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尾巨桉人工林土壤呼吸对林下植被管理措施的响应

竹万宽 许宇星 王志超 杜阿朋

竹万宽, 许宇星, 王志超, 杜阿朋. 尾巨桉人工林土壤呼吸对林下植被管理措施的响应[J]. 浙江农林大学学报. doi: 10.11833/j.issn.2095-0756.20220138
引用本文: 竹万宽, 许宇星, 王志超, 杜阿朋. 尾巨桉人工林土壤呼吸对林下植被管理措施的响应[J]. 浙江农林大学学报. doi: 10.11833/j.issn.2095-0756.20220138
ZHU Wankuan, XU Yuxing, WANG Zhichao, DU Apeng. Response of soil respiration to understory vegetation management in Eucalyptus urophylla × E. grandis plantation[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20220138
Citation: ZHU Wankuan, XU Yuxing, WANG Zhichao, DU Apeng. Response of soil respiration to understory vegetation management in Eucalyptus urophylla × E. grandis plantation[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20220138

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尾巨桉人工林土壤呼吸对林下植被管理措施的响应

doi: 10.11833/j.issn.2095-0756.20220138
基金项目: 广东省林业科技创新项目(2018KJCX014);广东林业生态定位监测网络平台建设项目(2021CG535);林草科技创新平台运行项目(2022132113)
详细信息
    作者简介: 竹万宽(ORCID: 0000-0002-4344-1688),从事森林生态系统定位观测研究。E-mail: zwk_2015@163.com
    通信作者: 杜阿朋(ORCID: 0000-0001-7010-5674),副研究员,博士,从事森林生态学研究。E-mail: dapzj@163.com
  • 中图分类号: S714.5

Response of soil respiration to understory vegetation management in Eucalyptus urophylla × E. grandis plantation

  • 摘要:   目的  探究不同林下植被管理措施对雷州半岛尾巨桉Eucalyptus urophylla × E. grandis人工林土壤呼吸及其组分的影响,为准确评估桉树人工林土壤碳循环提供科学依据。  方法  以尾巨桉人工林为研究对象,实施物理和化学(施用除草剂)方式去除林下植被,并以未去除为对照。采用LI-8100A土壤碳通量自动测量系统,对土壤总呼吸及其组分速率、土壤温度和湿度(5 cm深处)进行为期1 a的连续监测。  结果  物理和化学去除林下植被极显著降低了土壤总呼吸及其组分(化学去除的根系呼吸除外)(P<0.01),且物理去除的土壤总呼吸速率(3.45 μmol·m−2·s−1)显著低于化学去除(4.15 μmol·m−2·s−1)(P<0.01)。2种方式的矿质土壤呼吸速率和凋落物层呼吸速率无显著差异(P>0.05),根系呼吸速率表现为物理去除(1.02 μmol·m−2·s−1)显著低于化学去除(1.37 μmol·m−2·s−1)(P<0.05)。凋落物层呼吸、矿质土壤呼吸、根系呼吸对土壤总呼吸的贡献率分别为36.45%~39.40%、26.34%~31.29%、30.10%~39.40%。土壤总呼吸速率及其组分最高值出现在雨季(4—10月),根系呼吸速率最低值出现在7—8月。土壤总呼吸速率与土壤温度、湿度双因子拟合模型最优,能解释土壤总呼吸速率变异的75.1%(物理去除)、60.9%(化学去除)、57.1%(对照);凋落物呼吸速率时间变异主要由土壤湿度调控;根系呼吸速率与土壤温度无显著相关性,与土壤湿度呈显著负相关(P<0.05)。土壤总呼吸的温度敏感性(Q10)从大到小依次为物理去除(2.12)、化学去除(1.95)、对照(1.93)。  结论  林下植被去除通过改变林内生物和非生物因素共同作用于土壤呼吸,且物理去除林下植被相比于化学去除能更大程度降低桉树人工林土壤总呼吸速率,降低森林土壤碳排放。图4表3参49
  • 图  1  不同林下植被处理方式土壤呼吸及其组分月动态

    Figure  1  Inter-monthly change of soil respiration and its components in different understory treatments

    图  2  不同林下植被处理方式土壤温度和湿度月动态

    Figure  2  Inter-monthly change of soil temperature and moisture in different understory treatments

