作　　者： ; ; ; ;

机构地区： 宁夏农学院

出　　处： 《草业学报》 1998年第2期34-42,共9页

摘　　要： 以系统仿真的方法对甘肃河西内陆盐渍化草地植物—环境系统进行了模拟。模型的系统变量包括：土壤表土层水、盐含量；地面植被覆盖度和叶面积指数；灌水、地下水位埋深；以及土壤有机质含量、气温等。模拟过程包括：土壤表土层水、盐含量的季节变化；土壤不同层深水、盐运动；以及土壤水、盐含量对植物萌发和生长的影响。模拟结果表明：（１）本系统模型能反映调查地土壤的水、盐季节变化及在不同层次的扩散动态；（２）灌水能降低表土层含盐量；（３）地上植物生物量的增加能有效地降低地表层盐分含量。  system simulation model was constructed and implemented to simulate the dynamic interaction of the plant and soil variables, such as water content and salt concentration in the saline grassland of Hexi Corridor in the northwestern China. The system variables in the model included: soil water and salt contents in the top soil; plant coverage and leaf area index; irrigation; soil organic content; air temperature and so on. The process considered in the model included seasonal variation of water content in the top soil; the movement of water and salts in the variant soil horizons; and variation of germination power and plant growth rate in various water and salt contents in variant soil horizons. The results of simulating the movement of water and salts over 8 month period indicate that: (1) This model can be used to simulate the movement of water and salts in the soil; (2) The salt content in top soil can be reduced by irrigation; (3) Plant coverage can effectively reduce the salt content in the top soil.

关 键 词： 河西 系统仿真 数值模拟 盐渍化草地 草地 环境

领　　域： [生物学]