土壤化学性质对Cu的植物吸收效应和土壤有效Cu测定的影响

在华北平原石灰性土壤中,盆栽小麦的生物相关性检验证明,常用的SB/D联合浸提剂或AB/D联合浸提剂,与植物的吸Cu量均无显著相关关系,不适合直接用来测定土壤有效Cu.校正土壤pH和有机质含量之后,SB/D侵提剂与吸Cu总量的相关性则达到P＜0.01的极显著水平,可用于土壤有效Cu的评价.土壤pH越高则小麦吸收的Cu越少；土壤pH升高1个单位,则土壤有效Cu吸收量平均减少19μg·盆^-1.土壤pH升高和有机质含量增加,土壤有效Cu的测定结果分别减小和增大.

Impact of soil chemical properties on Cu uptake by plant and on soil available Cu testing

Apot experiment with winter wheat (Triticum aestivum) and calcareous soils collected fromNorthern China Plain shows that there is no significant correlation between SB/Dor AB/Dextracted Cu and Cu uptake by wheat plant, indicating that these two extractants are unsuitablefor testing soil available Cu. But SB/D-extrated Cu is correlated with Cu uptake at level P<0.01 and can be used to evaluate soil available Cu, when soil pHvalue and orgnic matter content are calibrated. The higher the soil pHvalue, the less the Cu uptake by wheat. The averagc soil available Cu is decreased 19μg per pot, when pHvalue is increased one unit. When thesoil pHvalue and the soil organic matter content are increased, the content of soil available Cu isdecreased and increased respectively.