植物生态学报 ›› 2007, Vol. 31 ›› Issue (1): 56-65.DOI: 10.17521/cjpe.2007.0008
龚伟(), 胡庭兴, 王景燕, 宫渊波, 冉华, 张世熔, 廖尔华
收稿日期:
2005-12-12
接受日期:
2006-03-28
出版日期:
2007-12-12
发布日期:
2007-01-30
作者简介:
E-mail: gongwei@sicau.edu.cn
基金资助:
GONG Wei(), HU Ting-Xing, WANG Jing-Yan, GONG Yuan-Bo, RAN Hua, ZHANG Shi-Rong, LIAO Er-Hua
Received:
2005-12-12
Accepted:
2006-03-28
Online:
2007-12-12
Published:
2007-01-30
摘要:
运用分形模型研究了川南天然常绿阔叶林及其人工更新成檫木(Sassafras tzumu)林、柳杉(Cryptomeria fortunei)林和水杉(Metasequoia glyptostroboides)林后土壤团粒结构,探讨了分形维数与林地土壤水源涵养功能、肥力特征和微生物数量之间的关系。结果表明:天然常绿阔叶林人工更新后土壤团粒结构的分形维数和结构体破坏率增大、土壤物理性质变差、养分含量和微生物数量降低,3种人工林中,檫木林较好、水杉林次之、柳杉林最差;土壤团聚体、水稳性团聚体和水稳性大团聚体含量越高分形维数越小;在湿筛条件下,土壤结构体破坏率随分形维数的降低而减小;土壤团粒结构的分形维数与土壤物理性质、养分含量和微生物数量之间存在显著的回归关系。这表明天然常绿阔叶林人工更新后由于不同林分对林地土壤组成结构的维护效果不同,导致更新后林地土壤物理、化学和生物性质变化,林地土壤团粒结构的变化,进而影响其分形维数的大小。因此,分形维数可作为天然常绿阔叶林及其人工更新后林地土壤水源涵养功能、肥力特征和微生物活动情况的一项综合性定量化评价指标。同时,为保护天然常绿阔叶林、选择适宜的更新树种和天然常绿阔叶林人工更新后林地土壤的科学管理提供依据,也为退耕还林中树种的选择提供参考。
龚伟, 胡庭兴, 王景燕, 宫渊波, 冉华, 张世熔, 廖尔华. 川南天然常绿阔叶林人工更新后土壤团粒结构的分形特征. 植物生态学报, 2007, 31(1): 56-65. DOI: 10.17521/cjpe.2007.0008
GONG Wei, HU Ting-Xing, WANG Jing-Yan, GONG Yuan-Bo, RAN Hua, ZHANG Shi-Rong, LIAO Er-Hua. STUDY ON FRACTAL FEATURES OF SOIL AGGREGATE STRUCTURE UNDER NATURAL EVERGREEN BROADLEAVED FOREST AND ARTIFICIAL REGENERATION IN SOUTHERN SICHUAN PROVINCE. Chinese Journal of Plant Ecology, 2007, 31(1): 56-65. DOI: 10.17521/cjpe.2007.0008
林分类型 Forest type | 土层 Soil layer (cm) | 团聚体大小 Cluster composition size (mm) | 结构体破 坏率5)(%) | 分形 维数6) | 相关 系数7) | ||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
>5 | 5~2 | 2~1 | 1~0.5 | 0.5~0.25 | >0.25 | ||||||||||||||||||||||||||||||
天然常绿阔叶林1) | 0~20 | 54.499 62.593 | 17.387 18.745 | 9.134 6.587 | 7.113 6.877 | 2.829 2.602 | 90.962 97.404 | 6.614 | 2.415 2.120 | 0.980 0.994 | |||||||||||||||||||||||||
20~40 | 63.765 68.106 | 13.345 14.547 | 5.702 5.441 | 4.729 5.974 | 2.154 2.867 | 89.695 96.935 | 7.469 | 2.473 2.183 | 0.945 0.987 | ||||||||||||||||||||||||||
檫木林2) | 0~20 | 63.163 70.707 | 12.754 16.200 | 6.334 4.269 | 5.322 3.909 | 2.220 1.697 | 89.793 96.782 | 7.221 | 2.469 2.184 | 0.951 0.971 | |||||||||||||||||||||||||
20~40 | 50.844 62.877 | 16.723 18.879 | 8.725 5.433 | 8.118 5.403 | 3.601 2.613 | 88.011 95.205 | 7.556 | 2.489 2.274 | 0.981 0.980 | ||||||||||||||||||||||||||
