不同地下水位稻作制和施肥条件下土壤还原物生成量的研究

1982～1986年人工模拟池的试验结果表明,各还原物生成量随有机物施用量增加。随地下水位升高而增加,但并不随有机肥施用的增加而按比例呈直线上升,同时随着时间的延伸,地下水位的影响逐渐减弱。另外,各还原物生成量不同稻作制表现差异很大,其顺序为冬泡>冬绿>冬油,冬泡与冬种比较,还原物生成量差异显著,但冬绿与冬油差异不明显。

EFFECTS OF DIFFERENT WATER TABTES, CROPPING SYSTEMS AND APPLICATION OF ORGANIC MANURE ON FORMATION RATES OF SOIL REDUCTIVE SUBSTANCES

The experiment was conducted from 1982 to 1986. The formatiom rates of soil reductive substances increased with the increases of organic manure application and the height of water tables but there Was no linear relationship between soil reductive substance and organic manure application. The effect of water table decreased with the increase of treatment time.There were also great differences in the formation rates of soil reductive substances among three rice based cropping systems, which were in order of decreasing rate of reductive substances were winter flooding, winter green manure and winter rape. Between the former and the other two there was significant difference but the difference between the latter two was insignificant.