追溯和重建沈阳地区的生态环境变迁史，揭示城市环境质量与树木年轮变异之间的相关规律。
The results. h. w that under pollution condition, tree ring width and its element content varied sharply, which are closely …
地史时期森林的变迁主要是由于生态环境的变动；
The former is due to the variations of the ecological factors.
血吸虫病的流行给社会带来了诸方面的影响，这包括对农村人口的变迁、乡村经济、生态环境等的影响。
The prevalence of the schistosomiasis brings various influence, including population vicissitude, the village economy, the ecological environment and so on.
利用修正后的“流域水资源承载力平衡指数(IWSD)”方法，研究了海河流域1960 - 2030年水生态环境状况的变迁过程。
Using a modified method of Index of water Supply and Demand (IWSD), this paper studies the transitional track of water ecosystem in the Hai River Basin from1960to2030.
本文阐述了平潭县生态环境的基本特征及其历史变迁的三个主要阶段。
This article expounds the essential character of ecological environment and its three major steps of evolution in the history periods in Pingtang county.
在短暂的人类历史时期，土默特平原经历了由草原生态环境到农田生态环境的变迁过程。
Throughout short human history, Tumote Plain experienced the process from grass ecological environment into farmland ecological environment.
从地名刻画的自然生态环境及变迁和描绘的昔时文化生态环境两大方面讨论乐山乡土地名的文化内涵。
The paper also discusses the cultural connotations of these place names of Leshan County in terms of the natural ecological environment and its …
从地名刻画的自然生态环境及变迁和描绘的昔时文化生态环境两大方面讨论乐山乡土地名的文化内涵。
The paper also discusses the cultural connotations of these place names of Leshan County in terms of the natural ecological environment and its …
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