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密度调控对长白落叶松人工林土壤呼吸的影响

邵英男 田松岩 刘延坤 陈瑶 孙志虎

邵英男, 田松岩, 刘延坤, 陈瑶, 孙志虎. 密度调控对长白落叶松人工林土壤呼吸的影响[J]. 北京林业大学学报, 2017, 39(6): 51-59. doi: 10.13332/j.1000-1522.20170029
引用本文: 邵英男, 田松岩, 刘延坤, 陈瑶, 孙志虎. 密度调控对长白落叶松人工林土壤呼吸的影响[J]. 北京林业大学学报, 2017, 39(6): 51-59. doi: 10.13332/j.1000-1522.20170029
SHAO Ying-nan, TIAN Song-yan, LIU Yan-kun, CHEN Yao, SUN Zhi-hu. Effects of density control on soil respiration in Larix olgensis plantation.[J]. Journal of Beijing Forestry University, 2017, 39(6): 51-59. doi: 10.13332/j.1000-1522.20170029
Citation: SHAO Ying-nan, TIAN Song-yan, LIU Yan-kun, CHEN Yao, SUN Zhi-hu. Effects of density control on soil respiration in Larix olgensis plantation.[J]. Journal of Beijing Forestry University, 2017, 39(6): 51-59. doi: 10.13332/j.1000-1522.20170029

密度调控对长白落叶松人工林土壤呼吸的影响

doi: 10.13332/j.1000-1522.20170029
基金项目: 

黑龙江省科技攻关项目 GC12C203

国家自然科学基金面上项目 41275154

黑龙江省科技攻关项目 GC12C203

详细信息
    责任作者:

    邵英男, 助理研究员。主要研究方向:森林生态。Email:syn84@163.com地址: 150081黑龙江省哈尔滨市南岗区哈平路134号黑龙江省森林工程与环境研究所

  • 中图分类号: S718.5

Effects of density control on soil respiration in Larix olgensis plantation.

  • 摘要: 为探明密度调控对北温带森林土壤呼吸的影响机制,以长白落叶松人工林为研究对象,选择4种林分密度P1(300~350株/hm2)、P2(500~550株/hm2)、P3(600~650株/hm2)和P4(850~900株/hm2),使用LI-6400便携式土壤呼吸测定仪对其生长季(5—10月)土壤呼吸速率进行测定。结果表明:不同密度林分生长季土壤呼吸速率均呈现明显的季节动态,最高值均出现在8月末,最低值出现在10月中旬;不同密度林分生长季土壤呼吸速率及土壤累积CO2排放量均随林分密度增大而显著降低(P<0.05)。不同密度林分土壤呼吸与土壤温度之间均呈极显著的指数相关(P<0.001),但与土壤含水量之间相关关系不显著(P>0.05);双因素模型拟合效果更优,土壤温度和含水量共同解释了土壤呼吸速率的73.1%~81.0%。土壤呼吸温度敏感系数Q10值表现为:在300~350株/hm2时最低(2.41),500~550株/hm2最高(3.32)。生物因子随着林分密度的增大而显著增大(P<0.05),非生物因子均随林分密度增大而显著减小(P<0.05);生长季土壤累积CO2排放量与生物因子达到极显著负相关(P<0.001),与非生物因子均达到极显著正相关(P<0.001)。逐步线性回归分析表明,生长季凋落物量、土壤有机碳、微生物生物量碳含量和土壤全氮含量与土壤呼吸的关系最为密切。综上所述,不同密度林分之间土壤温度及含水量、生物及非生物因子的差异是导致土壤CO2排放产生差异的主要原因。在森林经营管理中,为减小森林土壤CO2的排放量,应将林分密度设置为850~900株/hm2

     

  • 图  1  不同林分密度土壤呼吸速率、温度和含水量的季节变化(平均值±标准误)

    Figure  1.  Seasonal dynamics of soil respiration rate, soil temperature and soil water content with different stand densities(mean±SE)

    图  2  Q10与5 cm深处土壤温度变化幅度(Tr)的关系

    Tr表示各林分密度5 cm深处土壤温度变化幅度。

    Figure  2.  Relationship between Q10 and soil temperature range at 5 cm depth

    Tr indicates soil temperature range at 5 cm depth with different stand densities.

    图  3  生长季土壤累积CO2排放量与生物、非生物影响因子的相关关系

    Figure  3.  Correlations with cumulative soil CO2-C efflux, biotic and abiotic factors during the growing season

