These include the canvas extractors developed by the institute of forest genetics at placerville california .
其中包括加利福尼亚的泼拉崖维尔森林遗传研究所创造的帆布提取器。
Among the courses of study are tree physiology, forest ecology, forest genetics, hydrology, and watershed management.
课程有树木生理学、森林生态学、森林基因学、水文学和分水岭地理管理。
Forest fragmentation has immeasurable effects on birds. The population dynamics, population genetics and local evolution of birds are to some extent affected by the changes of environment.
森林生境片断化对生活在其中的鸟类产生着难以估量的影响，鸟类的种群动态、种群遗传和局部进化等都不同程度地受环境变化的影响。
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