The factors affecting soil fertility are: river harnessing, fertilizer application, and the changes in cropping system and land utilization after the adoption of high yield hybrid verities.

影响肥力变化的因子包括河流治理、施肥、高产品种使用后种植制度和土地利用程度的变化等等。

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Construction of the mass rapid transit system is of great importance both to rational utilization of the economical resource and optimization of overall arrangement of urban land use.

大运量快速交通系统建设对于合理利用城市经济资源、优化城市土地利用布局具有深远意义。

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This paper takes the typical mountain city-Chongqing as sample to deeply study the urban traffic system and land utilization in main urban area of Chongqing.

本文以山地城市中的典型代表—重庆为例，对重庆市主城区的城市交通系统与土地利用进行了深入的研究。

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