【正文】 的這50%將會(huì)通過(guò)蒸發(fā)被二次利用，從屋頂流失的水分往往小于50%，因?yàn)槲蓓敾▓@往往能夠儲(chǔ)存大量水分甚至更多）。這些新規(guī)定實(shí)際上是一種對(duì)屋頂花園的間接補(bǔ)貼，不會(huì)花費(fèi)政府一分錢，甚至還會(huì)節(jié)省公共費(fèi)用，因?yàn)檫@是一項(xiàng)人民的福利措施?？紤]到日益增加的淡水費(fèi)用，一些年后房產(chǎn)所有人就能夠還清貸款。在德國(guó)的一些城市以及省份，地方政府已經(jīng)認(rèn)識(shí)到了屋頂花園的優(yōu)勢(shì)并且開始予以補(bǔ)貼—每平方米15歐元。在德國(guó)，面積大于500平方米的屋頂綠化成本完全可以低于15歐元，其形式往往是特定區(qū)域常綠的開敞型屋頂花園。 標(biāo)準(zhǔn)和技術(shù)指南在德國(guó)，從所周知的是DIN，即德國(guó)國(guó)家工業(yè)標(biāo)準(zhǔn)，而在園林綠化方面，更加有權(quán)威的是FLL，即園林綠化研究、發(fā)展與建設(shè)團(tuán)體制訂并頒布的同名規(guī)范。園林綠化研究、發(fā)展與建設(shè)組織（FLL）于1975年成立，研究、創(chuàng)立、普及并推廣一切與園林綠化發(fā)展相關(guān)的原則、指南與規(guī)范，從而確保環(huán)境質(zhì)量。這些法律出版物涵蓋了園林綠化材料、植物與種植技術(shù)、園林工程的施工與養(yǎng)護(hù)等等一切相關(guān)內(nèi)容。綠色屋頂?shù)脑O(shè)計(jì)、安裝以及后期養(yǎng)護(hù)技術(shù)指南（“FLLRichtlinien”,Fuidelines for the Planning, lnstallation and Maintenance ot Greed Roofs）主要針對(duì)的是屋頂綠化工程相關(guān)技術(shù)指導(dǎo)，涉及內(nèi)容包括：屋頂綠化的設(shè)計(jì)，屋頂綠化工程的施工和屋頂綠化產(chǎn)品安裝的技術(shù)，以及屋頂綠化完成之后養(yǎng)護(hù)工作的規(guī)定和技術(shù)指南。這項(xiàng)指南是當(dāng)今屋頂綠化領(lǐng)域內(nèi)最全面也是最權(quán)威的一項(xiàng)指南，德國(guó)乃至整個(gè)歐洲的園林綠化行業(yè)都需遵循這項(xiàng)規(guī)定。Roof Garden in Germany（Germany）Werner Peter KuestersAbstractThis paper introduces the types of roof garden in Germany, structure, working principle, the government39。s policy support. Roof garden is a necessity, not luxury.Key words: landscape architecture。 Roof garden。 Review。 Open type1 the advantage of roof gardenRoof garden has many advantages。 it is a needless to say it is undeniable fact. Some people still have doubts or take the opposite point of view。 the main reason is that these people don39。t understand the technology development of roof garden. In the 30 years ago or just 15 years ago, these questions more associated with technology. Now questions mainly related to the cost. Now we can have roof garden has pletely is not a problem, because of the roof garden is a necessity, rather than a luxury.(1) Maintain moistureAccording to the roof garden design, direct moisture loss will be reduced 70% ~ 90 (100) %. Drain can greatly reduce the number of the diameter of the pipe can be smaller, so we can save a lot of buildings. The collected water also can be transmitted through daily evaporation and natural circulation.⑵ The use of spaceOrdinary unused roof area for roof garden design, especially as a public entertainment and sports building roof, not only make full use of valuable space, but also reduce the cost of buying land.(3) Nature of animal and plant habitatRoof garden is rarely bother, a beautiful environment, beneficial insects can find a pure land to survive。 the birds can also find a habitat. Is full of roof garden city is established suitable for small animals to survive in cities the nature.(4) Reduce the concentration of dust and smokeRoof garden to help filter the dust and smoke particles from the air and rain in the absorption of harmful substances, and its removal from the soil.⑸ could prolong the service life of roofRoof garden protection waterproof layer is not affected by climate, ova and other damage, which greatly extend the service life of the building. Bare roof at high temperature can reach above 100 ℃ in summer, while night fell to below 20 ℃, which means that the waterproof layer material, joint and other material was in a state of extreme fatigue.Because the system of evaporation, shade, and the cooling effect of atmospheric circulation, a roof garden the highest temperature is 25 ℃ (Germany), and cool down slowly.⑹ Reduce noiseRoof garden at least 3 db noise can be reduced, and noise isolation efficiency reaches 8 decibels. That for some there is noisy disco near the airport or for buildings and other large equipment is the most effective.⑺ As additional thermal insulation layerSystem is able to bring a piece of a cool roof, air flow and evaporation can greatly cooling roof and protect against high temperature damage. To the top floor of the building can save at least 50% for air conditioning energy, can save 50% of the winter heating energy.⑻ To improve the climate environmentRoof garden to cooling ambient atmosphere and increase of humidity, thus creating a microclimate, atmosphere generated to improve the urban atmospheric conditions, reduce air pollution.(9) Avoid heat island effectTranspiration moisture absorbing heat and cooling the atmosphere。 green vegetation, purify the atmosphere and reduce the potential threat of smoke, so the ro