然而，有时看似良性的引入却形成了滑稽的环境，或使生态系统陷入困境。
However, sometimes a seemingly benign introduction creates environmental travesty and ecosystem despair.
水是维持生态系统良性循环的根本。
玛纳斯河流域农业生态系统良性演替需建立在绿洲资源要素时空优化配置及其协调开发利用上。
Positive succession should be based on the temporal and spatial distribution and the coordinated utilization of oasis resource factors on the agro-ecosystem along Manas River.
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