Water is usually considered to be the key limiting factor for growth of desert plants, yet there is little information available of the water use efficiency of species within a desert community.
水分通常是影响荒漠植物生长的主要限制因子，然而当前很少有关于荒漠群落中植物水分利用效率的报道。
If people want plants to play a role in different environments, the key is option of species.
要使植物在不同的环境中发挥作用，关键在于物种选择。
Altogether 148 species of 64 genera belong to 9 families on ornamental plants were recorded and narrated. Identification key for aphids and their hosts were made respectively.
首次系统全面记述了北京地区观赏植物上的蚜虫种类，共计9科64属148种，列出了蚜虫种类与寄主植物的系统检索表。
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