%0 Dataset %T Geology and geomorphology of the continental shelf and continental slope %J Arid Land Ecology and Resources Science Data Center %I Arid Land Ecology and Resources Science Data Center(data.dcxjegi.cn) %U https://data.dcxjegi.cn/portal/metadata/69fc700b-d36a-431a-82f1-f266c5ccc25d %W NCDC %R 10.12389/ariddc.01978 %A Documentation Information Center %K ; %X The published works of the Aral Caspian Sea comprehensive investigation team are devoted to analyzing the soil improvement conditions of the lower reaches of the Amu Darya River, one of the oldest irrigation oases in Central Asia, which is the ancient cradle of Central Asian culture. The vast plains of the region are currently only partially used for irrigation. It is entirely possible to double or triple the existing irrigation area, so as to revive the largest irrigation area in ancient khwarazmo, which was damaged by the invasion of Genghis Khan. For many years, research has been carried out in this area to develop a detailed irrigation scheme.The author of this book, together with VA akovda, a communication academician of the Soviet Academy of Sciences, has led the activities of the Aral Caspian Sea comprehensive investigation team for many years, including the study of soil improvement in the lower reaches of the Amu Darya River. The main problem raised by the author is to analyze the law of salt mass migration in soil, soil layer and groundwater in the ancient delta of Amu Darya River under the influence of natural process and long-term irrigation. In this field, the Soviet Union's soil improvement science revealed many very important and profound processes, which explained the causes of secondary salinization of newly irrigated and formerly fertile land, and formulated the main ways to eliminate these phenomena. However, the migration process of salt quality in the irrigated oasis depends on so many factors that for each new irrigation object, it is necessary to study the characteristics of the local natural environment, and on this basis, select the most favorable and reliable design scheme for regulating the water and salt status of the irrigated land. We have to do the same when we formulate a plan to eliminate the salinization and swamping of the existing irrigated oasis soil.In the lower reaches of the Amu Darya River, the migration law of salt quality i