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欲了解一个地区的盐渍、风沙、积涝土壤的变化,必须研究该地区这些土壤在不同时期的分布状况。要查清这些土壤的分布现状,只要利用最新的航空像片进行土壤遥感制图即可做到。但要了解它们自某个历史时期以来的变化情况,由于时过境迁,则不很容易。而航空像片不仅详细、真实地记录了不同时期的土壤分布状况,而且还记录了它们在不同时期所处的环境条件,如排灌、植被、利用方式等状况。借助不同时期的航空像片来比较、分析各种土壤的分布状况及有关环境条件的变化,可以研究某些土壤的变化和引起其变化的原因。在天然文岩渠流域盐渍、风沙、积涝土壤历史变化的研究中,我们以1957和1983年的航空像片为主要资料,完成了所述的研究任务。
To understand the changes of salinities, sandstorms and floods in a region, the distribution of these soils in different parts of the region at different times must be studied. To find out the status of the distribution of these soils, so long as the use of the latest aerial photographs of soil remote sensing mapping can be done. However, it is not easy to understand the changes that have taken place since a certain historical period as a result of the passage of time. The aerial photographs not only detailedly and truly recorded the distribution of soil in different periods, but also recorded their environmental conditions in different periods, such as irrigation and drainage, vegetation and utilization patterns. With the comparison of aerial photos from different periods and analysis of the distribution of various soils and the changes of relevant environmental conditions, we can study the changes of some soils and the causes of their changes. In the study of the history of salinization, wind-blown and flood-logged soil in the natural Wenyan drainage basin, we completed the research tasks with the aerial photographs of 1957 and 1983 as the main data.