| 摘要: |
| 通过对研究区1954～1975年四次黑白航片的解译及实地调查,发现该地区自50年代以来,大面积的盐土逐渐地脱盐而成为盐化土壤;盐土南部分布界限不断往北后退。通过对比解译的50年代的地下水位分布图及1980年实地调查的地下水位分布图后认为,地下水位的不断下降是土壤不断脱盐和盐土界限不断后退的直接原因。地下水位的下降是由来水量的减少、排水能力的增强以及复种指数的提高等条件的变化综合作用的结果。 |
| 关键词: 盐渍土 变化规律 变化原因 |
| DOI： |
| 投稿时间：1992-04-26 |
| 基金项目: |
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| Change Regulations of Salt-affected Soils in Shouguang County Since 1950's and Reason Analysis |
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| Abstract: |
| 4 year's salt-affected soil maps(1954,1961,1967 and 1975)were made from interpretation of 4 year's black and white photos of the research area.The comparisons of 4 year's salt-affected soil maps showed that solonchaks were desalinised and the salinities of salt-affected soils decreased,and the joint belt of non-salt-affected soils and salt-affected soils retreated from the south to north of the low coastal plain.By comparison of two groundwater table maps of 1954 and 1980,we could get the result,the drop of... |
| Key words: salt-affected soils desalinization groundwater table cropping systems |
