油菜花果期以持续受渍为特征的排水控制指标试验研究

为了探索易涝易渍地区作物排水管理 ,以地下水动态指标 SEW3 0 反映作物的受渍程度 ,利用测坑和小区试验研究了油菜花果期持续受渍对产量和含油量的影响。研究表明 ,持续受渍对产量的影响远比含油量大 ,因此 ,宜以产量作为油菜排水控制指标的选择依据。统计分析表明 ,持续受渍程度 SEW3 0 与作物相对产量 Ry 之间有极显著的线性负相关关系。以 SEW3 0 作为评价作物持续受渍的指标 ,以作物减产 10 %～ 15 %作为选择排水指标的尺度 ,油菜花果持续受渍下的排水控制指标宜取 80～ 12 0 cm· d。

An Experimental Study on Suitable Drainage Indexes in Blooming-fruiting Stage in Rape under Continuous Subsurface Waterlogging

An index (SEW 30 ) of groundwater dynamic state was used to represent crop degree of suffering subsurface waterlogging and an experiment was carried out under pot cultivation and small field plots cultivation to study the influences of continuous subsurface waterlogging in blooming-fruiting stage of rape uponyield and oil content. Results showed that influence of continuous subsurface waterlogging upon yield was far more remarkable than that upon seed oil content. So that, yield may be as a suitable standard for determining drainage index. Statistic analysis results showed that there was a very significant relationship between relative yield, R y, and SEW 30 , and 10%～15% of yield reduction was a suitable standard for determination of crop drainage index. Correspondingly, dominated index of SEW 30 for drainage should be as 80~120 cm·d in blooming-fruiting stage of rape.