    图  3  土壤呼吸速率与土壤温度关系模型

    Figure  3  Relation model of soil respiration and soil temperature

    图  4  土壤呼吸速率与土壤湿度关系模型

    Figure  4  Relation model of soil respiration and soil moisture

    表  1  试验地基本概况

    Table  1.   Survey of sample plots

    采样时间(年-月)处理有机碳/(g·kg−1)全氮/(g·kg−1)全磷/(g·kg−1)pH
    2017-1233.37±0.30 a2.50±0.06 a0.89±0.01 a4.48±0.02 a
    2019-03物理30.03±0.73 b2.09±0.08 b0.85±0.01 ab3.97±0.01 c
    化学32.65±0.52 a2.54±0.06 a0.80±0.04 b4.12±0.01 b
    对照33.76±0.58 a2.48±0.09 a0.90±0.02 a4.40±0.01 a
      说明:数值均为0~20 cm土层均值±标准误。不同小写字母表示不同处理间差异显著(P<0.05);−表示林下植被去除处理之前的本底调查
    下载: 导出CSV

    表  2  土壤呼吸及其组分、土壤温湿度、土壤有机碳储量平均值多重比较

    Table  2.   One way ANOVA for the means of soil respiration components, soil temperature, soil moisture, and soil organic carbon storage

    处理RA/
    (μmol·m−2·s−1)
    RMRRRLT1/℃
    数值/
    (μmol·m−2·s−1)
    贡献率/%数值/
    (μmol·m−2·s−1)
    贡献率/%数值/
    (μmol·m−2·s−1)
    贡献率/%
    物理3.45±0.14 C1.04±0.06 B31.29±1.56 A1.02±0.07 B32.26±2.28 A1.39±0.13 B36.45±2.28 A24.32±0.36 Aa
    化学4.15±0.15 B1.11±0.06 B26.34±1.08 B1.37±0.11 A35.26±2.76 A1.67±0.13 B38.39±2.57 A24.94±0.39 Aa
    对照5.17±0.23 A1.61±0.12 A30.51±1.65 A1.37±0.09 A30.10±2.27 A2.19±0.17 A39.40±1.83 A25.28±0.41 Aa
    处理T2/℃T3/℃W1/%W2/%W3/%SOCs1/
    (t·hm−2)
    SOCs2/
    (t·hm−2)
    SOCs3/
    (t·hm−2)
    物理24.56±0.36 Aa24.00±0.32 Aa18.00±0.75 Bc20.86±0.83 Ab24.03±0.94 Aa55.93±1.19 Cb63.02±0.76 Ba55.18±0.47 Cb
    化学24.00±0.33 Aa24.39±0.35 Aa18.45±0.75 Bb21.47±0.89 Aa21.60±0.81 Aa59.46±0.72 Bb65.66±0.38 Aa62.89±1.14 Ba
    对照24.80±0.36 Aa24.53±0.33 Aa22.80±0.90 Aa20.50±0.90 Aa22.42±0.89 Aa63.98±0.95 Ab61.60±0.85 Bb69.01±0.69 Aa
      说明:不同大写字母表示不同林下植被处理方式间差异显著(P<0.05),不同小写字母表示不同试验小区间差异显著(P<0.05)。RARMRRRL分别为土壤总呼吸速率、矿质土壤呼吸速率、根系呼吸速率、凋落物层呼吸速率。T1T2T3分别表示断根去凋小区、去凋小区、对照小区土壤温度。W1W2W3分别表示断根去凋小区、去凋小区、对照小区土壤湿度。SOCs1、SOCs2、SOCs3分别表示断根去凋小区、去凋小区、对照小区0~20 cm土壤有机碳储量。数值为平均值±标准误
    下载: 导出CSV

    表  3  土壤呼吸速率与土壤温度、湿度叠加效应模型的拟合参数

    Table  3.   Relation model of soil respiration against soil temperature and soil moisture

    项目物理化学对照
    αβγδεαβγδεαβγδε
    矿质土壤呼吸数值2.199−0.3449.4200.009−22.165−2.2610.0555.7280.001−10.379−4.4400.13612.418−0.001−17.571
    标准误1.4320.1193.8710.0039.0521.2870.1033.3430.0027.4361.4840.1203.0920.0036.010
    R20.3180.4580.617
    P<0.001<0.001<0.001
    根系呼吸数值−9.3040.7217.645−0.015−21.526−0.9330.0226.0230.001−16.117−2.2910.1527.296−0.003−21.126
    标准误2.0160.1674.5390.0049.2884.2590.3627.7590.00815.1883.5620.2946.0640.00612.192
    R20.3430.0430.124
    P<0.0010.510<0.05
    凋落物层呼吸数值0.637−0.172−1.3950.00512.206−4.3340.315−6.974−0.00519.9062.809−0.2872.9570.0062.835
    标准误2.3860.2063.8790.0057.2633.4800.2906.3260.00612.4514.2070.3495.7580.00810.948
    R20.5940.3290.261
    P<0.001<0.001<0.001
    土壤总呼吸数值−0.7090.0642.6360.001−2.196−2.1150.2390.184−0.0041.2630.3030.0014.3120.001−4.640
    标准误0.7640.0661.2420.0012.3260.8630.0721.5680.0023.0861.3720.1141.8780.0023.571
    R20.7510.6090.571
    P<0.001<0.001<0.001
      说明:R2表示关系模型的拟合优度,即决定系数
    下载: 导出CSV
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  • 收稿日期:  2022-01-25
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尾巨桉人工林土壤呼吸对林下植被管理措施的响应

