As the natural ecosystem, urban natural reserved area is the last habitat for indigenous species, which is different from natural conservation and urban greening.
城市自然保留地作为城市中残存的自然生态系统，是维持乡土物种生存的最后生境，其保护具有极其重要的意义。
Soil erosion is an important topic in the planning of soil and water conservation in the urban area.
土壤侵蚀等级的确定是城市水土保持规划中的重要问题。
Focus has been put on factors that can affect water conservation in urban area in China, and then the index system on urban water conservation is established.
重点分析了我国城市节水的影响因素，建立了城市节水评价指标体系。
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