Pests often target specific tree species and, if they become established, they usually remain as permanent components of the ecosystem.
害虫通常以特定的树种为目标，一旦形成，它们通常会成为生态系统的永久组成部分。
In America and Australia, for example, markets have been established to help companies countervail the ecosystem destruction they cause, especially to wetlands.
比如在美国和澳大利亚，一个帮助公司弥补他们对生态系统破坏——特别是指湿地——的市场已建立。
That's because the ecosystem already established in your gut determines how it absorbs and processes nutrients.
那是因为你的肠道里已经确立了生态系统，决定了它会如何吸收和处理营养物质。
An evaluating index system is established for degenerated estuarine ecosystem restoration.
摘要建立了退化河口生态系统恢复评价指标体系。
This article established a quite integrated the environmental quality evaluation index system city ecosystem from the angle of ecology. And evaluated the Quality of Shenyang environment.
从生态学的角度建立了较完整的城市生态环境质量评价指标体系，并对沈阳城市生态环境质量进行了评价。
Based on the method established, the trends of ecosystem health in the mining area being studied are evaluated, and the appropriate measures and Suggestions are recommended.
通过建立的方法，对研究矿区的生态系统健康趋势进行了评价，并提出了相应的对策和建议。
By taking Guiyang City as a case study, the indices for the natural ecosystem, society economy system and cropland pollution system were chosen and the land resource evaluation model was established.
以贵阳市区为例，选取自然生态系统指标、社会经济系统指标和农田污染系统指标，建立了土地资源评价模型。
A paddy field and fishpond simulation ecosystem was established to study the Fipronil pesticide environment behavior and its effects on crab and shrimp in the ecosystem.
通过建立稻田-鱼塘模拟生态系统，研究锐劲特农药在稻田-鱼塘模拟生态系统中的迁移、转化规律，及其对蟹、虾等水生生物的影响。
A field experiment was conducted to investigate the development rule of rice sheath blight in rice-duck-fish complex ecosystem. A model was established based on experiment data.
通过田间试验，对稻-鸭-鱼共栖生态系统中水稻纹枯病的发生规律进行了研究并建立了相应的数学模型。
In this paper, the grey model groups of 10 ecosystems of the world is established by the grey theory and the world ecosystem of 2000 is also predicted.
本文利用灰色原理，建立了世界十大生态系统的灰色模型群，并对2000年进行了预测。
The prevailing feedback loop of the ecosystem was established according to system simulation.
提出了系统的主导反馈环，进而对影响系统运作的核心因素进行了分析。
Secondly, using the AHP method, an integrated spatial analysis model for Lashihai ecosystem health study was constructed comprehensively and the 6-level assessment criterion has been established.
然后，采用层次分析方法（AHP），融合自然综合指标、人文因素指标在内的生态系统健康综合评价模型，确定6级的生态系统健康评估标准；
An evaluating index system is established for degenerated estuarine ecosystem restoration.
建立了退化河口生态系统恢复评价指标体系。
An evaluating index system is established for degenerated estuarine ecosystem restoration.
建立了退化河口生态系统恢复评价指标体系。
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