纳米碳溶胶对碱性土壤pH和养分含量的影响

采用土柱淋洗试验和土盆试验,研究了浓度分别为10、20和40 mg/L的纳米碳溶胶对碱性土壤p H、EC值和速效养分含量的影响。结果表明:纳米碳溶胶能够明显降低碱性土壤p H和EC值,最大降低幅度分别达到0.49个单位和0.14 m S/cm,且纳米碳溶胶浓度越高,降低效果越明显。纳米碳溶胶能够明显增加0~80 cm各土层硝态氮含量,3个处理平均增幅分别达到21.99%、27.34%和25.57%;但对铵态氮含量影响较小。纳米碳溶胶淋洗可提高各土层中有效磷含量,但不同浓度纳米碳溶胶在不同土层中表现效果不同,3个处理有效磷含量平均增加10.10%、13.72%和12.30%。纳米碳溶胶对土壤钾素有较好的活化效果,各土层速效钾含量均有明显增加,3个处理平均增幅分别达到6.62%、12.54%和13.18%。上述结果表明纳米碳溶胶能够明显降低碱性土壤pH和EC值,提高速效养分含量,对碱性土壤有较好的改良效果。

Effects of Nano Carbon Sols (NCS) on pH and Nutrient Contents of Alkaline Soil

Soil column leaching experiment and soil pot experiment were conducted in this study in order to clarify the effects of nano carbon sols (NCS) on pH, EC and nutrient contents of alkaline soil. The results showed that NCS obviously reduced soil pH and EC values, the maximal reduced value were 0.49 units for pH and 0.14 mS/cm for EC, respectively, and the reducing effect was more obvious under higher NCS concentration. NCS significantly increased nitrate contents in 0-80 cm soil, averagely increased by 21.99%, 27.34% and 25.57% under different treatments, respectively, but it influenced little on ammonium nitrogen content. NCS increased available phosphorus contents in different soil layers, averagely increased by 10.10%, 13.72% and 12.30% respectively under different treatments, but the effects were different in different soil layers. NCS had higher activation effect on soil potassium, could increase soil available potassiecm contents significantly, averagely increased by 6.62%, 12.54% and 13.18% under different treatments. Therefore, NCS can obviously reduce pH and EC value, improve the available nutrient contents in alkaline soil and thus is effective in improving alkaline soil.