十六世纪以来皇甫川流域的水沙变化复原

本文通过对皇甫川流域一组树木年轮资料的分析,重建了皇甫川流域自十六世纪以来的降水变化过程;在此基础上,根据皇甫川流域的现代水沙变化的相关关系,进一步反推出近500年来皇甫川入黄泥沙的变化过程。

THE RESTORATION OF THE CHANGING PROCESS OF PRECIPITATION AND SEDIMENT OF HUANG PUCHUAN BASIN AFTER THE 16TH CENTURY

This paper presents us the restoration of the changing process of precipitation and sediment of Huang Puchuan Basin after the 16th century by analysis a series data on the tree ring. On this basis, the author puts forward the changing process of the sediment which have been flowing into the Yellow River from Huang Puchuan Basin for about 500 years by means of the study on the relative relations between the precipitation and current sediment. The main results are as follows: (1) The data on the tree ring is an effective means to restore the change process of precipitation in historical time. (2) It is easy for us to use the tree-ring data to study soil erosion in some regions with farming and animal husbandry crisscrossed indirectly. (3) The change relation between sediment yield (Y) and precipitation (X) is a kind of index relation: Y=489.63EXP(0.00573x) (4) The frequency of precipitation fluctution is getting faster and faster while climatic diasters such as droughts and floods will increase. (5) Though the change tendency of sediment flowing into the Yellow River (from Huang Puchuan) is mainly controlled by the condition of precipitaton,humankind, to a certain extent, it can make conscious effects to decrease the amount of sediment yield flowing into the Yellow River.