放牧强度和地形对内蒙古典型草原物种多度分布的影响
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李文怀, 郑淑霞, 白永飞
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Effects of grazing intensity and topography on species abundance distribution in a typical steppe of Inner Mongolia
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LI Wen-Huai, ZHENG Shu-Xia, BAI Yong-Fei
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表2 平地和坡地系统中不同载畜率下常见种多度分布的模型拟合结果
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Table 2 Test of model ?tting for abundance distribution of common species at different stocking rates on flat and slopes
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| 地形Topography | 载畜率
Stocking rate (sheep·hm-2) | 对数正态模型
Log-normal model | | 对数级数模型
Log-series model | | 幂分割模型
Power fraction model | | 拟合值 Fitted value r | | 拟合值 Fitted value r | | 拟合值 Fitted value r | | 平地 Flat | 0 | 6.74 | | 499 524.71 | | 1.41 | | 1.5 | 14.75 | | 971.90 | | 11.56 | | 3.0 | 5.38 | | 424.30 | | 3.34 | | 4.5 | 4.71 | | 464.07 | | 2.58 | | 6.0 | 7.19 | | 1 143.67 | | 3.65 | | 7.5 | 8.58 | | 382.30 | | 5.77 | | 9.0 | 5.44 | | 209.68 | | 6.29 | | 坡地 Slope | 0 | 1.66 | | 209 543.72 | | 2.13 | | 1.5 | 8.08 | | 565.44 | | 8.67 | | 3.0 | 5.79 | | 399.67 | | 5.71 | | 4.5 | 6.61 | | 510.48 | | 4.74 | | 6.0 | 9.65 | | 1 033.60 | | 10.04 | | 7.5 | 8.96 | | 1 694.28 | | 8.09 | | 9.0 | 7.78 | | 1 483.75 | | 6.09 |
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