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文章类型:科学解释+观点对比
文章大意:提出了某一个现象——高地曾经是草木生的,解释其发生的原因,有另一部分人从其他角度解释这个现象的原因(和第一种解释行程对比),作者最后表达对第二种解释的观点:有缺陷(忽略了某些原因)
文章结构:
P1:keyword——evidence、forested
首句说明文章背景:高地曾经是草木生的。然后从三个角度解释了原因:
-all living mammalian species on M are forest dwelling
-moreover, subfossils belonging to mow extinct animals of forest have been recovered from treeless highland site.
- pollen spectra from a site near lake I can be inteepreted as being from forest vegetation
P2: keyword——differently、vegetation
其他研究员以不同的方式解释了M的植物生。
B :grassland reflects a changing climate since late Q
D: highland mosaic and grasslan——>lake fo rainfall.
R: the forest-grassland mosaic ——> a long fry season and fohn-like easterly winds.
作者观点(转:however):seasonal desiccation as an explanation ignores two microclimatic characteristics
- lichens & mosses: hold large quantities of water to protect the soil
- fog drip&dew condensation contribute to the water balance enabling a closed forest to maintain itself in a wet-dry climatic regime |
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