冻融作用对石油污染土壤微生物修复的影响

结合近年来中国和其他国家有关石油污染土壤微生物修复研究的进展,阐述了石油污染土壤微生物修复的原理、现状及影响因素,并指出了目前石油污染土壤微生物修复过程中存在的主要问题。初步探讨了冻融作用在石油污染土壤微生物修复过程中,对土壤微生物、环境因子的影响,以期为微生物修复技术在中国东北地区石油污染土壤中的实际应用提供理论依据。     

Relationships between surface albedo,soil thermal parameters and soil moisture in the semi-arid area of Tongyu,northeastern China

Continuous observation data collected over the whole year of 2004 on a cropland surtace m Tongyu, a senti-arid area of northeastern China （44°25＇N, 122°52＇E）, have been used to investigate the variations of surface albedo and soil thermal parameters, including heat capacity, thermal conductivity and thermal diffusivity, and their relationships to soil moisture. The diurnal variation of surface albedo appears as a U shape curve on sunny days. Surface albedo decreases with the increase of solar elevation angle, and it tends to be a constant when solar elevation angle is larger than 40°. So the daily average surface albedo was computed using the data when solar elevation angle is larger than 40° Mean daily surface albedo is found to decrease with the increase of soil moisture, showing an exponential dependence on soil moisture. The variations of soil heat capacity are small during Julian days 90 300. Compared with the heat capacity, soil thermal conductivity has very gentle variations during this period, but the soil thermal diffusivity has wide variations during the same period. The soil thermal conductivity is found to increase as a power function of soil moisture. The soil thermal diffusivity increases firstly and then decreases with the increase of soil moisture.     

沿海缺水灌区地表水地下水联合调配管理信息系统

根据沿海地区实际情况,集成以往的研究成果及相关数据,建立沿海缺水灌区地表水地下水联合调配管理信息系统.该系统具有友好的界面,是地理信息系统、数据库技术以及水资源系统模拟优化等多技术综合集成的动态管理系统.模型具有一定的通用性,可为沿海缺水灌区地表水地下水规划管理服务,也可为各级水管部门准确及时提供水资源信息.