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JOURNAL ARTICLE
Deforestation and Its Effects in Highland Madagascar
Daniel W. Gade
Mountain Research and Development
Vol. 16, No. 2 (May, 1996), pp. 101-116
Published by: International Mountain Society
DOI: 10.2307/3674005
https://www.jstor.org/stable/3674005
Page Count: 16
P1: 某地的highland从前是森林。这个highland发现了28种植物都是只有在forest的条件下才能产生的(有题)。
Several lines of evidence support the idea that the Highlands were once forested. All living mammalian species on Madagascar are forest dwelling, including the 28 kinds of lemurs, all of which are arboreal (Figure 2). Moreover, subfossils belonging to now extinct animals of the forest have been recovered from treeless highland sites along with trunks and more than two dozen tree fruits (Perrier de la Bathie, 1914; 1927a). Pollen spectra, dated roughly about AD. 1000, from a site near Lake Itasy can be interpreted as being from forest vegetation (MacPhee et al., 1985: 470).
P2:很多调查人员(高亮考题)认为highland森林的消失与其自然气候有关:在雨季之后会有七个月的旱季。然后作者认为,这种论断忽略了以下两点:一,露珠可以让土壤保持适度;二,fog will lead water balance
Some researchers have continued to interpret the vegetation of Madagascar’s highlands differently. Bourgeat (1972: 107) believed that grassland reflects a changing climate since the late Quaternary. Dewar (1984: 588) has argued for a highland mosaic of forest and grassland as a response to seasonal lack of rainfall. For his part, Raison (1984: II: 266) asserts that the forest-grassland mosaic in the Middle West subregion is in response to a long dry season and fohn-like easterly winds. However, seasonal desiccation as an explanation ignores two microclimatic characteristics of the Madagascan highland forest. Lichens and mosses on the forest floor hold large quantities of water to protect the soil from drying out and, in addition, fog drip and dew condensation contribute to the water balance enabling a closed forest to maintain itself in a wet-dry climatic regime.
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