洞庭湖平原地势平坦,境内河湖纵横,农田地下水位高。特别是每年5—8月的汛期,河、湖洪水水位常常高于烷内稻田高度,土壤渍水严重。这种状况既成为水稻生长的障碍因素,又反映湖区土壤水分运行具有与其他地区明显不同的特点,极大地影响着湖区土壤的发育和养分的移动。 为了研究湖 Dongting Lake plain is flat, the territory of rivers and lakes, farmland water table is high. Especially in the flood season from May to August every year, flood levels of rivers and lakes are often higher than those of paddy fields in the area of ​​alkanes, and soil waterlogging is serious. This situation not only becomes an obstacle to the growth of rice, but also reflects that the operation of soil water in the lake area is obviously different from other areas and greatly affects the soil development and nutrient movement in the lake. In order to study the lake