城市污泥的土地利用对黑麦草理化指标和品质的影响

通过室内盆钵试验研究了施用城市污泥对黑麦草理化指标和品质的影响,旨在为污泥的土地利用提供科学依据。研究结果表明,随着污泥施用量的增加,黑麦草的叶绿素a、叶绿素b含量呈现波动变化,在25~30 g.kg-1达到极大值;黑麦草中硝酸还原酶、可溶性糖、可溶性蛋白和抗坏血酸的含量呈现先急剧增加然后逐渐减少的趋势;SOD、MDA、粗纤维和硝酸盐含量呈现先随污泥含量增大降低,然后又升高的趋势。说明施加适量的污泥可促进黑麦草的生长,有利于黑麦草品质的提高,但施加过量的污泥既抑制黑麦草的生长也不利于品质的提高。对上述指标中污泥的最佳施用量范围进行综合分析,可以得出污泥的最佳施用量为20~35 g.kg-1。

Influence of Municipal Sludge Land Application to Ryegrass Physical and Chemical Properties and Quality

The paper studied influence of municipal sewage sludge on the physical and chemical properties and quality of ryegrass through indoor pots, for the sludge land use to provide a scientific basis. The results shows that with the increase of sludge application, chlorophyll a, b content of ryegrass changes show fluctuations in the 25～30 g·kg~(-1) to achieve maximum value;nitrate reductase, soluble sugar , soluble protein and ascorbic acid content of ryegrass at first increase and then gradually reduce in the trend; SOD, MDA, crude fiber and nitrate content of ryegrass at first is in lower with the increase of sludge, and then increasing trend. The result shows appropriate amount of sludge can promote the growth of ryegrass and it is conducive to the improvement of the quality of ryegrass; however an excessive amount of sludge inhibit the growth of ryegrass is not conducive to quality improvement. Through a comprehensive analysis about the best sludge application, the sludge can be drawn from this study the best use of the range of 20～35 g·kg~(-1).