林业科学 ›› 2021, Vol. 57 ›› Issue (8): 13-23.doi: 10.11707/j.1001-7488.20210802
王梓璇1,王鼎2,赵鹏武3,4,张岐岳3,杨磊3,周梅3,4,*
收稿日期:
2020-01-25
出版日期:
2021-08-25
发布日期:
2021-09-30
通讯作者:
周梅
基金资助:
Zixuan Wang1,Ding Wang2,Pengwu Zhao3,4,Qiyue Zhang3,Lei Yang3,Mei Zhou3,4,*
Received:
2020-01-25
Online:
2021-08-25
Published:
2021-09-30
Contact:
Mei Zhou
摘要:
目的: 研究大兴安岭冻土区兴安落叶松林火烧迹地不同火烧木管理方式对土壤呼吸速率及组分的影响,探讨土壤呼吸与土壤温度和含水率的相关性,旨在为火烧后森林恢复与重建提供理论依据。方法: 以寒温带冻土区兴安落叶松林2009年火烧迹地为对象,使用LI-8100土壤呼吸速率测定系统,于2016和2017年生长季观测土壤呼吸速率,同时测定10 cm深处土壤温度和含水率季节变化,比较不同火烧木管理样地(火烧木皆伐,2009C;火烧木择伐,2009S;火烧木未伐,2009N)与对照样地(未火烧未采伐,2009CK)的土壤温度和含水率变化对土壤呼吸速率的影响。结果: 观测期内,4类样地土壤呼吸速率(RS)与土壤异养呼吸速率(RH)表现为2009S>2009N>2009CK>2009C;土壤自养呼吸速率(RA)2016年表现为2009N>2009S>2009CK>2009C,2017年表现为2009CK>2009N>2009S>2009C。4类样地均呈土壤异养呼吸速率贡献率(CH)大于自养呼吸速率贡献率(CA)。CA在对照样地最大(23.75%),在火烧木皆伐样地最小(16.04%),表现为2009CK>2009N>2009S>2009C。4类样地RS及其组分与10 cm深处土壤温度(T10)极显著正相关(P < 0.01)。火干扰降低了RS及其组分与10 cm深处土壤温度的敏感系数。结论: 在冻土区兴安落叶松林,火烧增加了RS与RH,火烧木择伐进一步增加了RS和RH(P > 0.05)。火烧木皆伐会降低RS及其组分,且2009C样地的土壤RA显著低于2009CK(P < 0.05)。火干扰降低了土壤自养呼吸速率贡献率,火烧木采伐对此进一步降低,且采伐强度越大时降低越多。4类样地土壤呼吸速率及其组分与10 cm深处土壤温度显著正相关(P < 0.01)。3类火烧木管理样地的土壤呼吸速率及其组分对温度的敏感度均低于对照样地。火烧迹地土壤呼吸速率及其组分与10 cm深处土壤含水率的正相关性不显著。
中图分类号:
王梓璇,王鼎,赵鹏武,张岐岳,杨磊,周梅. 寒温带冻土区火烧木管理方式对土壤呼吸及其组分的影响[J]. 林业科学, 2021, 57(8): 13-23.
Zixuan Wang,Ding Wang,Pengwu Zhao,Qiyue Zhang,Lei Yang,Mei Zhou. Effects of Management Methods of Burned Wood on Soil Respiration and Its Components in the Permafrost Region of Cold Temperate Zone[J]. Scientia Silvae Sinicae, 2021, 57(8): 13-23.
