摘要
以耕型第四纪红壤为供试土样,淹水种稻,进行水田耕作制模拟试验、室内培养试验和恒温吸附试验,研究了旱改水以及不同稻作制对土壤磷的吸持作用的影响,并探讨了旱改水以及不同稻作制条件下土壤对磷的吸持作用变化的原因。
A study was conducted on the effect of flooding of arable red soil and various rice-based cropping systems on phosphate retention by soil. Phos-phate retention by red soil increased significantly after flooding. The treatment of early rice-late rice-winter flooding had much more significant effect on the increase in phosphate retention by soil than the treatments of early rice-late rice-winter manure and of early rice-late rice-winter rape. The change in pho-sphate retention by soil was consistent with the change in amorphous Fe oxide content of soils in various cropping system treatments. Removal of free Fe oxi-de and amorphous Fe oxide decreased significantly phospate retention by soil in all treatments.
关键词
水稻土
耕作制度
有机质
磷素
paddy soil
farming system
ground water level
soil organic matter
soil phosphorus/phosphate retention by soil
