The total phosphorus, total nitrogen, the amount of oxygen consumption, biomass and transparency of 18 lakes are analyzied, and nutritive classifications of 18 lakes are judged by the main component analysis.

Study on feeding habit and trophic level of redlip croaker in Changjiang esturary;

Understanding the food sources and trophic level of macrofauna is a foundation to study the material and energy flux in the ecosystem.

Based on the survey results of primary production and other research data in the fishing grounds of the East China Sea,biomass of continental fishery resources were estimated using Parsons and Cushing trophic level method.

Preference of omnivorous natural enemy Cyrtopeltis tenuis Reuter for plants in greenhouses in a tritrophic system;

Taking bark beetle and long-horned beetle as the examples,this paper summarized the research progress on the tritrophic system of tree-trunkborer-insect natural enemy association,with the past ten years research results on semiochemicals release source,active compounds identification,and release dynamics of volatiles introduced.