四湖地区处于江汉平原的南缘,是夹在长江与汉江之间的平原湖区,属中生代以来大幅度下降的沉降带。地势低洼,地下水位高,耕层常年积水,成土母质多为近代河流冲积物和湖相沉积物,土壤的粘粒含量一般较高,垦殖以前的自然植被主要是芦苇、蒿草和各种水草,垦殖后主要种植水稻。由于地下水位高,土体长期渍水,这些植被死亡以后,矿质化作用微弱,土壤有机质积累较多。由 The Four Lakes Region is located in the southern margin of the Jianghan Plain and is a plain lake zone sandwiched between the Yangtze River and the Han River. It is a subsidence belt that has dropped significantly since the Mesozoic. Low lying, high groundwater table, perennial ponding water, soil parent material mostly modern river alluvial and lacustrine sediments, soil clay content is generally high, the natural vegetation before reed, grass and grass Plant species of water, cultivate the main planting rice. Due to the high groundwater level and long-term soil waterlogging, after the death of these vegetation, the mineralization is weak and soil organic matter accumulates more. by