Scientia Silvae Sinicae ›› 2022, Vol. 58 ›› Issue (8): 53-62.doi: 10.11707/j.1001-7488.20220806
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Huifang Yao1,2,3,Jie Lu1,2,3,*,Jiaqin Zeng4,Daqing Luo1,2,3,Xinsheng Zhang1,2,3,Chao Wang1,2,3,Deshui Yu1,2,3
Received:
2021-04-06
Online:
2022-08-25
Published:
2022-12-19
Contact:
Jie Lu
CLC Number:
Huifang Yao,Jie Lu,Jiaqin Zeng,Daqing Luo,Xinsheng Zhang,Chao Wang,Deshui Yu. Altitudinal Differences in Intraspecific and Interspecific Competition Index of Natural Forests of Quercus aquifolioides in Southeast Tibet[J]. Scientia Silvae Sinicae, 2022, 58(8): 53-62.
Table 1
Survey of sample plots"
样地号 Sample plot No. | 海拔 Altitude/ m | 经纬度 Longitude and latitude | 郁闭度 Canopy density | 坡度 Gradient (%) | 坡向 Aspect | 林分密度 Stand density/hm-2 | 平均胸径 Mean DBH/cm | 平均树高 Mean tree height/m |
a | 3 740 | 29°44′15.31″N,94°43′1.31″E | 0.80 | 28 | 西坡West(279°) | 2 440 | 20.082 | 12.313 |
b | 3 640 | 29°44′14.59″N,94°43′24.28″E | 0.82 | 24 | 西坡West(264°) | 3 120 | 20.603 | 12.362 |
c | 3 540 | 29°44′13.20″N,94°43′2.02″E | 0.85 | 22 | 西坡West(270°) | 4 840 | 18.508 | 11.529 |
d | 3 440 | 29°44′16.37″N,94°43′24.51″E | 0.90 | 19 | 西坡West(260°) | 8 120 | 19.569 | 12.889 |
Table 2
Proportion of tree species composition in each plots %"
树种Tree species | 样地号Sample plot No. | |||
a | b | c | d | |
川滇高山栎Quercus aquifolioides | 34.5 | 61.2 | 87.5 | 87.0 |
林芝云杉Picea likiangensis var. linzhiensis | 8.4 | 6.6 | 2.3 | 5.7 |
急尖长苞冷杉Abies georgei var. smithii | 49.0 | 16.0 | 3.1 | 2.8 |
糙皮桦Betula utilis | 4.9 | 5.7 | 2.8 | 1.7 |
白桦Betula platyphylla | 3.2 | 10.5 | 4.3 | 2.8 |
Table 3
Status of objective trees and competitive trees"
样地号 Sample plot No. | 对象木Object trees | 竞争木Competitive trees | |||||||||
株数 Plant number | 最大胸径 Maximum DBH/cm | 最小胸径 Minimum DBH/cm | 最高树高 Maximum tree height/m | 最低树高 Minimum tree height/m | 株数 Plant number | 最大胸径 Maximum DBH/cm | 最小胸径 Minimum DBH/cm | 最高树高 Maximum tree height/m | 最低树高Minimum tree height/m | ||
a | 29 | 38.22 | 5.73 | 20.00 | 2.70 | 93 | 94.90 | 5.10 | 38.00 | 3.00 | |
b | 34 | 28.66 | 6.05 | 19.00 | 4.00 | 122 | 101.89 | 5.10 | 46.00 | 3.00 | |
c | 72 | 35.03 | 5.41 | 24.00 | 2.00 | 170 | 73.25 | 5.41 | 38.00 | 1.00 | |
d | 101 | 42.04 | 5.41 | 23.00 | 1.00 | 305 | 41.40 | 5.10 | 21.00 | 2.00 |
Table 4
DBH distribution and competition index of object trees in Quercus aquifolioides natural forest"
