Rural landscape planning case study of Nanhua State Farm

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河北省地表水环境污染防治对策研究

根据大量地表水环境质量监测资料，概述河北省地表水环境的严峻形势，分析地表水环境污染问题与成因，在重点评价河北省环境保护“十五”规划中地表水环境污染防治对策的基础上，提出了进一步增加污水集中处理能力，提高中水回用水平；调整水环境功能区划，增设尾水管理功能区；因地制宜，采取现实有效的污水综合治理措施等对策。     

优化产业链条构建生态工业体系——孝义市发展循环经济的调查与思考

孝义是一个以煤为主的资源型城市，工业结构以煤铝开采和加工业为主体。改革开放以来，煤焦比重进一步增加，煤炭、焦化等重污染行业，在工业总能耗中占据了主要地位，使得工业结构更趋单一。这种结构最突出的问题就是环境污染和生态破坏严重，主要污染物多年一直超标，严重危害着孝义市可持续发展的生存支持能力、发展支持能力和环境支持能力。     

Effects of alternating temperatures on development and reproduction of the armyworm,Mythimna separata (Walker)

Effects of cycling and constant temperature on development and reproduction of the armyworm, Mythimna separata (Walker) were investigated by rearing the insects on the artificial diet under temperatures covering low(16-24℃ vs. 20 ℃ ), medial(20-28℃ vs. 24℃ ) and high(24-32 ℃ vs. 28 ℃) regions. In the low region, all the immature stages of the insect developed significantly faster under alternating temperatures than at corresponding constant temperatures. For the medial region, their development was little affected by variable temperatures. For the high region, developmental durations tended to be longer under cycling temperatures except egg stage.Mean fecundities of the adult moths markedly increased under cycling temperatures as compared with those at respective constant temperature in all regions.Possible reasons for effect of alternating temperatures on insect development are discussed in some details.     

Effects of atmospheric gases on terrestrial plants and critical levels of air pollution

An integrated approach was developed to determine the critical levels of air pollution for ecological standard setting based on the unified index of biological response, by taking into account the effects of all pollution components simultaneously. An empirical model of plant productivity was taken as the dose response model for gaseous pollutant effect on the productivity of trees and the annual productivity of plants was used as the above mentioned index. The CO2 increase in the lower atmosphere was considered to potentially increase plant productivity and NO2 was estimated as neutral while being dangerous for plants as a chemical precursor of ozone or as a source of acidification. The maximum permissible chronic O3 and SO2 levels for trees were estimated and it was found that O3 is much more phytotoxic, as compared to SO2 , with a rather narrow range of permissible levels (27-33 ppb) which complicates its monitoring and control.