有机污泥与水处理残渣混施对冬小麦根系特征的影响

虽然水处理残渣与有机污泥混施可以减少土壤P过量积累以及P对地表和地下水的污染.但随着水处理残渣施用量增大,又有可能导致土壤P不足或对植物的铝毒作用.本研究通过对植物根系形态特征的分析,对温室控制环境下有机污泥与水处理残渣合施对冬小麦(Triticum aestivium L.)生长的影响作用进行了研究.实验设6种处理,生物污泥(g.kg-1干土)与水处理残渣(g.kg-1干土)之比分别为0∶0;0∶80;50∶0;50∶10;50∶40和50∶80.结果表明,与不施用有机污泥相比,施用有机污泥后冬小麦根系长度、根系表面积、根体积和根长密度均显著增加,分别平均增加139.4%,140.1%,157.6%和139.4%.在现有施用量范围内,水处理残渣使用量加大没用对各种根系参数(即根长、根表面积、根平均直径、根体积、根长密度和比根长)产生不利作用.证明水处理残渣与有机污泥混施,即可降低对环境质量的不利影响,在农业生产上具有良好应用前景.

Root Characteristics of Winter Wheat as Affected by Co-application of Biosolids and Water Treatment Residuals

Co-application of water treatment residuals (WTR) with biosolids can reduce the buildup of P in soil as well as the risk of P losses to surface and ground water.However,co-application of WTR and biosolids may result in P deficiency in soil and plant AI toxicity with increasing WTR rate. In this study,their co-application effects on the growth of winter wheat (Triticum aestivium L. ) were studied in terms of morphological characteristics of plant roots in a greenhouse experiment. Treatments included WTR alone (0, 80 g · kg-1 soil) and combinations of biosolids at 50 g · kg-1 soil with WTR at 0,10,40,and 80 g · kg-1 soil,respectively. Biosolids addition increased root length (RL),root surface area (RSA).root volume (RV) and root length density (RLD) by 139. 4 %,140. 1 % ,157. 6 % and 139. 4 % (respectively. Increasing WTR application rate did not resuft in adverse effects on all root parameters [RL,RSA,RD (root average diameter),RV,RLD and SRL (specific root length)] within its current application range. This indicated co-application of WTR with biosoilds can be a promising practice for agricultural production when reducing adverse impacts on environmental quality.