在生态系统中的生物成分之间通过能量传递关系存在着一种错综复杂的普遍联系，这种联系像是一个无形的网把所有生物都包括在内，使它们彼此之间都有着某种直接或间接的关系，这就是食物网的概念。
The goal of a trophic baseline is to reflect the isotopic signature of the primary source of materials and nutrients for the food web.
同位素基准的目的是反映食物网生物最初物质来源的同位素特征。
参考来源 - 氮稳定同位素基准的可变性及对营养级评价的影响Conversion of abundance of soil biota into biomass carbon after functional groups classification based on the feeding habits was proved much necessary to know the position and function of functional groups in food web.
划分生物营养类群并将其数量转换为生物量,有助于更清楚地其在食物网的功能和地位。
参考来源 - 甲基溴替代技术条件下温室土壤生物群落特征及地下食物网研究·2,447,543篇论文数据，部分数据来源于NoteExpress
科学家们已经发现了在食物网中起作用的一些关键原理。
Scientists have found out some key principles operating in food webs.
即使新的种群属于不同物种，它也可以大致填补已灭绝种群空出的生态位，保持食物网的完整。
Even if the new population is of a different species, it can approximately fill the niche vacated by the extinct population and keep the food web intact.
支持这一观点的是，长期存在的顶极群落通常比先锋群落有更复杂的食物网和更多的物种多样性。
Support for this idea came from the observation that long-lasting climax communities usually have more complex food webs and more species diversity than pioneer communities.
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