生物量

The study of the photosynthetic and growth indices versus stress intensities shows that Caryopteris mongholica Bunge strengthens its adaptation to water stress with the reduction of net photosynthetic rate, transpiration rate and Maximum quantum efficiency of PSⅡphotochemistry, and the weakening of biomass accumulation and growth rate that are accompanied with a better water use efficiency and an increased Root/Shoot Ratio, and that the provenance of Inner Mongolia TUZUOQI is of the best physiological indices in water deficit.

通过测定不同水分梯度、不同种源的光合生理与生长指标表明：蒙古莸通过降低光合效率、蒸腾速率和最大光化学效率，减缓生长和生物量积累，提高水分利用效率和根冠比来适应水分胁迫。在水分胁迫下，蒙古莸光合能力的下降是引起其生长减缓的重要原因。从蒙古莸光合能力与生长综合考虑，内蒙古土默特左旗种源是在水分胁迫下表现最优良的种源。

By focusing on the coupling of water and fertilizer and using all-purpose regression design with four factors and five levels, and based on pot experiments and quantitative analysis, the coupling effect of water and fertilizer on Casuarina equsetifolia biomass was studied in order to solve the inconsistency problem of water and fertilizer supply on coastal sandy land.

针对滨海沙地因水肥不协调而形成大面积低效林分的问题，以水肥耦合为中心，以1年生木麻黄幼苗为研究对象，采用四因子五水平二次通用旋转组合设计，利用盆栽试验和定量分析的方法，研究探讨了在不同水肥条件下，水、N、P、K四因子对木麻黄生物量的影响。

With static experiments, the authors investigated the biomass change of Ceratophyllum demersum and Microcystis aeruginosa cultured in Hoagland's solution with different concentration levels of Microcystis aeruginosa.

通过静态模拟实验，比较了单独培养和共生培养下，不同初始藻密度时金鱼藻生物量和铜绿微囊藻密度的变化。

During the experimental conditions, the activitys of SOD, POD and MDA of Ceratophyllum demersum L changed greatly, and raised rapidly in the late of experiment, which indicated that those two submerged macrophytes got more nutrient stress than Myriophyllum spicatum L, and the nutritional stress-resistant ability of Myriophyllum spi-catum L was higher than those two submerged macrophytes in the medium nutritional condition.

在本试验条件下，黑藻生物量小，而金鱼藻SOD活性、POD活性和MDA质量分数变化幅度大，在试验后期急速上升，表明这两种沉水植物受到的营养盐胁迫较狐尾藻大，而狐尾藻在中营养水平下的耐营养盐胁迫能力较强。

Phytoplankton biomass increase coincided with the decrease in large Cladocera density and size.

浮游植物的生物量增长与大型枝角类密度和体型下降相一致。

One pond lacking submerged macrophytes could maintain very low phytoplankton biomass owing to large Cladocera grazing alone.

在一个缺乏大型沉水植被的池塘可能会维持较低的浮游植物生物量由于大型枝角类的单一摄食。

Tissue composition analysis, nutrient enrichment and starvation treatments, bioassay and in situ extracellular alkaline phosphatase activity determination showed that growth of Sargassum duplicatum, Codium edule and Ulva latuca were limited by phosphorus during the early growth period while nitrogen during the fast growth period. Growth of Enteromorpha linza, Gracilaria coronopifolia and Laurencia papillosa were limited by phosphorus.

南湾及眺石海水优养化可能是造成大型海藻单位面积生物量明显增加的原因，藻体营养分析、室内营养盐添加与不添加处理、bioassay及insitu 细胞外磷酸分解酵素活性证明重缘叶马尾藻、食用松藻及大石莼的营养盐限制因子在初期是磷而快速生长期是氮而浒苔、伞房龙须菜及乳头凹顶藻是磷。

In the present study a link was established between copper accumulation in hyperaccumulator and non-accumulator species of Commelina communis and its responses of antioxidative enzymes, including superoxide dismutase, guaiacol peroxidase, and ascorbate peroxidase.

我们发现，鸭跖草一个亚种可以在体内超积累大量的铜，并且生物量很大，还发现鸭跖草不同植物亚种间对铜的吸收有不同的生理反应，其中有一种超积累植物叶片中可以积累0.1%的铜。

It is shown from the assessment results that (1) both the TN and TP fluxes discharged from the Changjiang River to the Changjiang River estuary sea area increased continuedly, the DIN concentration in the sea areas increased continuedly, and the Si concentration decreased continuedly, which resulted in the significant changes in N/P/Si ratios;(2) the chlorophyll a concentration in the sea areas increased continuedly, and the significant changes in community structure of phytoplankton occurred;(3) the species and biomass of benthos declined greatly, and the bottom oxygen-poor water area increased significantly;(4) the range and occurrence frequency of red tide events in the sea areas increased greatly, and the algal toxic infection events of mussel were frequently found in the sea areas.

结果表明，长江向长江口海域输送总氮和总磷通量持续增大，长江口及其邻近海域无机氮浓度持续增高而硅浓度持续下降，并由此导致N/P/Si与比值的显著变化；该海域叶绿素a浓度持续增大，浮游植物群落结构也发生了显著变化；该海域底栖生物种类和生物量都大大减少，底层水低氧区面积也显著扩大；该海域赤潮事件无论是规模还是频率都大大增加，藻类毒素DSP/PSP贻贝传染事件也时有发生。

From Chaotianmen to Zigui,the Shannon-Weaver diversity index of phytoplankton changes undeely.4 the impact of sediment deposition on zooplankton in the waters studiedAccording to the results of the experiment, we had learnt that the species composition of zooplankton sampled had the same tendence-the species was from less to more, and the biomass was also gradually increasing. Particularly Copepoda had increased significantly in the type and quantity. The main of zooplankton at each sampling situs were protozoa and rotifers.

朝天门江段到秭归江段的浮游植物的Shannon-Weaver多样性指数呈波浪式变化，整体有下降趋势。4研究水域泥沙沉降对浮游动物的影响从本次实验的结果来看，四次采样浮游动物种类组成都有同一个趋势：种类由少到多，生物量也逐渐增大，特别是桡足类在种类和数量上都增加明显，各采样点的浮游动物以原生动物和轮虫为主。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。