evergreen? perennial?
Explanation:
To meet the ecologicAL functions, especially in the cities, plants with dense FOLIAGE [THICK CANOPY][delete : and big structure of leaves] such as EVERGREEN/PERENNIAL [delete:yearly] trees must be PREFERRED [prioritized].
The context you have provided is rather skimpy. The above is as per my educated guess.
By annual you probably mean one or both of the following:
1. The plant is long living so that it can provide ecological functions in city areas for a long time.
2. The plant does not become bare at some part of the year, that is it is evergreen, like the neem tree, which is always in foliage throughout the year. Many trees shed their leaves in the dry season to conserve water and are bare in peak summer. Such trees are unsuited for urban areas as that is the time when shade is most needed.
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Note added at 34 mins (2005-06-30 02:22:36 GMT)
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There is no such term as yearly trees. There can\'t be for trees are large plants that live for years.
The terms used to indicate the life-span of plants is annual, biannual, perennial, etc.
Annuals are those that live only for one year.
Biannuals are those that complete their life-cycle in two years.
Perennials are those plant that live for several years. ALL trees are by definition perennials.
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Note added at 38 mins (2005-06-30 02:26:33 GMT)
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The phrase that you probably have in mind is \"year after year\", meaning perpetually. This meaning is not conveyed by \"yearly\".
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Note added at 42 mins (2005-06-30 02:29:54 GMT)
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In that case, the term you are looking for is \"quick-growing trees\", that is, trees that acquire a fairly full canopy in a year or two like amaltas, palash (flame of the forest), babul (Prosopis juliflora) and even eucalyptus, though in the case of the last, there is hardly any canopy even in large specimens of the tree.
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Note added at 46 mins (2005-06-30 02:34:35 GMT)
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If by \"utilizing\" you mean chopped down to extract timber, then you could be meaning \"slow-maturing trees\" like teak, which incidently also has very large leaves. Teak cutting cycles are generally 50 or 60 years, which can be considered to be long enough. Till that time, they can continue to provide ecological functions in city areas, and no one would think of cutting them down, as they have not yet attained timber value.
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Note added at 1 hr 47 mins (2005-06-30 03:35:14 GMT)
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To Robert:
When you think of city trees, you probably have avenue trees in mind which is perhaps at the root of the confusion. Cities take up tree plantation work not only for beautification purposes. Trees are planted along riverbanks to prevent erosion and to check floods. Trees are planted along railway tracks and roads to protect the tracks or the roads. Trees are also planted for fuelwood in energy plantations. In desert-areas trees are planted to stabilize sand dunes when may otherwise move into human settlements. etc. Trees are also planted for the specific purpose of providing fuelwood and fodder. These tree plantations are definitely cut periodically.
One of the major issues in developing countries when tree plantation is taken up, is to protect the trees from fuelwood and fodder gatherers. The official solution to this, and which is much derided by environmentalists, is to choose those trees that have no use as fuelwood or fodder (eucalyptus for example) on the presumption that these trees at least perform ecological functions.
My (latest !) guess is that what is meant here is broad-leaved trees (most local species of trees in the context of Indonesia would be broad-leaved trees) that provide a yearly crop of minor produce like fodder and fuel are to be preferred to exotics that do not provide this yearly bonazza of resources.
You are right that there is no context to go by here and we are all playing the guessing game.
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Note added at 1 hr 53 mins (2005-06-30 03:41:08 GMT)
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Some trees have good coppicing power, that is, they can regrow quickly when some of their branches are cut for fuel/fodder.
\"Yearly\" could also refer to this, that is, trees that can be coppiced annually for fuel/fodder.
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peer agreement (net): +1
