论文部分内容阅读
在 [Ca(NO3) 2 ]盐处理土壤中 ,研究了两种湿度水平 (2 0 0、40 0g·kg-1)和湿 干循环对土壤Mn释放的影响 .结果表明 ,土壤水分状况影响土壤Mn的有效性 ,湿度大时 ,易还原态Mn转化为水溶态、交换态Mn ;盐分对易还原态Mn的转化有一定影响 ,NO-3 能缓冲土壤Eh的下降 ,有抑制易还原态Mn转化的作用 .连续的湿 干循环能使土壤 2价Mn(水溶态Mn、交换态Mn)浓度降低 ,而Ca(NO3) 2 盐能增加Mn的不溶性 .这在Mn含量低的土壤上 ,最终将导致Mn的缺乏 .
The effects of two moisture levels (200 and 40 g · kg-1) and wet-dry cycles on soil Mn release were studied in [Ca (NO3) 2] -treated soil, and the results showed that soil moisture affected soil Mn. When the humidity is high, the easily-reducible Mn is transformed into the water-soluble and exchangeable Mn. The salt has certain influence on the conversion of easily reducible Mn. NO-3 can reduce the decline of soil Eh and inhibit the easy reduction of Mn The effect of continuous wet-dry cycle on the divalent Mn (water-soluble Mn, exchangeable Mn) in the soil was reduced, while that of Ca (NO3) 2 increased the insolubility of Mn, Will lead to the lack of Mn.