    表  1  样地概况

    Table  1.   Summary of sample plot

    参数Parameter 样地编号Plot No.
    P1 P2 P3 P4
    林分密度/(株·hm -2)Stand density/(plant·ha -1) 300~350 500~550 600~650 850~900
    平均胸径Mean DBH/cm 23.97±0.25a 24.57±0.31a 21.72±0.22a 18.89±0.52b
    平均树高Mean tree height/m 24.90±0.05a 21.70±0.12a 21.26±0.15a 17.36±0.08b
    胸高断面积/(m 2·hm -2)Basal area at breast height/(m 2·ha -1) 13.91±0.07b 24.51±0.14a 22.86±0.12a 24.53±0.11a
    生长季凋落物量/(t·hm -2)Litter biomass during the growing season/(t·ha -1) 6.20±0.30d 9.34±0.04c 11.52±0.08b 13.48±0.06a
    0~10 c m土壤碳氮比0-10 cm soil C/N ratio 34.14±0.45b 33.55±1.49b 36.71±0.93b 43.01±2.12a
    0~10 cm土壤密度0-10 cm soil bulk density/(g·cm -3) 1.24±0.07a 1.26±0.17a 1.23±0.04a 1.13±0.04a
    0~10 cm土壤全氮含量0-10 cm soil total nitrogen content/(g·kg -1) 2.35±0.12a 2.11±0.04b 1.79±0.04c 1.46±0.09d
    0~10 cm土壤全磷含量0-10 cm soil total phosphorus content/(g·kg -1) 2.86±0.03a 2.13±0.02b 1.37±0.09c 1.01±0.07d
    0~10 cm土壤有机碳含量0-10 cm soil organic carbon content/(g·kg -1) 80.23±3.55a 70.78±0.62b 65.17±1.63c 62.79±0.24d
    0~10 cm土壤微生物生物量碳含量0-10 cm microbial biomass carbon content/(mg·kg -1) 626.20±5.91a 554.90±6.72b 490.30±2.15c 461.40±4.10d
    0~10 cm土壤水溶性有机碳含量0-10 cm water soluble organic carbon content/(mg·kg -1) 0.26±0.05b 0.84±0.32ab 0.32±0.05b 1.24±0.26a
    注:同行不同小写字母表示4个林分密度之间差异显著(P<0.05)。Note:different letters in the same row denote significant difference among 4 tree densities at P<0.05 level.
    下载: 导出CSV

    表  2  林分密度和月份对土壤呼吸速率、土壤温度和土壤含水量影响的方差分析

    Table  2.   ANOVA of stand density and month effect on soil respiration rate, soil temperature and soil water content

    项目Item df 土壤呼吸速率Soil respiration rate(Rs) 土壤温度Soil temperature (T) 土壤含水量Soil water content (W)
    F P F P F P
    月份Month 6 953.641 <0.001 20 759.976 <0.001 63.637 <0.001
    林分密度Stand density 3 5.095 0.002 190.231 <0.001 40.585 <0.001
    月份×林分密度Month×stand density 18 3.175 <0.001 11.458 <0.001 7.774 <0.001
    下载: 导出CSV

    表  3  不同林分密度土壤呼吸与土壤温度和含水量的关系模型

    Table  3.   Relationship of soil respiration rate with soil temperature and water content with different stand densities

    样地编号
    Plot No.
    Rs=aebT Rs=aW+b Rs=aebTWc
    a b R2 a b R2 a b c R2
    P1 0.472 0.088 0.619 ** -0.013 2.962 0.299 1.986 0.087 -0.342 0.810 **
    P2 0.312 0.120 0.767 ** -0.007 2.420 0.070 0.651 0.119 -0.184 0.807 **
    P3 0.330 0.118 0.715 ** -0.006 2.428 0.031 0.572 0.116 -0.131 0.731 **
    P4 0.334 0.105 0.652 ** -0.013 2.268 0.119 1.550 0.104 -0.417 0.786 **
    注:**表示差异显著(P<0.001)。a, b, c为模型参数。Notes:** indicates significant difference(P<0.001). a, b, c are model parameters.
    下载: 导出CSV

    表  4  不同林分密度土壤呼吸的Q10值和生长季(2014年5—10月)土壤呼吸累积CO2排放量

    Table  4.   Q10 value and cumulative soil CO2-C efflux during the growing season with different stand densities

    样地编号
    Plot No.
    Q10 土壤呼吸累积CO2排放量/(t·hm-2)
    Cumulative soil CO2-C efflux /(t·ha-1)
    P1 2.41 5.27±0.25a
    P2 3.32 4.59±0.14b
    P3 3.25 4.39±0.11c
    P4 2.86 4.12±0.15d
    注:不同小写字母表示差异显著(P<0.05)。Note: different lowercase letters indicate significant difference (P<0.05).
    下载: 导出CSV

    表  5  生长季土壤累积CO2排放量与生物、非生物影响因子的逐步线性回归分析

    Table  5.   Stepwise linear regression analysis with cumulative soil CO2-C efflux, biotic and abiotic factors during the growing season

    回归方程Regression equation F R2 P
    y=0.008x1+0.002x2+2.974 25.786 0.851 <0.001
    y=-0.001x1+0.003x2-0.108x3+4.437 36.631 0.932 <0.001
    y=0.001x1+0.002x2-0.062x3+0.291x4+3.546 43.270 0.961 <0.001
    y=0.001x1+0.002x2-0.073x3+0.391x4-0.058x5+3.561 30.637 0.962 <0.001
    注:y为生长季土壤累积CO2排放量; x1为土壤有机碳含量; x2为微生物生物量碳含量; x3为生长季凋落物量; x4为土壤全氮含量; x5为土壤全磷含量, n=12。Notes: y, cumulative soil CO2-C efflux during the growing season; x1, soil organic carbon content; x2, microbial biomass carbon content; x3, litter biomass during the growing season; x4, soil total nitrogen content; x5, soil total phosphorus content, n=12.
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-02-06
  • 修回日期:  2017-03-20
  • 刊出日期:  2017-06-01

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