There are several benefits of adopting green roof technologies. Apart from the obvious psychological and aesthetic(美学的)benefits of garden-like environments surrounding you,some of the common economic and ecological benefits are:a reduction in the consumption of energy;air and water purification;recovering green spaces;and the mitigation(缓解)of the heat island effect in urban areas.
The green roof research that is currently ongoing is focused on evaluating the species of plants that are suitable to be grown on roofs,the methods of propagation(繁殖)as well as establishment,nutrient(养料)and water requirement,substrates,and the quantity and quality of water runoff. The evaluation criteria of plant species are:at what rate they can be established:their capacity to withstand invasive weeds:tolerance of cold and heat: tolerance of drought conditions: capacity of persistence and survival.
A number of experiments are being conducted on roof platform simulations at various research centers. These sites are generally outfitted with equipment,which are used to measure temperatures at different depths of the growing substrates, and the rate and volume of the runoff of stormwaters from each of the platforms.
Green roof technology is representative of a completely new market for landscape contractors. And all roofs that currently exist and the future ones to be constructed are the potential market-a market that is too huge to be overlooked.
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