doi: 10.11833/j.issn.2095-0756.20220138
    基金项目:  广东省林业科技创新项目(2018KJCX014);广东林业生态定位监测网络平台建设项目(2021CG535);林草科技创新平台运行项目(2022132113)
    作者简介:

    竹万宽(ORCID: 0000-0002-4344-1688),从事森林生态系统定位观测研究。E-mail: zwk_2015@163.com

    通信作者: 杜阿朋(ORCID: 0000-0001-7010-5674),副研究员,博士,从事森林生态学研究。E-mail: dapzj@163.com
  • 中图分类号: S714.5

摘要:   目的  探究不同林下植被管理措施对雷州半岛尾巨桉Eucalyptus urophylla × E. grandis人工林土壤呼吸及其组分的影响,为准确评估桉树人工林土壤碳循环提供科学依据。  方法  以尾巨桉人工林为研究对象,实施物理和化学(施用除草剂)方式去除林下植被,并以未去除为对照。采用LI-8100A土壤碳通量自动测量系统,对土壤总呼吸及其组分速率、土壤温度和湿度(5 cm深处)进行为期1 a的连续监测。  结果  物理和化学去除林下植被极显著降低了土壤总呼吸及其组分(化学去除的根系呼吸除外)(P<0.01),且物理去除的土壤总呼吸速率(3.45 μmol·m−2·s−1)显著低于化学去除(4.15 μmol·m−2·s−1)(P<0.01)。2种方式的矿质土壤呼吸速率和凋落物层呼吸速率无显著差异(P>0.05),根系呼吸速率表现为物理去除(1.02 μmol·m−2·s−1)显著低于化学去除(1.37 μmol·m−2·s−1)(P<0.05)。凋落物层呼吸、矿质土壤呼吸、根系呼吸对土壤总呼吸的贡献率分别为36.45%~39.40%、26.34%~31.29%、30.10%~39.40%。土壤总呼吸速率及其组分最高值出现在雨季(4—10月),根系呼吸速率最低值出现在7—8月。土壤总呼吸速率与土壤温度、湿度双因子拟合模型最优,能解释土壤总呼吸速率变异的75.1%(物理去除)、60.9%(化学去除)、57.1%(对照);凋落物呼吸速率时间变异主要由土壤湿度调控;根系呼吸速率与土壤温度无显著相关性,与土壤湿度呈显著负相关(P<0.05)。土壤总呼吸的温度敏感性(Q10)从大到小依次为物理去除(2.12)、化学去除(1.95)、对照(1.93)。  结论  林下植被去除通过改变林内生物和非生物因素共同作用于土壤呼吸,且物理去除林下植被相比于化学去除能更大程度降低桉树人工林土壤总呼吸速率,降低森林土壤碳排放。图4表3参49

English Abstract

竹万宽, 许宇星, 王志超, 杜阿朋. 尾巨桉人工林土壤呼吸对林下植被管理措施的响应[J]. 浙江农林大学学报. doi: 10.11833/j.issn.2095-0756.20220138
引用本文: 竹万宽, 许宇星, 王志超, 杜阿朋. 尾巨桉人工林土壤呼吸对林下植被管理措施的响应[J]. 浙江农林大学学报. doi: 10.11833/j.issn.2095-0756.20220138
ZHU Wankuan, XU Yuxing, WANG Zhichao, DU Apeng. Response of soil respiration to understory vegetation management in Eucalyptus urophylla × E. grandis plantation[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20220138
Citation: ZHU Wankuan, XU Yuxing, WANG Zhichao, DU Apeng. Response of soil respiration to understory vegetation management in Eucalyptus urophylla × E. grandis plantation[J]. Journal of Zhejiang A&F University. doi: 10.11833/j.issn.2095-0756.20220138

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