[Objective]We aimed to study the influencing factors and comprehensive management of environmental problems in Dongping Lake.[Method]Based on field investigation and historical data,environmental problems of Dongping Lake and their influencing factors were analyzed,and seven measures about comprehensive management of environmental issues and ecological protection of Dongping Lake were put forward.[Result]During recent years,the content of total nitrogen and total phosphorus in Dongping Lake showed a decreasing trend,but the water was still in the eutrophic state.The environmental problems of Dongping Lake,like flood,drought and pollution,are closely linked to natural and man-made factors,such as regional seasonal precipitation,industrial and agricultural pollution,etc.In order to control the environmental problems of Dongping Lake,we should strengthen the construction and management of wetland nature reserves,develop ecological agriculture,establish an integral system for environmental monitoring and information management,reinforce propaganda and education to improve residents' environmental consciousness,etc.[Conclusion]The research could provide scientific references for the comprehensive management of environmental problems in Dongping Lake and its basin.
LU Ming,LIU Jia-zhen,CHEN Yong-jin School of Environment and Planning,Liaocheng University,Liaocheng 252059,China
[Objective] The aim was to study the distribution of vegetation and its relationship with environmental factors in Yellow River estuarine wetland. [Method] According to the data of the plant sample investigation and the related environmental factors in Yellow River Delta National Nature Reserve in 2009-2010, the plant community changes and its relationship with environmental factors in temperate estuary wetland were analyzed. [Result] There was little vegetation in the Yellow River delta and the distribution of plant was influenced by environment. Judging from the vegetation structure, the vertical structure of vegetation in the supralittoral zone zone vegetation cover included arbor layer, shrub layer and grass layer. The importance of grass was larger than shrub and arbor. In the intertidal zone, the vertical structure of plants was divided into shrub and herb layers. Judging from the variety, the species in the supralittoral zone was higher than that in the intertidal. The first principal component elected by Principal Component Analysis better reflects the salt of the study area,and the second principal component better reflects nutrient information. Regression analysis showed a positive correlation between importance value and the total salt content and electrical conductivity. In other words, if the total salt content and electrical conductivity increases, the importance value rose. However, the diversity index decreased as the total salt content and electrical conductivity increased. [Conclusion] The study provided theoretical basis for the ecological protection of vegetations and formulation of regional policies.
KOU Ming-juanLIU Jia-zhenCHEN Yong-jinZHU Hai-yongLU Ya-kunLU Ming
