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真题反思:萎缩流域的物种间竞争加强

真题反思:萎缩流域的物种间竞争加强
又是和同一题杠上了:

分水岭的迁移对自然地理环境有重要影响。某研学小组在考虑了降水、构造运动和岩性软硬差异三个影响分水岭迁移的关键因素后,绘出如下图所示四种分水岭迁移模式。据此完成下面小题。

9. 上图中,正确反映以侵蚀作用为主导的分水岭迁移模式是(  )

A. 甲        B. 乙

C. 丙        D. 丁

10. 丁模式所示分水岭的迁移可导致(  )

①分水岭两侧水热空间分布调整

②扩张流域地表侵蚀强度减弱

③分水岭两侧垂直带谱趋于简单  

④萎缩流域的物种间竞争加强

A. ①② B. ②③

C. ③④ D. ①④

我不太理解“④萎缩流域的物种间竞争加强”。从空间上来看,虽然萎缩流域的水平范围有所收缩,但垂直范围得以扩展,那么垂直自然带会增多,复杂的垂直带谱有更多容纳不同物种生存的空间。因此我不理解此情境下,如何对“物种间竞争的强弱”进行判断。
本题素材取自贺传奇等学者的“Drainage divide migration and implications for climate and biodiversity”。文中有提及“扩张流域”和“萎缩流域”,但是主要讨论的是河流袭夺对不同流域物种多样性的影响。论文并没直接讨论“分水岭迁移对物种间竞争的影响”
▼河流袭夺对鱼类多样性的影响示意
(来源:贺传奇等)
高中地理教材除了“不同植被群体对阳光的生存竞争”外,其他地方没有明显提及“种间竞争”了。于是查阅高中生物学相关资料。
发现高中生物学课标在选必2“生物与环境”中有“举例说明阳光、温度和水等非生物因素以及不同物种之间的相互作用都会影响生物的种群特征”的内容要求。对应的人教版的生物学教材中也在多个章节中包含了“种间竞争”的内容。
▼人教版生物学选必2对“种间关系”的介绍
最下方有阐明“种间竞争”的定义
依据高中教材中给出的定义,种间竞争指不同的生物共同利用相同的有限资源和空间而产生的相互排斥的现象。既然地理是“从空间的视角看待一切”,那么假设题中的物种间竞争的是空间(其实模式图是理想化图式,从中也无法判断食物等资源的变化情况),可推出:
由于丁模式中的萎缩流域一侧的山体高差由小变大山体坡度由缓变陡。所以萎缩流域的垂直带谱趋于复杂,同时每个垂直带的范围被压缩。由此可得,在丁模式表示的变化过程中,会共同利用相同空间的物种间的竞争关系将更激烈
我最初不能理解“萎缩流域的物种间竞争加强”,问题在于我将动态的过程简化为静态的切片。垂直带的分化,可能是“种间竞争加强”后促成的,而非由于山体高度抬升后,复杂的垂直带谱就突然存在,物种间的竞争关系就直接被缓解。
这其实涉及竞争排除原则(又称高斯法则两个物种完全依赖同一种有限资源(或空间),则两物种必然无法长期稳定共存,竞争弱势方终将被排除。物种间可通过生态位分化性状替换环境变异等机制拉开资源利用差异,避免竞争排除。
▼①较小的黄鸟在树上觅食;
②较大的红鸟竞争资源;
③红鸟在竞争中获得优势,资源更丰富
黄鸟适应了新的生态位,避免竞争排除
(来源:维基百科-竞争排除原则
因此,理解“萎缩流域的物种间竞争加强”的逻辑可能是:
分水岭向右侧迁移,且高度抬升;
②萎缩流域的高度范围扩大,坡度变陡;
③每个垂直自然带的海拔范围被压缩;
④利用同一空间和水热资源的物种间竞争加强;
⑤竞争弱势方会被排除,或产生生态位分化(如海拔上的分化,进而促使不同垂直景观带形成)。
小吐槽:又是一题跨学科更好理解的题!在阅读高中生物学教材时,发现“影响种间竞争的因素”其实挺复杂的,而此部分内容安排在选择性必修模块。如果我的理解靠谱的话,这部分内容对于只选地理而未选生物学的考生是否会太陌生……

参考文献:

[1] He C , Braun J , Tang H ,et al.Drainage divide migration and implications for climate and biodiversity[J].Nature Reviews Earth & Environment, 2024, 5(3):177-192.

[2] 维基百科. 竞争排除原则 [EB/OL]. (2026-07-02) [2026-08-03].  

https://zh.wikipedia.org/wiki/%E7%AB%9E%E4%BA%89%E6%8E%92%E9%99%A4%E5%8E%9F%E5%88%99.

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  1. CONNECT:[ UseTime:0.000494s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000782s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000394s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000307s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000591s ]
  6. SELECT * FROM `set` [ RunTime:0.000284s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000668s ]
  8. SELECT * FROM `article` WHERE `id` = 900651 LIMIT 1 [ RunTime:0.000467s ]
  9. UPDATE `article` SET `lasttime` = 1786093074 WHERE `id` = 900651 [ RunTime:0.002994s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000251s ]
  11. SELECT * FROM `article` WHERE `id` < 900651 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000548s ]
  12. SELECT * FROM `article` WHERE `id` > 900651 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000444s ]
  13. SELECT * FROM `article` WHERE `id` < 900651 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001804s ]
  14. SELECT * FROM `article` WHERE `id` < 900651 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003816s ]
  15. SELECT * FROM `article` WHERE `id` < 900651 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000934s ]
0.119673s