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对浙江省衢州市和丽水市2个水改旱系列共8个土壤剖面理化性质的鉴定表明,水耕人为土返旱后土壤人为滞水水分状况消失,逐渐向潮湿或湿润水分状况转变;在水耕条件下形成的水耕表层(相当于耕作层与犁底层)和水耕氧化还原层(相当于渗育层和潴育层)的氧化还原特征也发生了相应的变化。返旱后,土壤全铁和游离氧化铁含量变化不大,但氧化铁的活性下降,土体坚实度增加,土色变浅,土壤趋向酸化,并促使犁底层以下土层中大柱状结构和大块状结构的形成。返旱后,土壤诊断特性也发生了较大的变化。由于水分条件的改变和水耕表层与水耕氧化还原层性质的变化,水改旱后土壤已不能满足水耕人为土诊断要求,也不同于相同母质发育并一直旱作(没有种植水稻的历史)的母土,成为新的土壤类型。
The identification of physical and chemical properties of 8 soil profiles of two water diversion and drought series in Quzhou City and Lishui City of Zhejiang Province showed that the artificial stagnant water of the hydroponic artificial soil disappeared and gradually changed to wet or moist water condition after return to drought; The redox characteristics of hydroponic surface layer (equivalent to plow layer and plow bottom layer) and hydropodic redox layer (corresponding to infiltration layer and retention layer) formed under hydroponic conditions also changed correspondingly. After returning to the drought, the contents of total iron and free iron oxide in soil changed little, but the activity of iron oxide decreased, the soil solidity increased, soil color became lighter, the soil tended to be acidified, and the large columnar structure and Formation of massive structures. After returning to the drought, the soil diagnostic features have undergone major changes. Due to the change of moisture condition and the change of properties of hydroponic surface layer and hydropodic redox layer, the soil after water-drought transformation can no longer meet the diagnostic requirements of hydroponic artificial soil, and also different from the same parent material and has been drought-dried (no history of planting rice ) Of the native soil, a new type of soil.