柳杉林3) | 0~20 | 21.743 63.017 | 18.688 16.638 | 13.363 5.504 | 17.377 6.523 | 10.411 3.343 | 81.582 95.025 | 14.147 | 2.579 2.293 | 0.992 0.984 | |||||||||||||||||||||||||
20~40 | 4.209 67.510 | 9.695 16.183 | 7.684 4.533 | 21.672 4.281 | 18.828 2.435 | 62.088 94.942 | 34.604 | 2.764 2.301 | 0.946 0.967 | ||||||||||||||||||||||||||
水杉林4) | 0~20 | 54.612 60.158 | 14.753 17.587 | 7.817 6.637 | 6.923 8.040 | 3.536 3.563 | 87.641 95.985 | 8.693 | 2.506 2.235 | 0.972 0.993 | |||||||||||||||||||||||||
20~40 | 38.673 70.397 | 15.876 14.209 | 11.655 4.206 | 11.826 4.516 | 6.123 2.451 | 84.153 95.779 | 12.138 | 2.551 2.265 | 0.994 0.969 |
表1 天然常绿阔叶林人工更新后土壤团聚体组成(%)
Table 1 Composition of soil aggregates under natural evergreen broadleaved forest and artificial regeneration
林分类型 Forest type | 土层 Soil layer (cm) | 团聚体大小 Cluster composition size (mm) | 结构体破 坏率5)(%) | 分形 维数6) | 相关 系数7) | ||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
>5 | 5~2 | 2~1 | 1~0.5 | 0.5~0.25 | >0.25 | ||||||||||||||||||||||||||||||
天然常绿阔叶林1) | 0~20 | 54.499 62.593 | 17.387 18.745 | 9.134 6.587 | 7.113 6.877 | 2.829 2.602 | 90.962 97.404 | 6.614 | 2.415 2.120 | 0.980 0.994 | |||||||||||||||||||||||||
20~40 | 63.765 68.106 | 13.345 14.547 | 5.702 5.441 | 4.729 5.974 | 2.154 2.867 | 89.695 96.935 | 7.469 | 2.473 2.183 | 0.945 0.987 | ||||||||||||||||||||||||||
檫木林2) | 0~20 | 63.163 70.707 | 12.754 16.200 | 6.334 4.269 | 5.322 3.909 | 2.220 1.697 | 89.793 96.782 | 7.221 | 2.469 2.184 | 0.951 0.971 | |||||||||||||||||||||||||
20~40 | 50.844 62.877 | 16.723 18.879 | 8.725 5.433 | 8.118 5.403 | 3.601 2.613 | 88.011 95.205 | 7.556 | 2.489 2.274 | 0.981 0.980 | ||||||||||||||||||||||||||
柳杉林3) | 0~20 | 21.743 63.017 | 18.688 16.638 | 13.363 5.504 | 17.377 6.523 | 10.411 3.343 | 81.582 95.025 | 14.147 | 2.579 2.293 | 0.992 0.984 | |||||||||||||||||||||||||
20~40 | 4.209 67.510 | 9.695 16.183 | 7.684 4.533 | 21.672 4.281 | 18.828 2.435 | 62.088 94.942 | 34.604 | 2.764 2.301 | 0.946 0.967 | ||||||||||||||||||||||||||
水杉林4) | 0~20 | 54.612 60.158 | 14.753 17.587 | 7.817 6.637 | 6.923 8.040 | 3.536 3.563 | 87.641 95.985 | 8.693 | 2.506 2.235 | 0.972 0.993 | |||||||||||||||||||||||||
20~40 | 38.673 70.397 | 15.876 14.209 | 11.655 4.206 | 11.826 4.516 | 6.123 2.451 | 84.153 95.779 | 12.138 | 2.551 2.265 | 0.994 0.969 |
