Assessing changes of trophic interactions during once anthropogenic water supplement in Baiyangdian Lake

• DOI: 10.1016/j.proenv.2010.10.126
• Publication Date: 2010-12-11T04:20:52Z
• Authors: Ying Yang; He Chen; Zhifeng Yang
• Keywords: Trophic state index

Abstract Baiyangdian, located in Hebei province, is the biggest freshwater lake North China. Since 1960s, due to increasing human activities and climate change, this area has suffered from markedly shrinking drying up several times. In current situation, anthropogenic water supplement plays a very important role maintain wetland's existence development, 1981 2003 approach had been already carried out 15 But until now there few study aspect of whole ecosystem level responded supplement. we used Ecopath model analyze changes ecosystem's structure function connecting with once event which started middle September 2009. Based on field experimental data October 2009, two mass-balance models Baiyangdian Lake were developed compare differences energy flow process, trophic composition other system character indexes during periods. As results show, October, biomass proportion first distinctively increased but higher declined, meanwhile total primary productivity/total respiration (TPP/R) by 12.07%, omnivorous coefficient (SOI), Finn's cycling index (FCI), average path length decreased 4.16%, 20.13%, 23.4% respectively. Most change directions are contrary natural processes meant that interactions organics weakened, maturity degraded further became more vulnerable external disturbance after time compensation.