石灰性紫色土渍水氧化还原状况的研究

本文通过模拟培育试验，研究了石灰性紫色土渍水状态下氧化还特征。结果表明，石灰性紫色土与普通紫色土，不饱和紫色土相比，不易向强还原状况发育，这些其富含碳酸钙和低量的活性铁有关；不同种类有机物料对其还原程度的影响是不同的；表征土壤氧化还原过程的强度因素Ｅｈ和数量因素还原性物质含理有很好的相关性，并与水稻的生长状况相一致，当土壤Ｅｈ小于－１００ｍＶ，还原物总量大于３．６３ｃｍｏｌ＾（＋）／ｋｇ时，土壤极

STUDY ON REDOXIC PEATURES OF CLACAREOUSPURPLE SOILS AFTER WATERLOGGING

The present paper deals with a study on redoxic features of calcareous purple soils after waterlogging through a simulated incubation test. The results show that (1)as compared with haplie purple soils and dystric purple soils, calcareous purple soils were difficult to develop strong reduction status, which was related to the contents of CaCO₃ and active iron of soils (2) the different organic substances had different influences on soil reduction intensity and (3) the intensity factor (redox potential) was highly correlated with the amount factor (content of reducing materials) and was consistent with the growth status of rice. When Eh<-100mV and the total amount of reducing substances>3.63cmol/kg, soils were easy to develop strong reduction ststus, which would poison the rice growine.