The variations of exergies and structural exergies along eutrophication   gradients in Chinese and Italian lakes

doi:10.1016/j.ecolmodel.2009.11.021

CORC > 北京大学 > 城市与环境学院

	The variations of exergies and structural exergies along eutrophication gradients in Chinese and Italian lakes
	Xu, Fu-Liu ; Wang, Jun-Jun ; Chen, Bin ; Qin, Ning ; Wu, Wen-Jing ; He, Wei ; He, Qi-Shuang ; Wang, Yin
刊名	ecological modelling
	2011
关键词	Exergy Structural exergy Trophic state index Chinese lakes Italian lakes ECOSYSTEM HEALTH ASSESSMENT TROPHIC STATE INDEX ECOLOGICAL INDICATORS DYNAMIC-MODEL PHYTOPLANKTON BIOMASS SIMILARITY INDEXES SHALLOW LAKE WATER RESTORATION BIOMANIPULATION
DOI	10.1016/j.ecolmodel.2009.11.021
英文摘要	Taking 29 Chinese lakes and 29 Italian lakes as two separate case studies, the paper presented the variations of exergies and structural exergies along eutrophication gradients in Chinese and Italian lakes. The exergies (Ex) and structural exergies (Exst) were calculated based on phytoplankton biomass (BA) and zooplankton biomass (BZ). A trophic state index (TSI) scaling from 0 to 100 was developed to classify trophic status for Chinese and Italian lakes based on three indicators, chlorophyll-a concentration (Chl-a, in mg/m(3)), total phosphorus (TP in mg/m(3)) and transparency in Secchi disk depth (SD in m). The relationships between TSI and Ex, Exst, total biomass, BZ/BA ratios were analyzed. The following results were obtained: (1) with the increase of TSI in Chinese and Italian lakes, there is an increasing trend for Ex, and a decreasing trend for Exst, generally. The obvious negative correlations exist between TSI and Exst, at the significant level of 0.01 for Italian lakes, and 0.05 for Chinese lakes. The obvious positive correlations exist between TSI and Ex, at the significant level of 0.01 for Chinese lakes, and for Italian lakes in Spring, Autumn and the all-year. (2) The structural exergy is more dependent on the ratio of phytoplankton biomass to zooplankton biomass (BZ/BA) than the exergy, and the exergy is more dependent on total biomass than the structural exergy. (3) The phytoplankton biomass (BA) and zooplankton biomass (BZ) are increased with the increasing TSI in Chinese and Italian lakes, and phytoplankton biomass (BA) increases more rapidly then zooplankton biomass (BZ) does. This results in the definite decrease of BZ/BA ratio with the increasing trophic status index. Such changes of BA, BZ and BZ/BA ratio could explain successfully the variations of exergies and structural exergies along eutrophication gradients in Chinese and Italian lakes. From the two separate case studies of Chinese lakes and Italian lakes, it could be concluded that exergy and structural exergy are feasible to serve as the system-level ecological indicators to give appropriate information on the trophic status of different lakes. (C) 2009 Elsevier B.V. All rights reserved.; Ecology; SCI(E); EI; 7; ARTICLE; 2,SI; 337-350; 222
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/161109]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Xu, Fu-Liu,Wang, Jun-Jun,Chen, Bin,et al. The variations of exergies and structural exergies along eutrophication gradients in Chinese and Italian lakes[J]. ecological modelling,2011.
APA	Xu, Fu-Liu.,Wang, Jun-Jun.,Chen, Bin.,Qin, Ning.,Wu, Wen-Jing.,...&Wang, Yin.(2011).The variations of exergies and structural exergies along eutrophication gradients in Chinese and Italian lakes.ecological modelling.
MLA	Xu, Fu-Liu,et al."The variations of exergies and structural exergies along eutrophication gradients in Chinese and Italian lakes".ecological modelling (2011).