样地号 Sample plot No. | 径级 DBH class/ cm | 株数 Plant number | 株数比例 Plant number percentage(%) | 最小竞争 指数 Minimum competition- index | 最大竞争 指数 Maximum competition- index | 平均竞争指数 Mean competition index | 种内 竞争指数 Intraspecific competition index | 种间 竞争指数 Interspecific competition index | 总竞争指数 Overall competition index |
a | Ⅰ | 4 | 13.793 | 0.481 | 51.011 | 13.127 | 1.495 | 51.011 | 52.506 |
Ⅱ | 7 | 24.138 | 0.153 | 2.190 | 2.211 | 5.178 | 10.295 | 15.474 | |
Ⅲ | 9 | 31.034 | 0.078 | 2.273 | 1.864 | 4.092 | 12.681 | 16.775 | |
Ⅳ | 5 | 17.241 | 0.068 | 0.810 | 1.293 | 3.838 | 2.628 | 6.466 | |
Ⅴ | 4 | 13.793 | 0.065 | 0.787 | 0.925 | 1.633 | 2.067 | 3.699 | |
合计Total | 29 | 100.000 | — | — | — | 16.236 | 78.682 | 94.918 | |
b | Ⅰ | 9 | 26.471 | 0.223 | 4.384 | 6.733 | 18.652 | 41.948 | 60.600 |
Ⅱ | 12 | 35.294 | 0.023 | 5.116 | 2.700 | 2.964 | 29.431 | 32.395 | |
Ⅲ | 6 | 17.647 | 0.095 | 1.365 | 0.734 | 1.914 | 2.491 | 4.405 | |
Ⅳ | 3 | 8.824 | 0.065 | 2.818 | 2.031 | 0.000 | 6.094 | 6.094 | |
Ⅴ | 4 | 11.765 | 0.056 | 0.803 | 0.556 | 0.000 | 2.223 | 2.223 | |
合计Total | 34 | 100.000 | — | — | — | 23.530 | 82.187 | 105.717 | |
c | Ⅰ | 26 | 36.111 | 0.079 | 7.885 | 3.571 | 29.980 | 62.873 | 92.853 |
Ⅱ | 18 | 25.000 | 0.097 | 3.374 | 1.698 | 7.646 | 22.910 | 30.556 | |
Ⅲ | 12 | 16.667 | 0.075 | 2.050 | 0.935 | 4.067 | 7.153 | 11.220 | |
Ⅳ | 8 | 11.111 | 0.076 | 2.176 | 0.894 | 2.348 | 4.801 | 7.149 | |
Ⅴ | 3 | 4.167 | 0.155 | 1.767 | 1.591 | 1.170 | 3.602 | 4.772 | |
Ⅵ | 5 | 6.945 | 0.057 | 0.466 | 0.492 | 0.676 | 1.784 | 2.460 | |
合计Total | 72 | 100.000 | — | — | — | 45.887 | 103.123 | 149.010 | |
d | Ⅰ | 29 | 28.713 | 0.128 | 7.810 | 2.047 | 33.516 | 25.857 | 59.373 |
Ⅱ | 21 | 20.792 | 0.140 | 2.254 | 2.227 | 34.929 | 11.848 | 46.776 | |
Ⅲ | 28 | 27.723 | 0.129 | 1.738 | 1.333 | 27.877 | 9.443 | 37.321 | |
Ⅳ | 16 | 15.842 | 0.127 | 1.109 | 1.133 | 15.513 | 2.611 | 18.124 | |
Ⅴ | 7 | 6.931 | 0.089 | 1.538 | 1.233 | 7.538 | 1.096 | 8.634 | |
合计Total | 101 | 100.000 | — | — | — | 119.373 | 50.855 | 170.228 |
Table 5
Species composition and competition index of associated tree species in different sample plots"
样地号 Sample plot No. | 树种 Tree species | 株数 Plant number | 比例 Percentage (%) | 平均胸径 Mean DBH/cm | 平均树高 Mean tree height/m | 竞争指数 Competition index | 平均竞争指数Mean competition index | 排序Ranking |
a | 急尖长苞冷杉A. georgei var. smithii | 44 | 72.13 | 28.966 | 16.184 | 64.334 | 1.462 | 1 |
林芝云杉P. likiangensis var. linzhiensis | 10 | 16.39 | 27.452 | 18.880 | 10.160 | 1.016 | 2 | |