林分类型 Forest type | 土层 (cm) Soil layer | 自然含 水率5)(%) | 容重6) (g·cm-3) | 毛管孔隙7) (%) | 非毛管 孔隙8)(%) | 初渗系数9) k10(mm·min-1) | 稳渗系数10) k10(mm·min-1) |
---|---|---|---|---|---|---|---|
天然常绿阔叶林1) | 0~20 | 132.9±8.4 | 0.48±0.05 | 64.3±4.9 | 9.5±1.4 | 5.76±2.29 | 1.39±0.95 |
20~40 | 112.0±5.7 | 0.59±0.02 | 62.0±3.2 | 7.8±3.1 | 4.76±3.07 | 1.19±0.37 | |
檫木林2) | 0~20 | 100.8±6.9 | 0.75±0.08 | 58.8±6.0 | 8.5±4.2 | 4.97±2.63 | 0.98±0.45 |
20~40 | 81.9±5.1 | 0.78±0.03 | 57.4±3.5 | 7.4±4.6 | 3.55±1.03 | 0.85±0.47 | |
柳杉林3) | 0~20 | 48.5±3.5 | 0.92±0.13 | 50.6±3.2 | 7.6±5.7 | 2.51±1.74 | 0.58±0.31 |
20~40 | 38.1±4.4 | 1.27±0.10 | 41.2±3.4 | 4.6±1.9 | 2.10±1.16 | 0.26±0.17 | |
水杉林4) | 0~20 | 87.5±5.2 | 0.71±0.15 | 57.6±10.6 | 8.0±5.0 | 3.15±2.52 | 0.94±0.32 |
20~40 | 69.4±4.1 | 0.84±0.01 | 56.6±3.3 | 7.4±1.5 | 2.72±1.16 | 0.79±0.54 |
表2 天然常绿阔叶林人工更新后土壤物理性质
Table 2 Soil physical properties under natural evergreen broadleaved forest and artificial regeneration
林分类型 Forest type | 土层 (cm) Soil layer | 自然含 水率5)(%) | 容重6) (g·cm-3) | 毛管孔隙7) (%) | 非毛管 孔隙8)(%) | 初渗系数9) k10(mm·min-1) | 稳渗系数10) k10(mm·min-1) |
---|---|---|---|---|---|---|---|
天然常绿阔叶林1) | 0~20 | 132.9±8.4 | 0.48±0.05 | 64.3±4.9 | 9.5±1.4 | 5.76±2.29 | 1.39±0.95 |
20~40 | 112.0±5.7 | 0.59±0.02 | 62.0±3.2 | 7.8±3.1 | 4.76±3.07 | 1.19±0.37 | |
檫木林2) | 0~20 | 100.8±6.9 | 0.75±0.08 | 58.8±6.0 | 8.5±4.2 | 4.97±2.63 | 0.98±0.45 |
20~40 | 81.9±5.1 | 0.78±0.03 | 57.4±3.5 | 7.4±4.6 | 3.55±1.03 | 0.85±0.47 | |
柳杉林3) | 0~20 | 48.5±3.5 | 0.92±0.13 | 50.6±3.2 | 7.6±5.7 | 2.51±1.74 | 0.58±0.31 |
20~40 | 38.1±4.4 | 1.27±0.10 | 41.2±3.4 | 4.6±1.9 | 2.10±1.16 | 0.26±0.17 | |
水杉林4) | 0~20 | 87.5±5.2 | 0.71±0.15 | 57.6±10.6 | 8.0±5.0 | 3.15±2.52 | 0.94±0.32 |
20~40 | 69.4±4.1 | 0.84±0.01 | 56.6±3.3 | 7.4±1.5 | 2.72±1.16 | 0.79±0.54 |
项目 Item | 拟合回归方程Linear regression equation | 相关系数Correlation coefficient | ||
---|---|---|---|---|
湿筛Wet sieving | 干筛Dry sieving | 湿筛Wet sieving | 干筛Dry sieving | |
自然含水率1) | D=2.780 8-0.003 0 X | D=2.393 0-0.001 9 X | -0.884 9** | -0.953 9** |
容重2) | D=2.185 7+0.435 4 X | D=2.053 9+0.224 6 X | 0.966 0** | 0.833 7** |
毛管孔隙3) | D=3.339 8-0.014 4 X | D=2.634 2-0.007 2 X | -0.975 6** | -0.811 7* |
非毛管孔隙4) | D=3.081 3-0.072 4 X | D=2.501 8-0.035 5 X | -0.947 7** | -0.777 5* |
