[Objective] The research aimed to study the presence form of carbon in straw returning process under different environments.[Method] Through controlling factors such as soil moisture content,ways of returning,returning amount and time duration,the soil microbial producing carbon dioxide through respiration,the soil carbon,returning rate and loss rate were determined.[Result] By controlling the external conditions artificially,the carbon in returned straw was converted more to the organic form than greenhouse gas which was also from the straw carbon.[Conclusion] The returning effect was optimized under the condition of moisture content of 45% and total straw crush of 67% returned to soil for 20 days.

This paper analyzed production and consumption situation of fossil fuel in Sichuan province.It showed that fossil fuel in Sichuan suffered from insufficiency,low quality,difficult mining,contradiction between production-consumption structure and energy storage structure,high intensity and low utilization in energy consumption and high carbon dioxide emission.Under the low-carbon development with the consideration of economics and environment,the proposals for fossil fuel development in Sichuan province are put forward.

The saline-alkali soil had an aquifer after flood irrigation,and the high humidity interface of the aquifer affected the flux of water and salt migration of the layer under the surface.Four self-made liquid films of different thickness were spread,and the moisture content,salt content and pH value of the soil were determined.The result showed that liquid film had the water retention and the effect of restraining secondary salinization of the soil;the spreading of liquid film restrained the rate of water and salt migration,and the soil may be alkalized;the most suitable thickness of liquid film was 4～6 mm,and the result of the film which was in the thickness range was the best.

对新疆盐碱地排碱渠渠水、水渠水、井水和塔里木河水水样进行了分析：其总盐量分别为12 915、11 352、9 980、1 421mg/L,根据水质评价标准当地水样主要有害盐分离子为Na＋、Cl-,除塔里木河水外其他水样含盐量均严重超过了农业灌溉用水标准,未经任何处理的高盐农业废水对地下水体和公共水体都造成了一定的盐污染。对比分析各种水除盐方法,初步讨论采用价格低廉且具有良好选择吸附性能的钙基膨润土作为吸附剂对3号水样（水渠水：盐度为11 352mg/L）进行除盐。在固定温度50℃、搅拌速度为0.75m/s、吸附剂用量为5g（每100mL水样）,搅拌1h后静置1d,总盐量降幅为23%,Na＋浓度降幅为32%。此实验结果对高盐农业废水的再利用具有重要参考价值。

[Objective] The paper aimed at researching on the ecological remediation materials and related technologies in degraded land.[Method] Pointing at the specific reasons for degradation of soil moisture and fertility conditions,the ecological remediation materials and related technologies for soil moisture had been studied using layered silicates as substrate materials and using straw turnover as the method.The application research had been carried out in degraded cultivated land,compacted land,saline-alkali soil and laboratory of nine provinces and regions on 26 species and 48 varieties.[Result] The materials and related technologies are environment-friendly in formula,processing,application with no hidden trouble as secondary pollution,which can be used for the restoration of positive balance of soil moisture conditions（water,fertilizer,gas,and heat）,establishment of the core of a stable circle and improving food production steadily.The materials are more suitable for plant growth than chemical fertilizers,applying of which helps plants obtain better adversity resistance.[Conclusion] The ecological remediation materials for soil moisture can reduce the application of chemical fertilizers effectively and improve the production and quality of crops remarkably.

This article brifely introduce the foundation theories of coal tar pitch and the method of the coal tar pitch's modification,carried on the dissertation take two kinds of modifying asphalt as representative to their two kind of asphalt's modification,summarized the modifying asphalt merit and the insufficiency in the development,and summarize modifying asphalt's technical development history all with domestic and international research actuality.

This paper briefly introduced the research advance in oxidation and chlorination modification for paraffin at home and abroad,and reviewed the application situation of paraffin modification technology.Furthermore, it prospected the development of paraffin industry,which provided reference for application and research of Chinas paraffin industry.