表1
样地概况①"
样地类型 Sample types | 郁闭度 Canopy density | 海拔 Altitude/m | 有机碳含量 Organic carbon content/(g·kg-1) | 全氮含量 Total nitrogen content/(g·kg-1) | C/N |
2009C | 0 | 817 | 81.40±1.93 b | 4.40±0.28 a | 18.55±1.47 a |
2009S | 0.2 | 821 | 66.00±2.69 c | 4.48±0.32 a | 14.79±1.22 b |
2009N | 0.5 | 819 | 65.65±1.71 c | 4.20±0.08 a | 15.66±0.66 b |
2009CK | 0.9 | 823 | 92.33±2.40 a | 4.59±0.07 a | 20.10±0.35 a |
表2
不同样地类型土壤呼吸组分贡献率①"
样地类型 Sample types | 2016 | 2017 | 2016—2017 | |||||
CA | CH | CA | CH | CA | CH | |||
2009C | 16.40±8.34 a | 83.60±8.34 a | 15.72±6.90 a | 84.28±6.90 a | 16.04±7.58 a | 83.96±7.58 a | ||
2009S | 20.00±10.29 ab | 80.00±10.29 ab | 19.50±7.70 ab | 80.50±7.70 ab | 19.74±8.97 ab | 80.26±8.97 ab | ||
2009N | 21.72±9.56 b | 78.28±9.56 b | 22.21±11.82 b | 77.79±11.82 b | 21.98±10.77 ab | 78.02±10.77 ab | ||
2009CK | 23.43±10.95 b | 76.57±10.95 b | 24.04±8.09 b | 75.96±8.09 b | 23.75±9.50 b | 76.25±9.50 b |
表3
不同样地类型土壤呼吸速率及其组分与土壤温度(T10)和土壤含水率(W10)的回归模型"
因子Factor | 样地类型 Sample types | 土壤呼吸组分 Soil respiration component | 回归方程 Regression equation | R2 | P |
T10 | 2009C | RS | RS=0.903 9e0.101 3 T10 | 0.73 | < 0.01 |
RH | RH=0.762 2e0.100 8 T10 | 0.71 | < 0.01 | ||
RA | RA =0.141 8e0.104 3 T10 | 0.65 | < 0.01 | ||
2009S | RS | RS=1.205 4e0.105 2 T10 | 0.77 | < 0.01 | |
RH | RH=0.947 8e0.107 6 T10 | 0.76 | < 0.01 | ||
RA | RA =0.258 5e0.095 6 T10 | 0.65 | < 0.01 | ||
2009N | RS | RS=1.385 4e0.102 8 T10 | 0.78 | < 0.01 | |
RH | RH=1.066 2e0.104 9 T10 | 0.80 | < 0.01 | ||
RA | RA =0.319 9e0.096 0 T10 | 0.57 | < 0.01 | ||
2009CK | RS | RS=1.055 6e0.127 3 T10 | 0.80 | < 0.01 | |
RH | RH=0.801 3e0.126 0 T10 | 0.83 | < 0.01 | ||
RA | RA =0.254 1e0.132 5 T10 | 0.66 | < 0.01 | ||
W10 | 2009C | RS | RS=0.000 9W102-0.077 4W10+3.596 2 | 0.14 | >0.05 |
RH | RH=0.000 8W102-0.064 2W10+2.861 2 | 0.17 | >0.05 | ||
RA | RA =0.000 1W102-0.013 2W10+0.735 0 | 0.02 | >0.05 | ||
2009S | RS | RS=0.000 9W102-0.065 6W10+3.772 8 | 0.14 | >0.05 | |
RH | RH=0.000 6W102-0.043 2W10+2.761 1 | 0.13 | >0.05 | ||
RA | RA =0.000 2W102-0.022 3W10+1.011 7 | 0.15 | >0.05 | ||
2009N | RS | RS=-0.000 4W102+0.093 5W10-1.050 4 | 0.13 | >0.05 | |
RH | RH=-0.000 2W102+0.067 8W10-0.781 4 | 0.16 | >0.05 | ||
RA | RA =-0.000 1W102+0.025 7W10-0.269 0 | 0.05 | >0.05 | ||
2009CK | RS | RS=-0.000 03W102+0.045 7W10+0.206 1 | 0.14 | >0.05 | |
RH | RH=0.000 04W102+0.027 6W10+0.296 1 | 0.15 | >0.05 | ||
RA | RA =-0.000 07W102+0.018 1W10-0.090 1 | 0.09 | >0.05 | ||
T10×W10 | 2009C | lnRS | lnRS= -0.043 9+0.105 8T10-0.003 6W10+0.000 1T10W10 | 0.83 | < 0.01 |
lnRH | lnRH= -0.223 1+0.093 4T10-0.003 4W10+0.000 3T10W10 | 0.81 | < 0.01 | ||
lnRA | lnRA= -1.866 4+0.160 5T10-0.004 6W10-0.000 6T10W10 | 0.84 | < 0.01 | ||
2009S | lnRS | lnRS= -0.346 8+0.126 9T10+0.003 0W10+0.000 05T10W10 | 0.88 | < 0.01 | |
lnRH | lnRH= -0.388 3+0.115 9T10-0.000 8W10+0.000 3T10W10 | 0.87 | < 0.01 | ||
lnRA | lnRA= -2.860 7+0.183 8T10+0.018 7W10-0.001 1T10W10 | 0.74 | < 0.01 | ||
2009N | lnRS | lnRS= -0.132 7+0.154 8T10+0.001 7W10-0.000 3T10W10 | 0.85 | < 0.01 | |
lnRH | lnRH= -0.427 2+0.150 7T10+0.001 7W10-0.000 2T10W10 | 0.85 | < 0.01 | ||
lnRA | lnRA= -1.487 3+0.165 8T10+0.000 3W10-0.000 6T10W10 | 0.71 | < 0.01 | ||
2009CK | lnRS | lnRS= -1.349 8+0.267 1T10+0.018 8W10-0.001 9T10W10 | 0.85 | < 0.01 | |
lnRH | lnRH= -1.542 3+0.253 7T10+0.017 5W10-0.001 7T10W10 | 0.85 | < 0.01 | ||
lnRA | lnRA=-3.049 1+0.308 2T10+0.022 1W10-0.002 3T10W10 | 0.77 | < 0.01 |
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