查询词典 ecosystems

This article constructed a dynamic radionuclide transfer model of ecosystems on the theoretical basis of compartmental analysis.

本研究使用库室模型或'隔舱模型'方法建立描述海洋生态系统动力学微分方程组和放射性物质在生物体内行为微分方程组。

Its mission is to acquire the knowledge needed for sustainable living and working in low-lying deltaic areas, with a focus on hydraulic and geotechnical engineering, geosciences and the integrated management of surface and groundwater and aquatic ecosystems.

沃润德教授作为荷兰皇家科学院生态学会三角洲分会的主任，该分会主要是探讨低洼三角洲地区的可持续生态需求，侧重于水文和地理技术工程，地球科学及地表水和水文系统的综合管理研究。

Regular tanker traffic in one of Earth's most fragile ecosystems is a disaster waiting to happen, so the Ecuadoran government is trying to go green.

经常在地球最脆弱的一个生态系统内用油轮运输是一个蓄势待发的灾难（问问阿拉斯加人就知道了），因此，厄瓜多尔政府正在努力走向绿化。

3Using long-term measurement of forest ecosystems, together with r elative data provided by forest resource inventory, hydraulic and meterorologica l departments, we estimate the various forest benefit values of Heilongjiang Pro vince, including those for visible and invisible products. Transferring the "pr oducts" to currency value using equivalent replacement of beneficial products f or currency and standard dimension, the total value is 498.687×108 yuan which takes up 32.7%of the total annual average provincial production (1522×108 yuan).

3引用多年森林生态系统定位研究结果，并参照森林资源调查、水利、气象等部门提供的有关数据，计算出黑龙江省森林各类效益值(有形产品和无形产品的产量)，通过等效益物替换和货币置换法进行&产品&的转换和量纲统一，最终得出黑龙江森林总效益值为498.687×108元，占全省(1990-1992)年平均总产值1522×108元的32.7%。

In order to promote the protection and utilization of mangrove ecosystem,this paper reviewed some ecological functions of mangrove ecosystems which can provide large quantity of organic matters,epeirogenic processes and shelterbelts,and protect dikes...

本文对红树林生态系统在生产有机物、维持热带亚热带河口生态系统、降低风速以及海水流速、防治和减轻灾难、截留碎屑形成陆地、保护海堤、吸附污染物净化水体、提供多种生境、维护生物多样性，以及形成优美的环境开展生态旅游等几个方面的生态服务功能进行了综述，旨在为红树林资源的保护与合理利用提供参考。

In addition, PBDEs are evaporable to some extent, and thus, they can undergo long-distance transport to remote ecosystems.

本文从生态化学行为和生态毒性两个方面综合论述了PBDEs在环境中的分布及存在水平、一般毒性效应和内分泌干扰行为，分析了当前研究中存在的问题，展望了PBDEs污染的研究方向。

Scientific evidence is springing up everywhere that indicates the massive and pernicious impact of the human species on the limited resources of Earth, its frangible ecosystems and life as we know it.

有越来越多的科学证据表明人类已经对地球上有限的资源、脆弱的生态系统和我们已知的生命产生了大规模的有害影响。

Root-derived organic carbon is composed of three compartments: root detritus, root eaudates and root symbionts, which represents a large important and potential C sink in forest ecosystems, The known responses of root derived organic carbon and heterotrophic microbes to elevated CO2 were reviewed. Overall, increases in root biomass, productivity, and exudation indicate an augmentation of C inputs into the soil via roots, although changes in root lifespan are still unclear and may modify this flux positively or negatively, Altogether, changes in root chemistry and morphology that may augment soil C storage under elevated CO2 include decreased N concentration and wider root diameter, Alternately, a shift in rooting depth upwards in the soil profile may increase average turnover rates of root detritus. Effects of CO2 concentration on C qualities of root exudates and root symbionts are the least understood components discussed here, Changes of soil heterotropic microbial activity and community under elevated CO2 still remained large uncertainties.

林木根源有机C包括根东通过根枯落物、根系分泌物和根共生菌周转3条途径向土壤输入的有机C，它是森林生态系统中一个重要的、潜在的C汇，综述了根源有机C与其微生物对CO2浓度升高的响应，虽然对根系寿命的变化尚不清楚，但CO2浓度升高将导致根系生物量、生产量、死亡量和分泌物的增加；同时，CO2升高亦促使根共生菌生物量的增加而增加了共生菌的C归还潜力，表明CO2升高使根源有机C的输入增加了，CO2农度升高情况下，根系化学性质和形态特征的这些变化均有利于增加土壤C的吸存；而根分布深度的降低则对土壤C吸存不利；CO2浓度升高对根分泌物和根共生菌质量的影响研究则极少，CO2浓度升高下土壤微生物活性和群落组成的变化存在较大的不确定性，目前CO2浓度升高下林木根源有机C对森林长期C吸存的贡献仍很不清楚。

The main reasons caused theses problems are as follows: beyond marine carrying capacity and environment capability by predatory and extensive manners, over-exploitation of bioresources resulted in the disturbance of marine ecosystem and the obstruction of matter and energy circulation. Marine environment pollution and unreasonable oceanographic engineering caused serious damage of marine entironments, weakness of marine eco-functions, and degradation of marine ecosystems. The population explosion as well as the trend of population towards coast inflicted tremendous pressure on marine resources and environment. The weakness of marine laws system and the infirmness of macroscopical control by government policies relulted in unreasonable utilization, inefficient management, and insufficient protection of marine bioresources.

其主要原因是：对海洋生物资源的掠夺性、粗放性开发，造成资源过度利用，超出海洋承载力及其环境容量，物质能量循环出现障碍，海洋生态系统失衡；海洋环境污染和不合理的海洋开发工程，造成生境破坏，生态功能减弱，生态系统退化；人口增长和趋海发展，给沿海资源环境造成巨大压力；涉海法律法规体系薄弱，国家宏观政策调控不力，未能合理利用和有效管理、保护海洋生物资源和海洋环境。

As a kind of irrenewable natural resources, soil has at least fix functions, which could spatio-temporally evolve, exchange and disappear during the transformation of natural ecosystems into the urban systems dominated and heavily managed by human beings.

作为一种非再生性自然资源，土壤的各种功能在城市化过程中强烈的人为活动影响下转化、演变和消失。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。