三峡工程对洪湖地区地下水动态和土壤潜育的影响

土壤潜育化沼泽化对于长江水位变化的响应是通过地下水位变化间接实现的，因而直接研究三峡工程对土壤潜育化的影响比较困难。首先通过建立长江与地下水位之间的定量关系模型，阐述了长江月均水位每上升或下降0．5m、1m、1．5m、2m所导致的地下水月均水位的变化。引用地下水位相对变幅，建立其与距离的线性关系，计算得长江对研究区域地下水有明显影响的距离为21kin，影响最远可达27kin。然后通过土柱模拟实验研究了洪湖地区地下水位与土壤潜育化指标的关系，结果表明地下水位变化对各土层的潜育化指标均有显著影响。最后，结合遥感影像，描述了三峡水库蓄水后土壤潜沼化的演变及趋势，为该地区农业生产发展提供了有意义的借鉴。图3，表3，参12。

The Effect of Three Gorges Project on Groundwater Level and Soil Gleizafionm HonghuRegion

Responses of the change of Yangtze River to soil gleization and swampiness is come out by the dynamics of ground water. But it is dif-ficuh to study the effect of Three Gorges Project on soil gleizafion and swampiness directly.This paper builds a model between Yangtze River month average level and groundwater month average level. This model reflects the month average level change of groundwater while Yangtze River's month average level changes of 0.5m, 1m, 1.5m, and 2m.lt farther studied the correlativity between the Yangtze River water andmground water,and calculated that the distance of marked infection by the Yangtze River to ground water of research area is 21kin,and the far-thest distance is 27km. Then the report studies the effect of ground water upon soil gleization and swampiness in Honghu region by Soil column simulation experiments. As a result, the effect of the change of groundwater level on soil gleization indices is obvious. In addition, this paper de-scribes the evolvement of soft ghization and swampiness in Honghu region after impoundment of Three Gorges reservoir by remote sensing im-ages. And it provides a useful reference for the production and development of agriculture in this area.