研究历史上永定河流域森林变迁情况，发现辽金时代是一个转折点。
Sudies on the historical forest change in Yongding River Basin have found that Liaojin Dynasty is the turning point.
历经千年的洗礼，在面对地震、气候变暖、森林砍伐、过度放牧等自然或人为的变迁时，它们依旧脆弱不堪。
While they are strong enough to have survived thousands of years on earth, they are so fragile in the face of earthquakes, global warming, deforestation, overgrazing as well as natural erosions.
欧卡河的左岸遍布着茂密的森林，19世纪60年代一位名为考夫曼的俄罗斯教授在此注意到一种奇怪的变迁性物种。
All the left bank of the river Oka is covered with a dense forest. In the 60s of the XIXth century one Russian professor Kaufman took notice of a strange transitional nature in this place.
所以这些天然森林如果我们愿意，它们还可以有很大的贡献，帮助澳洲处理气候变迁的问题。
So these natural forests, if we allow them, still have an enormous contribution to make to helping Australia address the climate change problem.
传统林业转型之深层动力，在于现代社会森林需求结构的变迁。
The profound motive of such transfer lies in the structural change of modern demand to forests.
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.
文章沿时间顺序对黑龙江省森林面积和蓄积量的数据的参考价值进行考释，以揭示黑龙江省森林资源的变迁。
The paper clarifies and explains the data about the forest area and the volume according the time sequence, and reveals the changes of forest resources in Heilongjiang Province.
文章沿时间顺序对黑龙江省森林面积和蓄积量的数据的参考价值进行考释，以揭示黑龙江省森林资源的变迁。
The paper clarifies and explains the data about the forest area and the volume according the time sequence, and reveals the changes of forest resources in Heilongjiang Province.
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