattern of FI of sample plot

    Number from 2 to 9 means fire intensity (FI) subclass, mild subclass includes 2 and 3; moderate subclass includes 4, 5 and 6; severe subclass includes 7, 8 and 9.

    图  2  火烧时间序列土壤密度

    T0为火烧前1d,T1为火烧后1d,T2为融雪后,T3为雨季/生长季后。下同。总体即3个火烧强度区综合分析。

    Figure  2.  Soil bulk density (SBD) in time series

    T0 means the day before fire, T1 means the first day after fire, T2 means after snowmelt season, and T3 means after rainy and growing season. The same below. The overall means all the fire intensity area.

    图  3  火烧时间序列土壤密度的空间格局

    Figure  3.  Spatial pattern of SBD in time series

    图  4  火烧时间序列土壤密度变化的空间格局

    Figure  4.  Spatial pattern of SBDC in time series

    表  1  火烧后土壤密度点位变化率分级统计

    Table  1.   Monitoring site classification statistics on post-fire soil bulk density change (SBDC)

    火烧强度
    Fire intensity
    时间节点
    Time node
    火烧后土壤密度相对于火烧前变化率的分级统计
    Monitoring site classification statistics on post-fire soil bulk density change/%
    平均变化率及成对数据t检验
    Average change rate and the result of paired t test/%
    -5%~0 0~5% 5%~10% 10%~15% 15%~20% 20%~25% 25%~30%
    T1 75.00 25.00 -1.04**
    Mild T2 35.00 65.00 -0.28ns
    n=20 T3 25.00 75.00 0.30ns
    T1 74.07 25.93 0.24ns
    Moderate T2 3.70 88.89 3.70 3.70 2.61**
    n=27 T3 55.56 37.04 3.70 3.70 5.41**
    T1 42.11 47.37 10.53 10.93**
    Severe T2 42.11 47.37 10.53 11.13**
    n=19 T3 5.26 31.58 42.11 10.53 10.53 16.87**
    注:每个点位分别计算土壤密度变化率,即SBDCTn(%)=(SBDTn-SBDT0)/SBDT0×100,数据为各变化区间的点位分布频率%,即点位分布频率=(某变化区间的点位数/该火烧区点位数n)×100;点位平均变化率为Tn时段该火烧区各点位变化率的平均值;经成对数据t检验分析,**表示相对于T0时段土壤密度显著变化(P < 0.01),ns表示相对于T0时段无显著差异。Notes: SBDC of each monitoring site was calculated as follows: SBDCT n(%)=(SBDTn-SBDT0)/SBD T0×100, data was distribution frequency of monitoring site in each statistics classification, and was calculated as follows: distribution frequency (%)=(number of monitoring site in statistics classification/number of monitoring site in fire intensity area)×100; average change rate was average of SBDC at Tn time; ** means SBDC significant difference (P < 0.01) between Tn and T0, and ns means no significant difference by paired-samples t test.
    下载: 导出CSV

    表  2  土壤密度及其变化率与火烧强度相关性分析

    Table  2.   Correlation analysis between SBD or SBDC and FI

    时间序列
    Time series
    土壤密度与火烧强度相关性
    Correlation analysis between SBD and FI
    土壤密度变化率与火烧强度相关性
    Correlation analysis between SBDC and FI
    相关方程
    Correlation equation
    相关系数
    Correlation coefficient(r)
    相关方程
    Correlation equation
    相关系数
    Correlation coefficient(r)
    T0 SBD=-0.007FI+0.690 0.468**
    T1 SBD=0.005FI+0.642 0.361** SBDC=2.006FI-7.437 0.794**
    T2 SBD=0.005FI+0.652 0.370** SBDC=1.988FI-6.086 0.805**
    T3 SBD=0.011FI+0.637 0.670** SBDC=3.007FI-8.378 0.877**
    注:**表示土壤密度(或土壤密度变化率)与火烧强度之间相关性显著(P < 0.01)。Note: ** means significant correlation (P < 0.01) between SBD (or SBDC) and fire intensity.
    下载: 导出CSV
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  • 收稿日期:  2017-09-05
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