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通过盆栽小麦试验,研究了除草剂苯磺隆和2,4-D对小麦生长过程中土壤微生物量碳、氮以及碳/氮比(Cmic/Nmic)的影响。结果表明,苯磺隆、2,4-D对土壤微生物量碳、氮的影响主要表现为先抑制后激活,抑制作用随着时间的延长和浓度的增大而增强,与对照相比达极显著差异水平。苯磺隆、2,4-D对微生物量碳的抑制作用第14天和第7天分别达到最大,为54.9%和45.2%;对微生物量氮的抑制作用均为第7天最大,分别为51.0%和65.4%。2种除草剂处理均在第28天微生物量碳、氮达到最大,为对照的1.09和1.33倍,呈极显著的激活作用,且激活作用随着浓度的增大而增强;对土壤微生物量碳/氮的影响主要呈增加-降低-增加的变化趋势。研究表明苯磺隆、2,4-D对土壤微生物量碳、氮的影响主要与处理的浓度和时间有关,与除草剂的种类无关。
The effects of herbicide tribenuron and 2,4-D on soil microbial biomass carbon, nitrogen and carbon / nitrogen ratio (Cmic / Nmic) were studied through potted wheat experiments. The results showed that the effects of tribenuron-methyl and 2,4-D on soil microbial biomass carbon and nitrogen were mainly inhibited first and then inhibited, and the inhibition increased with time and concentration. Compared with the control Significant difference level. The inhibition effect of tribenuron-methyl and 2,4-D on microbial biomass carbon reached the maximum of 54.9% and 45.2% on the 14th and the 7th days, respectively. The inhibition of microbial biomass nitrogen was the highest on the 7th day 51.0% and 65.4%. In the two herbicidal treatments, the microbial biomass carbon and nitrogen reached the maximum at 1.09 and 1.33 times of the control on the 28th day, respectively. The activities of the two herbicides increased extremely with the increase of the concentration. The soil microbial biomass carbon The influence of nitrogen / nitrogen mainly showed the trend of increase-decrease-increase. The results showed that the effects of tribenuron-methyl and 2,4-D on soil microbial biomass C and N were mainly related to the concentration and time of treatment, not to the species of herbicide.