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为使黄土不露天,美化环境,各地布置了大片的绿色草坪。但是,草坪的喷灌要消耗大量的水。特别在干旱地区,草坪用水量要占到居民用水的1/3—1/2。于是有人提出“耐旱风景”的观念,即选用当地既耐旱又美观的植物,来代替耗水量大的草坪。这样,可以节省水量30%—80%,并可相应地减少化肥和农药的耗费和污染,一举多得。美国不少州积极支持这种节水和改善环境的措施。图森市1991年还具体地规定:风景区种草面积不得超过10%。
To make the loess is not open-air, landscaping, around the layout of a large green lawn. However, lawn sprinkling consumes a lot of water. Especially in arid areas, lawn water consumption accounts for 1 / 3-1 / 2 of the water for residents. So some people put forward the concept of “drought-tolerant landscape”, that is, instead of water-intensive lawns, plants that are both drought-resistant and beautiful in the local area are selected. In this way, you can save 30% -80% of the water, and can correspondingly reduce the consumption and pollution of fertilizers and pesticides, in one fell swoop. Many U.S. states have actively supported such measures to save water and improve the environment. Tucson 1991 also specifically states: scenic area of grass should not exceed 10%.