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【Ai赋能】《种群数量变化·“J”型曲线》互动工具及使用说明

【Ai赋能】《种群数量变化·“J”型曲线》互动工具及使用说明

《种群数量变化·J”型曲线》

互动工具使用说明

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一、工具概述

本工具用于展示在理想条件下种群数量按“J”型曲线增长的规律,模型公式为:● 数学模型:N = N·λ

● 核心功能:用户可调节初始数量(N)、周期增长率(λ)和模拟时间(t),实时查看数据表和曲线图变化。

二、参数调节器及输出内容

电脑端

手机端

(一)参数调节器

参数

含义

取值范围

说明

初始种群(N)

起始个体数量

≥1

决定种群增长的起点

周期增长率(λ)

每个时间单位种群数量的倍数

0   ~ 3

λ>1增长;λ=1稳定;0<λ<1下降

模拟时间(t)

1tmax的时间范围

1   ~ 30正整数

共显示tmax个时刻的数据

(二)输出内容

1. 种群数量数据表

1)列名:时间 (t)、种群数量 N(t)

2)示例数据(N = 10λ = 2):0 → 10.0001 → 20.0002 → 40.0003 → 80.0004 → 160.0005 → 320.000

2. 曲线图

1)横轴:时间 (t)

2)纵轴:种群数量N(t)

3)自动根据当前Nλ绘制“J”型曲线

四、操作步骤示例

示例1:观察典型的J型增长(λ=2

1.设置 N = 10λ = 2.0t = 5

2.观察结果:

● 数据表:t=10t=20t=40t=80t=160t=320

● 曲线图:呈现明显的“J”型(指数增长),如下图:

示例2:观察种群灭绝(λ<1

1.保持 N = 10λ = 0.5

2.观察结果:

● 数据表:t=10t=5t=2.5t=1.25、…… 逐渐趋近于0

● 曲线图:种群数量持续衰退、直至灭绝,如下图:

示例3:观察种群稳定(λ=1

1.设置 N = 任意值(如100)、λ = 1.0

2.观察结果:

● 数据表:所有时刻种群数量保持不变

● 曲线图:呈直线,维持在初始数量 (如N = 100)不变。如下图:

示例4:对比不同λ值的影响

1.固定 N = 10t = 5

2.依次调节 λ = 0.51.01.52.03.0

3.分别截图或记录最终数量,对比曲线的陡峭程度

五、教学建议

1.适用学段:本工具适用于高中生物选择性必修2《生物与环境》第1章第2节 种群数量变化相关内容的教学

2.教学目标:

1)理解J型曲线的数学公式 N = N·λ

2)掌握λ的生物学意义(每单位时间增长倍数)

3)认识λ值与种群变化趋势的关系(增长/稳定/下降)

4)对比理想条件(J型)与现实条件(S型)的区别

3.课堂活动建议:

活动

时长

说明

演示讲解

10分钟

教师调节参数,展示三种趋势(灭绝/稳定/暴发)

学生自主探究

15分钟

学生分组调节λ值,记录并描述观察到的变化

小组讨论

10分钟

讨论:为什么自然条件下无法长期维持J型增长?

课后作业

-

给定Nλ,手算预测t=10时的数量,并用工具验证

4.常见学生疑问及引导

1λ能大于3吗?答:工具限定0~3是为了展示完整趋势。实际中λ可更大(如某些细菌每20分钟翻倍,λ=8/天),但曲线过陡不便于观察。

2)为什么λ不能设置为负数?答:生物学中种群数量不能为负,且增长倍数定义为非负数。

3)如果N=0会怎样?答:种群始终为0,该种群不存在。

4)自然界中种群能不能长期一直保持型增长?为什么?

答:不能。因为自然环境的资源、空间是有限的,随着种群数量增加,种内斗争加剧、天敌增多、疾病流行、环境阻力变大,出生率下降、死亡率上升,种群增长就会放缓,最终呈现 S 型增长,无法无限 J 型增长。

六、软件获取

修改代码需要源文件的

可复制下面的链接粘贴到浏览器

https://weidian.com/item.html?itemID=7776049875

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-06-16 21:04:10 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/757531.html
  2. 运行时间 : 0.310978s [ 吞吐率:3.22req/s ] 内存消耗:4,577.31kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=1d959505f632050c232384463124394e
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  1. CONNECT:[ UseTime:0.001074s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001643s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000752s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000715s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001639s ]
  6. SELECT * FROM `set` [ RunTime:0.000638s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001700s ]
  8. SELECT * FROM `article` WHERE `id` = 757531 LIMIT 1 [ RunTime:0.008462s ]
  9. UPDATE `article` SET `lasttime` = 1781615050 WHERE `id` = 757531 [ RunTime:0.019085s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.006098s ]
  11. SELECT * FROM `article` WHERE `id` < 757531 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.045498s ]
  12. SELECT * FROM `article` WHERE `id` > 757531 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003495s ]
  13. SELECT * FROM `article` WHERE `id` < 757531 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.034477s ]
  14. SELECT * FROM `article` WHERE `id` < 757531 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000677s ]
  15. SELECT * FROM `article` WHERE `id` < 757531 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018271s ]
0.312624s