In order to explore the distribution characteristics of soil carbon and nitrogen in arid and semia-rid areas,contents of soil organic carbon( SOC) ,total nitrogen( N) ,NH4+-N and NO3--N and soil physi-cal characteristics were investigated in three 20 year-old artificial forests ( Platycladus orientalis,Robinia hispida,Quercus variabili) in southern foot of Taihang mountain. The results showed that with the increase of the soil depth,bulk density of soil increased in three artificial forests;soil moisture content and soil capi-llary porosity decreased;contents of SOC,N(total N,NH4+-N and NO3--N) decreased; overall,for the contents of SOC and total N,Robinia hispida artificial forest was the highest,Platycladus orientalis artifi-cial forest was the lowest. The C/N ratio of soil profiles had no significant differences with the value from 6 . 44 to 12 . 00 . SOC content and soil moisture content were all significantly positively related with the contents of total N,NH4+-N and NO3-N ( except Platycladus orientalis artificial forest) in three artificial forests;the soil bulk density was negatively related with the contents of SOC,total N,NH4+-N and NO3--N,but only significantly related with the contents of SOC,NH4+-N and NO3--N in soil of Platycladus orien-talis artificial forest.

The article analysis the manufacturing process of a beer company with the method of life cycle assessment(LCA).A cleaner production executive plan is put forward based on the environmental influence caused by the inner factor of the enterprise.The plan is put into executive and benefit ecologically,economically and socially.The author also discusses the application foreground of LCA in cleaner production.

The construction of "Zheng-Bian integration" has the important strategic position in the outline of Henan province during "the 11th five-year plan".Based on the landscape ecology principle,and ecological,amusement and rest,economical function and protection,multi-purpose,integrity principle of ecological corridor,the paper put forward the rational suggestion about Zhengzhou-Kaifeng ecological corridor construction and the promotion urban cluster big economy sustainable development.We should complete the ecological corridor whole plan to promote cities ecosystem structural optimization;form the entire ecosystem organism to avoid the landscape fragmentation;do well the ecological patch construction to promote ecology function area development;establish safeguard system in ecology construction process.

党员是党的肌体的细胞和党的行为主体,党的先进性最终要靠党员的先进性来体现。保持党员队伍的先进性是保持党的先进性的基础,也是基层党组织的一项经常性的重要工作。高校大学生党建工作要紧紧围绕保持党员队伍先进性,紧密结合大学生特点,在发展党员上使真劲,在理论武装上用真功,在全面培养上出实招,在制度建设上做文章,努力建设高素质的党员队伍。

通过采用UNI问卷,共随机抽取河南农业大学2000级新生642名,在学习需求、个人需求、择业需求三个维度、12个因素方面进行调查,研究结果表明大学生在这几个方面都有较高的需求,且无性别显著差异;在个别项目上需求相对较低,但个体差别较大.