盐碱化

• Qualitative analysis on the effect of flood control and engineering safety - , seizing lots of water conservancy effective adjust storage . then making water level risen and reservoir backwater enlarged in the same flow level ? effect on beach and the buildings across river , soil salinization caused by flow from a lower to a higher place and unsmooth groundwater drainage destroy of travel resource caused by disorder enclose tideland for cultivation in reservoir silt up flood plain are given , then presents enclose tideland for cultivation dyke is important cause which water level rise in reservoir
  本文从青铜峡水库泥沙淤积入手，分析水库泥沙淤积特性和库区围垦堤开发利用淤积滩地的现状，对防洪安全及工程安全的影响、侵占大量的有效调蓄库容、造成同级流量下水库水位抬升水库回水上延、对沿岸及过河建筑构成影响、因水位抬升致使库区周边灌区地下水排水不畅乃至倒灌而造成土地盐碱化、对水库库区大量淤积滩地无序围垦造成旅游资源破坏等五方面影响的定性分析，提出库区围垦堤是水库水位抬升的重要原因。
• Because of obstructing by impermeable wall , groundwater drainaged long time brings about immersion , whether or not this will result in a series of water surroundings problems , such as farmland salinization , marsh , lowering of ground temperature and so on , which are all focused on by government , resident , experts in engineering , hydrogeology , agriculture and surroundings
  而是否会因为防渗墙的阻隔，地下水长时间得不到排泄而产生浸没，造成农田盐碱化、沼泽化和地温降低等一系列水环境问题，均系堤防建设区各级政府、沿江居民和国内外部分工程及水文地质专家、农业与环境保护专家共同关心的话题。
• ( 5 ) the maximum water level risen by the enclose tideland cultivation around the reservoir is 0 . 66m , the responding quality is 2000mvs , which heavily effect the environment around the reservoir . the reservoir " s water level is risen because cross section and flood canal become narrow , which caused by building dam , this makes groundwater unsmooth , drainage , even flow from a lower to a higher space and soil salinized
  66m ，且为2000m ’儿的常年洪水，对库区周边环境的影响较大，因打坝筑堤缩小过水断面和行洪通道造成水库水位进一步抬升，致使库区周边灌区地下水排水不畅，乃至倒灌，型成士地盐碱化。
• The ground water of shallow layer which is replenished year by year by the water from yellow river is abundance . it have following feature : quick replenishment , good water quality , shallow embedding , fitting temperature of water , etc . but the grain in the aquifer is so fine that it is difficult to take the water from well and the well is easy to be blocked . furthermore , there exist salt water and buck water in local region
  区内浅层地下水由于黄河水的常年补给，水量充沛，且具有埋藏浅，补给快，水质好，水温适宜等特点，但因其含水层颗粒细，成井取水困难，井易淤、易堵：局部地区有咸、碱水存在，严重阻碍了浅层地下水的开发利用，导致区内农灌用水主要是引黄，致使地下水位升高，次生盐碱化加重，泥沙淤积、湖泊萎缩，湿地沼泽扩大，旱涝盐碱等自然灾害频繁发生。
• Through the analysis on the discrepancy between the indexes of land use and landscape structure of both the periods , the change of the eco - environment caused by the causations of both the nature and the human activities is pointed out that the total area of the studying region is somewhat reduced ; the alkali - saline land therein is utilized for fishery breeding ; a part of the unused land and water area are basified ; the sorts of landscape are rich and uniform and serious fragmentations are locally occurred
  通过分析两期土地利用及景观结构指数之间的差异性，指出由自然和人为原因引起的生态环境的变化：研究区总面积有所减少，盐碱地改良后用于了鱼虾养殖，部分未利用地和水域盐碱化，区域景观类型丰富且均匀，局部破碎严重。
• 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。
• Adopt the mean of analyzing the factors which influence the output of the crops to quantity and determine the factors , assess the correlation among the grading factors in the units and calculate the point value of these factors ; determine the weigh value of the factors . ten factors , which are content of organic matter , thickness of soil layer , quality of soil , pickled degree of land , condition of irrigation and state of shelter belt , the degree of land " s leveling , central focus region ( focus region location ) , utilization method of soil , are chosen as grading index at last
  本文采用因素法定量化评价各地块定级单元的相关性和权重性，最终选定了有机质含量、土层厚度、土壤质地、盐碱化程度、排水能力、灌溉保证率、防护林完整度、条田平整度、中心区位，土地利用方式等因子作为定级的指标，使用了加权加和因素法进行了的定级计算，逐步完成了农用地质量情况的评价，划分出了级别。
• Qingtongxia irrigated area , located in the hetao area of ningxia hui autonomous region , has had more than 2000 years pumping water from yellow river irrigating because there is an arid region , evaporating strongly , the groundwater depth of burial being shallow , especially in yinbei region , the perpendicular motion of groundwater being fairly acute , and the salt content of groundwater being detained in soil , which caused the soil salinization
  青铜峡灌区位于宁夏黄河河套地区，已有两千多年的引黄灌溉历史，由于灌区地处温带干旱地区，蒸发强烈，地下水埋深浅，特别是银北段，地下水的垂直运动比较剧烈，地下水的盐分滞留于土壤中，造成土壤盐碱化。