| 扩散对斑块上食饵-捕食种群生存的影响 |
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| 引用本文： | 吴月宁,张 辉,赵惠燕. 扩散对斑块上食饵-捕食种群生存的影响[J]. 西北农林科技大学学报(自然科学版), 2005, 33(10): 21-23 |
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| 作者姓名： | 吴月宁 张 辉 赵惠燕 |
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| 作者单位： | [1]西北农林科技大学生命科学学院,陕西杨凌712100 [2]西北农林科技大学植物保护学院,陕西杨凌712100 [3]咸阳师范学院数学系,陕西咸阳712000 |
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| 摘 要： | 建立了2个斑块上种群扩散的食饵-捕食系统,主要研究了当其中一个斑块受到输入量存在极限值的外来毒素污染时,扩散对2个斑块上3个种群生存的影响。结果表明,当扩散存在且扩散率满足一定条件时,食饵种群和捕食者种群在未来时刻将全部灭绝;而当扩散率满足另一条件时,食饵种群和捕食者种群将持续生存,进而会影响斑块上的生物多样性。
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| 关 键 词： | 食饵 捕食者 斑块 毒素污染 种群扩散 种群数量 |
| 文章编号： | 1671-9387（2005）10-0021-03 |
| 收稿时间： | 2005-03-01 |
| 修稿时间： | 2005-03-01 |
The effect of diffusion on predator-prey system in patches |
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| WU Yue-ning, ZHANG Hui, ZHAO Hui-yan, LIU Guang-zu,(.College of Life Sciences ;. College of Plant Protettion. North west A. The effect of diffusion on predator-prey system in patches[J]. Journal of Northwest A&F University（Natural Science Edition）, 2005, 33(10): 21-23 |
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| Authors: | WU Yue-ning, ZHANG Hui, ZHAO Hui-yan, LIU Guang-zu,(.College of Life Sciences . College of Plant Protettion. North west A |
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| Affiliation: | WU Yue-ning, ZHANG Hui, ZHAO Hui-yan, LIU Guang-zu,(1.College of Life Sciences ;2. College of Plant Protettion. North west A |
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| Abstract: | This paper sets up a predator-prey system with diffusion on two patches;the main study is how diffusion affects the three populations' existence when one of the two patches is polluted.If the amount of toxin on the polluted patch has a limitation and the population on the polluted patch may move between the two patches and the population on the unpolluted patch can not move to another patch,there will be the following solutions:if the rate of diffusion meets some condition,the two populations will die out;if the rate of diffusion meets the other one,the two populations can survive continuously,so the biodiversity will be affected. |
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| Keywords: | prey predator patch toxin pollution diffusion the number of population |
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