单词trophic level
un.: 营养水平
网络: 营养级；食性层次；营养阶层
（生态系统的）营养级:
each of several levels in an ecosystem(= all the plants and animals in a particular area and their relationship with their surroundings) . Each level consists of living creatures that share the same function in the food chain and get their food from the same source.
营养水平
The percentage of usable chemical energy transferred as biomass from one trophic level to the next is called ecological efficiency .
当生物量从一个营养水准到下一个叫做生态的效率时，可使用化学的能源的百分比转移。
A photosynthetic green plant or chemosynthetic bacterium, constituting the first trophic level in a food chain; an autotrophic organism.
生产者，自养有机体构成食物链上的第一级营养层次的可进行光合作用的绿色植物或化能合成的细菌；
ecological efficiency The efficiency of transfer of energy from one trophic level to the next.
生态效率从一营养阶层到下一阶层的能量传递效率。
The next best way to quantify the amount of protoplasm in each trophic level is to weigh it.
确定每一个营养阶层原生质总量的第二个好办法是称重。
The first and lowest trophic level contains the producer, green plants that convert solar energy to food by photosynthesis.
第一层或称最底层营养水平包括生产者——通过光合作用将光能转化成为化学养料的绿色植物。
Herbivores occupy the second trophic level and are primary consumers: they eat the members of the first trophic level.
第二营养水平为草食动物，或称初级消费者，它们以第一营养水平的成员为食。
Effects of volatiles from different trophic level on foraging behavior of Aphidius avenae.
不同营养层次挥发物对燕麦蚜茧蜂寄主搜寻行为的影响。
Protozoan community character in relation to trophic level in the Beijing section of the Juma River
拒马河北京段原生动物群落特征及其对河流营养状况的指示
Changes in trophic level of marine catches in the East China Sea region
东海区海洋捕捞渔获物的营养级变化研究