Vegetation is a collectivity of the phytocommunity in a region and is a synthetical reflection about the ecological environment.

植被是一个地区植物群落的总体，是对于生态环境因素的综合反映。

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Vegetation cover is an important component of environmental factors, and is also the best indication to reflect the regional ecological environment.

植被是环境的重要组成因子，也是反映区域生态环境的最好标志之一。

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Meanwhile, in the process of ecological environment construction, the middle and high grade vegetation fraction degraded.

与此同时，在生态环境建设过程中，原有中、高覆盖度植被发生退化。

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To test their theory, the two researchers first needed to find ecological equivalents of the differentiation-triggering chemicals: two things whose relative concentrations affect the shape of patches of vegetation and which like both to spread and to transmute into one another.

ECONOMIST: Mathematical ecology