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6. Conversion and conservation of cloud forests
In the humid tropics the main causes of deforestation and forest conversion are generally the following:
In many tropical mountain areas it is possible to observe the agricultural frontier moving rapidly towards increasingly steeper areas with high rainfall, including large areas of cloud forest. The deforestation of cloud forests in mountainous areas endangers their protective role in hydrological terms and soil conservation. The consequences of erosion provoked by the destruction of cloud forests can be indeed disastrous, as shown by Daugherty (1973).
Cloud forests are frequently destroyed with the aim of establishing grazing land for extensive cattle farming, resulting in soil compaction thus reducing its infiltration capacity and provoking a considerable increase in surface runoff. This change in the hydrological regime, combined with the erosion processes in the upper watersheds, presents a great flood danger for lower watersheds where there are frequently large concentrations of people on river banks.
Although it is not possible to give figures on the loss of cloud forests through the different deforestation and degradation processes, Zadroga (1981) thinks that cloud forests are currently being converted into one of the most rapidly disappearing forest ecosystems under pressure from man.
It is therefore important to support and promote all attempts and activities to protect cloud forests against a change in land use, not only because they are fragile ecosystems (I,a Bastille and Pool, 1978), but also because of their important hydrological properties (Budowski, 1976; Hamilton and King, 1983). Other arguments in favour of the total protection of cloud forests include the danger of erosion, and the protection of endemic species, unique landscapes and genetic resources, mentioned in the previous chapter.
For the Central American and Caribbean region, La Bastille and Pool (1978) described the currently protected cloud forests (generally in the form of national parks) and proposed various additional areas for future protection. They also emphasized the necessity of creating a system or network of cloud forests in the region, with the aim of improving and strengthening their protection and the exchange of scientific information between the different institutions charged with managing and administering the parks.
La Bastille and Pool's (1978) proposal concentrated primarily on cloud forests that, from the biogeographical point of view, exhibit outstanding ecological characteristics, such as special biotopes or endemic species, and are generally restricted to limited areas. Beyond this extremely valid approach, the necessity of ensuring the protection of relatively extensive areas of cloud forest should also be emphasized here, where particular ecological characteristics are of secondary importance to their hydrological role. In the case of Central America, for example, it can be seen that a wide belt in the mountains, particularly on the Atlantic slope, serves this function. According to Holdridge (1982) tropical cloud forests predominate as a wet atmospheric association in the life zones from Moist Forest to Rain Forest of the Premontane and Lower Montane belts. The exposure to prevailing winds must be considered a factor of great importance; in the case of Central America, for example, this implies that the majority of cloud forest zones are situated in the Premontane and Lower Montane belts of the Atlantic slope.
The neotropical region currently has 67 protected areas which include cloud forests (IUCN, 1982). The principal categories of these areas are: National Parks, Biological Reserves, National Reserves, Ecological Reserves, Biosphere Reserves and National Monuments See table 5).
Table 5.Protected areas, including cloud forests in the humid tropics of the Neotropical Realm according to IUCN (1982)
|Bolivia:||Bellavista NP, Isiboro Secure NP, Pilon-Lajas NP, Ulla|
|Ulla BR, German Busch. NR|
|Brasil:||Pico da Neblina NP, Serra da Bocaina NP, Caparo NP,|
|Itatiaia NP, Serra dos Orgaos NP.|
|Colombia:||Natural La Macarena NP, Natural Paramillo NP, Natural|
|Sierra Nevada de Santa Marta NP, El Cocuy NP, Natural|
|Cordillera de los Picachos NP, Natural Nevado del Huila|
|NP, Natural Sumapaz NP, Natural Los Farallones de|
|Cali NP, Natural Purace NP, Natural Tama NP, Natural|
|Munchique NP, Natural Las Orquideas NP, Natural Cueva de los Guacharos NP.|
|Costa Rica:||La Amistad NP, Chirripo NP, Braulio Carrillo NP, Rincon de la Vieja NP, Volcan E'oas NP, de Monteverde BR.|
|Dominican Rep.||Morne Trois Pitous N1'|
|Ecuador:||Sangay NI', Cayambe-Coca ER|
|El Salvador:||Montecristo NP|
|Guatemala:||Rio Dulce NP, Biotopo Universitario pare la Conservaci6n del Quetzal|
|Honduras:||La Tigra NP, Cusuco NP (proposal)|
|Panama:||Darien NP, Volcan Baru NP|
|Peru:||Manu Biosphere Reserve and NP, Tingo Maria NP, Cutervo|
|NP, Machu Pichu National Monument, Huascaran Biosphere|
|Puerto Rico:||Luquillo Experimental Forest Biosphere Reserve|
|Santa Lucia:||Quilesse Forest Reserve|
|Tridad and Tobago:||Northern Range Wi Idlife Sanctuary|
|Venezuela:||Canaima NP, La Neblina NP, Sierra de Perija NP, Sierra|
|Nevada NP, El Tama NP, Henry Pittier NP, Guatopo NP,|
|El Avila NP, Yurubi NP, 1'erepaima NP, El Guacharo NP,|
|Macareo NP, Yacambu NP, Maria Lionza Natural|
|Monument, Chorrera de los Gonzalez Natural Monument,|
|Alejandro Humboldt Natural Monument.|
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