而且一种生态系统越来越多物种的离开，也意味着沼泽、树林或池塘将失去其独特性，变为其他，这是一种体系水平的灭绝。
And taking more and more species from an ecosystem raises concerns that the swamp, woods or pond will lose its distinctive traits, becoming something else, in a form of system-level extinction.
像河流和小溪那样的流水称为激流生态系统；像湖泊和池塘的死水称为静水生态系统。
Flowing waters like rivers and streams are called lotic ecosystems; standing water like lakes and ponds are lentic.
而每个池塘都有其独有的生物序列，从浮游生物到鱼类各不相同，这一特点甚至适用于人造的池塘生态系统。
Each pond often has a unique array of species, from plankton to fish-even if it was created by scientists.
这一发现意味着，恢复一个生态系统的原貌——不管是一个小小的池塘，或是一整条海岸线，都绝非易事。
That means restoring an ecosystem—whether a pond or an entire coastline—is no easy task.
一个池塘就是一个复杂的微型生态系统，其中遍布各种生物(甲虫尤其兴盛)和营养物质。
A pond is a rich ecosystem, full of nutrients and life (and lots and lots of beetles).
每块屋顶的排水系统收集到的雨水定向地流入一个池塘。
Rainwater collected in guttering around the flat roof of each block is directed out into a pond in the grounds.
通过将氧气从湖、池塘和蓄水池的底部排入，所有水层都变得有活性，原本的自然系统恢复。
By putting oxygen into your lake, pond, or reservoir from the bottom all levels of water are made livable and nature's own system is restored.
本发明涉及一种养殖池塘的水质在线监测方法和系统，属于池塘养殖领域。
The invention relates to an on-line water quality monitoring method and an on-line water quality monitoring system of aquaculture ponds, which belong to the field of pond culture.
该系统训练后的神经网络模型，能实现对养殖池塘水质的预测。
The trained neural network model of this system, network model after training of can be able to predict water quality of the breeding ponds.
报道了三种模型池塘生态系统即池塘微宇宙、池塘中宇宙和模型水陆生态系统的设计、组建与应用研究结果。
Three typos of model pond ecosystems have been designed and used to assess ecological effects of insecticide based on ecosystem level.
包括公用供水系统、公用井、私人用井、灌溉用井、水库、河流、池塘等。
The source(s) of water. For a given supply this could include municipal water, community well, private well, irrigation well, water course, cistern, reservoir, river, pond and lakes.
包括公用供水系统、公用井、私人用井、灌溉用井、水库、河流、池塘等。
The source(s) of water. For a given supply this could include municipal water, community well, private well, irrigation well, water course, cistern, reservoir, river, pond and lakes.
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