This paper discusses basic character and transmutation of Yunnan's agricultural natural environment system safeguarding agricultural activities against natural calamity.
论述了保障云南省农业生产安全的农业自然环境系统的基本特征及其变迁。
This paper discusses basic character and transmutation of Yunnan's agricultural natural environment system safeguarding agricultural activities against natural calamity.
论述了保障云南省农业生产安全的农业自然环境系统的基本特征及其变迁。
应用推荐