摘要
The effects of biological bacterial fertilizer and chemical fertilizer on carbon metabolism characteristics of rhizosphere soil bacteria in rice were studied through a plot experiment.The results showed that the number and Mcintosh index of bacteria in rice rhizosphere soil increased significantly with the application of biological bacterial fertilizer.It was found that the AWCD(average well color development)value of the bacteria remarkably increased and the decomposition of carboxylic acids,amines and heterozygotes were accelerated when adding biological bacterial fertilizer at a proper weight percent.All in all,proper addition of biological bacterial fertilizer could increase the number and carbon metabolism of bacteria.The most appropriate application rate was 70%chemical fertilizer nitrogen+30%biological bacterial fertilizer nitrogen for rice production in Northern Jiangsu Province.
【目的】探究生物菌肥与化肥配施对水稻根际土壤细菌碳代谢特征的影响。【方法】采用田间小区试验,比较研究在总氮用量不变的情况下,不同生物菌肥和化肥配比对水稻根际土壤细菌碳代谢特征的影响。【结果】施用了生物菌肥的水稻根际土壤细菌数量和均一性指数均显著增加,且随着施用量的增加,细菌数量和均一性指数不断增加;适量的生物菌肥可以显著提高根际土壤细菌平均吸光值,有效加快羧酸类、胺类、杂合物类三类碳源的分解,加快其利用率;水稻根际土壤细菌利用的碳源类型主要是羧酸类、糖类、氨基酸类。【结论】施用适量的生物菌肥能够增加水稻根际土壤细菌数量,促进细菌碳代谢,苏北地区水稻生产以70%化肥氮+30%生物菌肥氮施用量为宜。
