宋元时期吴淞江流域的稻作生态与水稻土形成

The Rice Ecology and the Paddy Soil Formation in Wusong River Valley in Song and Yuan Dynasty

北宋初期,吴淞江流域仍有许多圩田内存在着大量的休耕地与不得耕种的积水田,水稻土的脱潜与剖面发育较慢。到了后期,吴淞江流域的水环境和农作技术都在推动着水稻土剖面的完全形成。宋初的丰水环境出现了变化,吴淞江的淤塞使这一地区的旱田化作用增加,脱潜化程度加强。与此同时,农作技术的发展,特别是搁稻、施肥、翻青和开沟技术,都促进了水稻土的良性发展。

At the beginning of North Song dynasty,there were a lot of fallow lands and lands covered with water in Wei fields in Wusong River valley.Both the development of profile of paddy soil and the process of getting out of gleization was very slowly.In the later stage,the water condition and the agricultural technology promoted the formation of the profile of paddy soil.The water abundant condition at the beginning of North Song dynasty had been changing,the silting of Wusong River made more and more dry land,and the process of getting out of gleization also was intensified.In mean time,the development of agricultural techniques,such as drying land of rice field,applying fertilizer,retracting green grass and ditching technology,all had promoted the good profiles of paddy soil.