初渗系数5) | D=2.774 5-0.066 1 X | D=2.402 8-0.046 3 X | -0.816 9* | -0.958 2** |
稳渗系数6) | D=2.780 7-0.286 4 X | D=2.377 4-0.166 8 X | -0.934 9** | -0.911 0** |
表3 分形维数与土壤物理性质的关系
Table 3 Relationship between fractal dimension and soil physical properties
项目 Item | 拟合回归方程Linear regression equation | 相关系数Correlation coefficient | ||
---|---|---|---|---|
湿筛Wet sieving | 干筛Dry sieving | 湿筛Wet sieving | 干筛Dry sieving | |
自然含水率1) | D=2.780 8-0.003 0 X | D=2.393 0-0.001 9 X | -0.884 9** | -0.953 9** |
容重2) | D=2.185 7+0.435 4 X | D=2.053 9+0.224 6 X | 0.966 0** | 0.833 7** |
毛管孔隙3) | D=3.339 8-0.014 4 X | D=2.634 2-0.007 2 X | -0.975 6** | -0.811 7* |
非毛管孔隙4) | D=3.081 3-0.072 4 X | D=2.501 8-0.035 5 X | -0.947 7** | -0.777 5* |
初渗系数5) | D=2.774 5-0.066 1 X | D=2.402 8-0.046 3 X | -0.816 9* | -0.958 2** |
稳渗系数6) | D=2.780 7-0.286 4 X | D=2.377 4-0.166 8 X | -0.934 9** | -0.911 0** |
林分类型 Forest type | 土层 Soil layer (cm) | 有机质 Organic matter (g·kg-1) | 全氮 Total-N (g·kg-1) | 碱解氮 Hydrolysis-N (mg·kg-1) | 全磷 Total-P (mg·kg-1) | 速效磷 Available-P (mg·kg-1) | 全钾 Total-K (g·kg-1) | 速效钾 Available-K (mg·kg-1) |
---|---|---|---|---|---|---|---|---|
天然常绿 | 0~20 | 115.8±6.7 | 1.40±0.15 | 236.9±20.4 | 243.5±16.4 | 2.07±0.19 | 31.4±2.2 | 47.3±5.9 |
阔叶林1) | 20~40 | 64.3±4.9 | 0.84±0.07 | 157.9±16.8 | 214.8±15.5 | 1.16±0.08 | 31.1±1.9 | 31.9±3.2 |
檫木林2) | 0~20 | 89.2±6.0 | 1.22±0.05 | 178.7±12.9 | 236.6±12.1 | 1.62±0.10 | 30.6±1.1 | 45.6±6.3 |
20~40 | 52.0±5.2 | 0.76±0.11 | 145.4±7.7 | 188.9±9.0 | 0.98±0.15 | 28.3±2.5 | 26.4±2.3 | |
柳杉林3) | 0~20 | 30.9±3.0 | 0.59±0.02 | 92.7±4.3 | 195.6±12.1 | 0.83±0.08 | 22.5±1.7 | 30.8±3.9 |
20~40 | 17.8±4.4 | 0.30±0.01 | 52.4±5.0 | 139.4±6.8 | 0.67±0.13 | 20.8±2.5 | 20.6±1.8 | |
水杉林4) | 0~20 | 75.1±7.3 | 1.13±0.14 | 163.6±10.7 | 223.9±12.2 | 1.29±0.07 | 29.9±1.8 | 41.3±4.6 |
20~40 | 38.2±5.9 | 0.57±0.06 | 90.3±7.9 | 179.3±18.2 | 0.79±0.05 | 24.3±1.4 | 24.7±1.7 |
表4 天然常绿阔叶林人工更新后土壤养分含量
Table 4 Soil nutrient content under natural evergreen broadleaved forest and artificial regeneration
林分类型 Forest type | 土层 Soil layer (cm) | 有机质 Organic matter (g·kg-1) | 全氮 Total-N (g·kg-1) | 碱解氮 Hydrolysis-N (mg·kg-1) | 全磷 Total-P (mg·kg-1) | 速效磷 Available-P (mg·kg-1) | 全钾 Total-K (g·kg-1) | 速效钾 Available-K (mg·kg-1) |
---|---|---|---|---|---|---|---|---|
天然常绿 | 0~20 | 115.8±6.7 | 1.40±0.15 | 236.9±20.4 | 243.5±16.4 | 2.07±0.19 | 31.4±2.2 | 47.3±5.9 |
