计算；总结 meaning in English

sum up

Beginning with the analyse of present situation and cause of formation of saline - alkali land , the irrigated area overall water salt trends are analysed , and the irrigated area saline - alkali land and the groundwater level and distribution law of groundwater degree of mineralization are expounded , the trendence of irrigated area saline - alkali land is put forward . then water salt balance model is estanbished according to the relationship of irrigating and drainage . regarding the irrigated area as a balance area , by analysis of mineralization degree of water pumping from the yellow river and drained off water from irrigated area , the change of the draining off water ion is forcasted in water reducing condition
课题研究主要从盐碱地现状与成因及灌区总体水盐动态分析两方面入手，阐述了灌区盐碱地、地下水位、地下水矿化度的分布规律，分析了灌区盐碱地的成因及变化趋势；根据灌区灌溉、排水条件与以上各种因素的关系，建立了灌区水盐均衡模型；把灌区作为一个均衡区，通过对黄河来水矿化度、灌区排水矿化度的分析，预测了在灌溉引水、排水减少时排水离子量的变化；运用灌区水盐动态模型原理，对灌区现状( 1998 、 2000年)与规划水平年总体水盐平衡进行了计算；总结分析了灌区水盐动态变化趋势，计算并提出了排水控制标准。