Because complex species interactions may be involved, identifying a keystone species by removing the species and observing changes in the ecosystem is problematic.
由于其中可能涉及复杂的物种相互作用，通过移除一个关键物种并观察生态系统的变化来确定该物种是有问题的。
The reef, which in actuality is a collection of thousands of distinct coral reefs, has been designated a World Heritage site for its sheer beauty and uniquely complex and delicate ecosystem.
大堡礁，实际上是一个独特的珊瑚礁群，由于其纯粹的美丽和独特内涵以及微妙的生态系统，已被指定为世界遗产地。
Since the web went mainstream in 1993, our media "ecosystem", if you like, has become immeasurably more complex.
自1993年网络开始变成主流，我们媒体的“生态系统”，无论你喜欢不喜欢，已变得不可估量的更加复杂。
Readers are being woven into the increasingly complex news ecosystem as sources, participants and distributors.
读者们正被编织进一个日渐复杂的新闻生态系统，在那里他们即是消息来源，又是参与者，也是传播者。
It is a land of natural ecosystems into artificial ecosystem process, is also a natural, economic, and social factors at the complex process.
它既是一个把土地的自然生态系统变为人工生态系统的过程，也是一个自然、经济、社会诸因素综合作用的复杂过程。
The results showed that methane emission had obvious daily and seasonal variation law in rice-duck complex ecosystem.
结果表明：稻鸭复和生态系统中甲烷排放具有明显的日变化规律和季节变化规律。
The study on ecological, economical and social benefits of rice-duck-loach complex ecosystem.
稻—鸭—泥鳅复合生态系统的经济效益、生态效益和社会效益。
The article studied the influence of ducks in a rice-duck complex ecosystem as well as its natural enemies and diseases, insects, weeds and pests.
研究鸭子在稻鸭复合生态系统中对蜘蛛及病、虫、草害的影响。
Main results for this study are as follows: 1. The study on methane emission law of wetland rice-duck complex ecosystem.
主要研究结果如下。1 .湿地稻-鸭复合生态系统甲烷排放规律的研究。
Each of the model lumps is a big system, and the municipal complex ecosystem is made up of them.
这个模型由几个模块组成，每个模块都是一个大系统，共同构成城市复合生态系统。
The animal's intestine is a complex ecosystem inhabited by microorganisms, including pathogenic bacteria.
动物的肠道是一个复杂的微生物生态系统，由各种微生物组成，包括致病菌。
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。
The study on soil physical and chemical characteristics of wetland rice-duck complex ecosystem.
湿地稻-鸭复和生态系统的土壤理化性状的研究。
The study on the residual quantity of methamidophos in the soil of rice-duck complex ecosystem of wetland.
甲胺磷在稻-鸭复合系统土壤中残留量的研究。
The quality of paddy soils in a wetland rice-duck complex ecosystem was studied by plot experiments.
通过田间试验对湿地稻-鸭复合生态系统的稻田土壤质量进行了研究。
The rumen of ruminant was a complex micro ecosystem, which there was a dynamic balance that was both collaborative and constraints between rumen microorganisms and host, and also between microbes.
反刍动物瘤胃是一个复杂的微生态系统，瘤胃微生物与宿主之间、微生物与微生物之间处于一种既协同又制约的动态平衡关系。
Biogas system is the pivot in material recycling and energy transformation of a complex agro-ecosystem.
沼气发酵系统是复合农业生态系统中物质循环和能量转化的枢纽。
The Amazon River Basin boasts the largest river system on Earth and harbors an ecosystem that is tremendously complex.
亚马孙河流域拥有地球上最大的河系，能为极其复杂的生态系统提供庇护。
The influence of methamidophos and acetochlor on the amounts and activity of methanogens in the soil of rice-duck complex ecosystem of wetland.
甲胺磷和乙草胺对稻-鸭复合系统土壤中甲烷细菌数量及其活性影响的研究。
What's more, the direct economic benefit of the rice-duck complex ecosystem was higher than that of the conventional paddy fields.
湿地稻-鸭复合生态系统直接的经济效益也远高于常规稻田。
However, as a complex adaptive system, the business ecosystem not only differs from the natural ecosystem, but also differs from the cluster and the value network.
但是，作为复杂的适应性系统，商业生态系统不仅与自然生态系统不同，而且与集群、价值网络也有所不同，它具有自组织、涌现性、协同进化、适应性等基本特性。
The improvement of soil oxidation-reduction status of wetland rice-duck complex ecosystem was one of the reasons which resulted in decrease of methane emission.
湿地稻-鸭复合生态系统土壤氧化还原状况的改善是降低甲烷排放的原因之一。
The study on the amounts of methanogens in the soil of rice-duck complex ecosystem of wetland.
湿地稻-鸭复合系统土壤中甲烷细菌数量研究。
The nutrients relationship between the primary producers and decomposers in forest-ecosystem is a mutua-competitive and complex relationship.
森林生态系统中，初级生产者和分解者之间的养分关系，是一种既互利又竞争的复杂关系。
Agricultural complex system has the special functions and how to comprehensively analyse and evaluate it is till the problem of ecosystem research.
农业复合生态系统是具有特定功能的复合体，如何全面地分析和评价农业复合生态系统，目前仍是困扰生态系统研究的难题。
As a result of the evaluation an optimal model of artificial complex ecosystem circulation for the agricutural-forestry-medi…
提出了青城后山绞股蓝基地农林药复合生态系统良性循环的优化模式。
The wetland is the important constituent of land ecosystem, it is natural complex compound which has special function and forms by amphibious mutual effect.
湿地是陆地生态系统的重要组成部分，它是由水陆相互作用而形成的具有特殊功能的自然综合体。
The internal gut of insects is a complex micro-ecosystem, in which inhabits a large and varied microbial community.
昆虫消化道内是一个复杂的微生态系统，有大量的微生物存在。
The internal gut of insects is a complex micro-ecosystem, in which inhabits a large and varied microbial community.
昆虫消化道内是一个复杂的微生态系统，有大量的微生物存在。
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