阔叶林1) | 20~40 | 64.3±4.9 | 0.84±0.07 | 157.9±16.8 | 214.8±15.5 | 1.16±0.08 | 31.1±1.9 | 31.9±3.2 |
檫木林2) | 0~20 | 89.2±6.0 | 1.22±0.05 | 178.7±12.9 | 236.6±12.1 | 1.62±0.10 | 30.6±1.1 | 45.6±6.3 |
20~40 | 52.0±5.2 | 0.76±0.11 | 145.4±7.7 | 188.9±9.0 | 0.98±0.15 | 28.3±2.5 | 26.4±2.3 | |
柳杉林3) | 0~20 | 30.9±3.0 | 0.59±0.02 | 92.7±4.3 | 195.6±12.1 | 0.83±0.08 | 22.5±1.7 | 30.8±3.9 |
20~40 | 17.8±4.4 | 0.30±0.01 | 52.4±5.0 | 139.4±6.8 | 0.67±0.13 | 20.8±2.5 | 20.6±1.8 | |
水杉林4) | 0~20 | 75.1±7.3 | 1.13±0.14 | 163.6±10.7 | 223.9±12.2 | 1.29±0.07 | 29.9±1.8 | 41.3±4.6 |
20~40 | 38.2±5.9 | 0.57±0.06 | 90.3±7.9 | 179.3±18.2 | 0.79±0.05 | 24.3±1.4 | 24.7±1.7 |
项目 Item | 拟合回归方程Linear regression equation | 相关系数Correlation coefficient | ||
---|---|---|---|---|
湿筛Wet sieving | 干筛Dry sieving | 湿筛Wet sieving | 干筛Dry sieving | |
有机质Organic matter | D=2.696 5-0.002 7 X | D=2.342 9-0.001 8 X | -0.832 8* | -0.933 5** |
全氮Total-N | D=2.736 6-0.241 8 X | D=2.358 4-0.148 7 X | -0.843 6** | -0.867 8** |
碱解氮Hydrolysis-N | D=2.757 2-0.001 6 X | D=2.369 8-0.001 0 X | -0.890 4** | -0.907 5** |
全磷Total-P | D=3.100 2-0.002 8 X | D=2.550 1-0.001 6 X | -0.896 9** | -0.840 8** |
速效磷Available-P | D=2.730 5-0.169 9 X | D=2.379 4-0.125 4 X | -0.752 9* | -0.930 4** |
全钾Total-K | D=3.150 6-0.022 7 X | D=2.583 2-0.012 8 X | -0.892 1** | -0.846 1** |
速效钾Available-K | D=2.792 3-0.007 8 X | D=2.407 4-0.005 2 X | -0.729 3* | -0.818 8* |
表5 分形维数与土壤养分的关系
Table 5 Relationship between fractal dimension and soil nutrient content
项目 Item | 拟合回归方程Linear regression equation | 相关系数Correlation coefficient | ||
---|---|---|---|---|
湿筛Wet sieving | 干筛Dry sieving | 湿筛Wet sieving | 干筛Dry sieving | |
有机质Organic matter | D=2.696 5-0.002 7 X | D=2.342 9-0.001 8 X | -0.832 8* | -0.933 5** |
全氮Total-N | D=2.736 6-0.241 8 X | D=2.358 4-0.148 7 X | -0.843 6** | -0.867 8** |
碱解氮Hydrolysis-N | D=2.757 2-0.001 6 X | D=2.369 8-0.001 0 X | -0.890 4** | -0.907 5** |
全磷Total-P | D=3.100 2-0.002 8 X | D=2.550 1-0.001 6 X | -0.896 9** | -0.840 8** |
速效磷Available-P | D=2.730 5-0.169 9 X | D=2.379 4-0.125 4 X | -0.752 9* | -0.930 4** |
全钾Total-K | D=3.150 6-0.022 7 X | D=2.583 2-0.012 8 X | -0.892 1** | -0.846 1** |
速效钾Available-K | D=2.792 3-0.007 8 X | D=2.407 4-0.005 2 X | -0.729 3* | -0.818 8* |
