信息对城市的重要性 城市系统的信息流 信息流对行业的影响 城市系统信息流的应用

探讨转基因食品的伦理问题 转基因食品概况 转基因食品的安全分析

气候变化-中国在行动 气候变化简介 气候变化-世界在行动

城市的氧气代谢 城市生态系统的物质代谢概述 城市的食物代谢 城市的水代谢

概述 城市的食物代谢 城市的水代谢 城市的氧气代谢

中国当代城镇化进程 时代背景 中国古代城镇发展 全球城镇化进程

Forest Production 1. HARVESTING COSTS IN THE SOUTH 2. PRODUCTION THEORY 3. PRODUCTION AND COST OF HARVESTING SOUTHERN TIMBER 4. CONCLUSION

Defining the production technology and technical efficiency The measurement and decomposition of cost efficiency Empirical methods Technical efficiency in southern U. S. pulpwood harvesting

Data on world forest extent ,plantation extent ,and forest management and ownership provide the basis for monitoring the status of the world’s forest, as well as analyzing the effects of markets and government on those forests

This chapter discusses privately owned forests and timber management in a market economy, including : (1) private property rights and tenure (2) landowner objectives (3) landowner characteristics (4) markets (5) government policies impacts