| 羊草草地放牧退化演替中种群消长模型的研究 |
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| 引用本文： | 王仁忠,李建东.羊草草地放牧退化演替中种群消长模型的研究[J].植物生态学报,1995,19(2):170-174. |
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| 作者姓名： | 王仁忠 李建东 |
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| 作者单位： | 东北师范大学草地研究所 |
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| 摘 要： | 羊草草地是东北西部及内蒙东部草原区主要的天然放牧场和割草场、具有较高的经济价值，但是由于长期过度放牧，草地已严重退化并盐碱化。本文采用数学手段，以植物种群在群落中的相对优势度为指标，用植被在放牧退化演替系列上的空间分布序列推断其在时间上演替系列的方法，研究羊草等5种植物种群的优势度随放牧退化演替消长的规律及其数学模型。羊草按D＝124.2e-0.35T衰退，寸草苔和糙隐子草分别按D＝2.13T3.3e-0.15T2和 D=1.77T3.7e-0.29T2消长，而角碱蓬和虎尾草分别按D=0.11e1.3T和D=0.38e0.94T增加。
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| 关 键 词： | 放牧演替 种群 消长模型 |
DYNAMIC POPULATION MODELS OF THE ECOLOGICAL DOMINANCE DURING THE RETROGRESSIVE SUCCESSION OF LEYMUS CHINENSIS GRASSLAND |
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| Wang Ren-zhong,Li Jian-dong.DYNAMIC POPULATION MODELS OF THE ECOLOGICAL DOMINANCE DURING THE RETROGRESSIVE SUCCESSION OF LEYMUS CHINENSIS GRASSLAND[J].Acta Phytoecologica Sinica,1995,19(2):170-174. |
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| Authors: | Wang Ren-zhong Li Jian-dong |
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| Abstract: | Grasslands dominated by Leymus chinensis in the west part of the northeast China and the eastern Inner Mongolia are the main natural pasture for grazing and hay production, and, therefore they are highly economically valuable. However, the degradation of these grassland ecosystem are very severe, mainly due to overgrazing.In this paper, we will use mathematical’models to show the change of the relative dominance of plant populations in the retrogressive succession series. In lightly and moderately grazed grasslands, Leymus chinensis is the dominance. Its relative dominance changes with increasing grazing intensity, and this change can be described by an equation, D=124.2e-0.35T2. In the entire succession series, the changes of the relative dominance of Carex duricscula and Cleistogenes squarrosa can be explained using models of D=2.13T3.3 e-0.15T2 (for C. duricscula) and D=1.77T3.7e-0.29T2 (for C. squarrosa). The relative dominance of Suaeda corniculata and Chloris virgata increases as the grassland degrades. Their relative dominance changes can be elucidated by the following models, D =0.11e1.3T (for S. corniculata) and D=0.38e10.94T (for C. virgata), respectively. Our results indicate that the shift of dominant species is very conspicuous during the retrogressive succession of grassland communities. |
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| Keywords: | Plant population Mathematical model Leymus chinensis Grassland Inner Mongolia |
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