林分类型 Forest type | 土层(cm) Soil layer | 细菌Bacteria (106·g-1干土) | 真菌Fungi (103·g-1干土) | 放线菌5) (103·g-1干土) | 微生物总数6) (106·g-1干土) |
---|---|---|---|---|---|
天然常绿阔叶林1) | 0~20 | 9.25±1.13 | 4.89±0.63 | 11.91±1.43 | 9.26 |
20~40 | 7.45±0.82 | 1.55±0.21 | 4.64±0.48 | 7.45 | |
檫木林2) | 0~20 | 6.10±1.02 | 3.48±0.75 | 8.12±1.16 | 6.11 |
20~40 | 5.98±0.48 | 0.96±0.11 | 3.82±0.42 | 5.98 | |
柳杉林3) | 0~20 | 3.96±0.44 | 1.63±0.29 | 5.69±0.88 | 3.97 |
20~40 | 3.88±0.28 | 0.14±0.02 | 1.71±0.15 | 3.88 | |
水杉林4) | 0~20 | 5.96±1.01 | 2.81±0.45 | 7.76±1.34 | 5.97 |
20~40 | 5.05±0.54 | 0.72±0.09 | 3.53±0.31 | 5.05 |
表6 天然常绿阔叶林人工更新后土壤微生物数量
Table 6 Soil microbe number under natural evergreen broadleaved forest and artificial regeneration
林分类型 Forest type | 土层(cm) Soil layer | 细菌Bacteria (106·g-1干土) | 真菌Fungi (103·g-1干土) | 放线菌5) (103·g-1干土) | 微生物总数6) (106·g-1干土) |
---|---|---|---|---|---|
天然常绿阔叶林1) | 0~20 | 9.25±1.13 | 4.89±0.63 | 11.91±1.43 | 9.26 |
20~40 | 7.45±0.82 | 1.55±0.21 | 4.64±0.48 | 7.45 | |
檫木林2) | 0~20 | 6.10±1.02 | 3.48±0.75 | 8.12±1.16 | 6.11 |
20~40 | 5.98±0.48 | 0.96±0.11 | 3.82±0.42 | 5.98 | |
柳杉林3) | 0~20 | 3.96±0.44 | 1.63±0.29 | 5.69±0.88 | 3.97 |
20~40 | 3.88±0.28 | 0.14±0.02 | 1.71±0.15 | 3.88 | |
水杉林4) | 0~20 | 5.96±1.01 | 2.81±0.45 | 7.76±1.34 | 5.97 |
20~40 | 5.05±0.54 | 0.72±0.09 | 3.53±0.31 | 5.05 |
项目 Item | 拟合回归方程Linear regression equation | 相关系数Correlation coefficient | ||
---|---|---|---|---|
湿筛Wet sieving | 干筛Dry sieving | 湿筛Wet sieving | 干筛Dry sieving | |
细菌Bacteria | D=2.819 2-0.048 4 X | D=2.431 0-0.033 4 X | -0.807 2* | -0.932 1** |
真菌Fungi | D=2.628 3-0.048 2 X | D=2.301 2-0.034 3 X | -0.717 4* | -0.853 0** |
放线菌Actinomyces | D=2.671 3-0.023 8 X | D=2.326 4-0.016 0 X | -0.722 7* | -0.813 1* |
表7 分形维数与微生物数量的关系
Table 7 Relationship between fractal dimension and soil microbe number
项目 Item | 拟合回归方程Linear regression equation | 相关系数Correlation coefficient | ||
---|---|---|---|---|
湿筛Wet sieving | 干筛Dry sieving | 湿筛Wet sieving | 干筛Dry sieving | |
细菌Bacteria | D=2.819 2-0.048 4 X | D=2.431 0-0.033 4 X | -0.807 2* | -0.932 1** |
真菌Fungi | D=2.628 3-0.048 2 X | D=2.301 2-0.034 3 X | -0.717 4* | -0.853 0** |
放线菌Actinomyces | D=2.671 3-0.023 8 X | D=2.326 4-0.016 0 X | -0.722 7* | -0.813 1* |
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