糙皮桦B. utilis | 4 | 6.56 | 17.357 | 14.500 | 2.941 | 0.735 | 3 | |
白桦B. platyphylla | 3 | 4.92 | 18.260 | 10.933 | 1.247 | 0.416 | 4 | |
合计Total | 61 | 100.00 | — | — | 78.682 | — | — | |
b | 急尖长苞冷杉A. georgei var. smithii | 70 | 70.00 | 19.654 | 11.601 | 49.539 | 0.708 | 1 |
白桦B. platyphylla | 15 | 15.00 | 25.796 | 11.153 | 15.041 | 1.003 | 2 | |
林芝云杉P. likiangensis var. linzhiensis | 9 | 9.00 | 53.609 | 25.544 | 14.643 | 1.627 | 3 | |
糙皮桦B. utilis | 6 | 6.00 | 21.762 | 16.500 | 2.964 | 0.494 | 4 | |
合计Total | 100 | 100.00 | — | — | 82.187 | — | — | |
c | 急尖长苞冷杉A. georgei var. smithii | 38 | 38.00 | 22.536 | 13.208 | 38.761 | 1.020 | 1 |
白桦B. platyphylla | 29 | 29.00 | 23.150 | 12.521 | 32.113 | 1.107 | 2 | |
糙皮桦B. utilis | 16 | 16.00 | 30.195 | 13.219 | 16.893 | 1.056 | 3 | |
林芝云杉P. likiangensis var.linzhiensis | 17 | 17.00 | 33.702 | 18.088 | 15.356 | 0.903 | 4 | |
合计Total | 100 | 100.00 | — | — | 103.123 | — | — | |
d | 白桦B. platyphylla | 26 | 45.61 | 23.531 | 11.230 | 29.690 | 1.142 | 1 |
糙皮桦B. utilis | 19 | 33.33 | 23.299 | 12.184 | 12.042 | 0.634 | 2 | |
急尖长苞冷杉A. georgei var. smithii | 9 | 15.79 | 15.110 | 10.333 | 8.043 | 0.894 | 3 | |
林芝云杉P. likiangensis var. linzhiensis | 3 | 5.26 | 14.968 | 8.833 | 1.080 | 0.360 | 4 | |
合计Total | 57 | 100.00 | — | — | 50.855 | — | — |
Table 6
Fit analysis of DBH and competition index of object trees"
样地号 Sample plot No. | 最优函数 Optimal function | 拟合方程 Fitting equation | R2 | 显著性 Significance |
a | 幂函数Power function | CI = 45.384DBH-1.243 | 0.313 8 | P<0.01 |
b | 三次多项式函数Cubic polynomial function | CI = -0.002 1DBH3+0.131 5DBH2-2.769 7DBH+20.56 | 0.527 1 | P<0.01 |
c | 三次多项式函数Cubic polynomial function | CI = -0.000 7DBH3+0.049DBH2-1.144 5DBH +9.681 6 | 0.301 4 | P<0.01 |
d | 指数函数Exponential function | CI = 2.454 9e-0.048DBH | 0.134 6 | P<0.01 |
Table 7
Model prediction results of individual competition index of of object trees in Q. aquifolioides natural forest"
样地号 Sample plot No. | DBH/cm | ||||||||
5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | |
a | 6.139 | 2.594 | 1.567 | 1.096 | 0.830 | 0.662 | 0.547 | 0.463 | 0.400 |
b | 11.933 | 2.811 | 1.210 | 0.665 | 0.418 | 0.286 | 0.208 | 0.157 | 0.123 |
c | 3.644 | 1.503 | 0.895 | 0.620 | 0.466 | 0.369 | 0.303 | 0.256 | 0.220 |
d | 2.384 | 1.482 | 1.121 | 0.921 | 0.790 | 0.697 | 0.627 | 0.572 | 0.528 |
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