alkali lands中文什么意思
碱地
例句与用法
更多例句： 上一页 - 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。 - We summarize our results as follow : during the period of 1981 - 2000 , there was a great change of land use in the county . the area of arable land , forest and saline - alkali land increased ; water land and resident land changed a little ; the area of the grassland and wasteland decreased greatly
结果显示：在1981 2000年这二十年间，长岭县的土地利用变化总的趋势是：耕地、林地和盐碱地面积增加，水域、居工用地变化不大，未利用地部分已被利用，草地面积急剧减少，并伴随着日益加剧的沙化和盐碱化。
