不同地下滴灌制度下黄瓜根际微生物活性及功能多样性

In this paper, the effects of subsurface drip irrigation scheduling on microbial activity and functional diversity in rhizosphere of cucumber in solar greenhouse were studied. The results showed that the soil microbial biomass C and N, basal respiration, metabolic quotient and values of AWCD, Shannon and McIntosh indexes were increased and then decreased with improvement of irrigation water amount, and the highest values were observed in Kcp2 treatment in both irrigation intervals. The values of microbial C and N, basal respiration and metabolic quotient in I2 treatments were significantly higher than those in I1 treatments under Kcp2 irrigation level. But as for Simpson index, no significant difference was observed in all treatments. Under Kcp2 treatments, the numbers of bacteria, actinomyces and nitrogen fixing bacteria, and the activities of urease, phosphatase, sucrase, catalase and polyhenoloxidase were significantly higher than other treatments, but the fungi number was increased with improvement of irrigation water amount. The numbers of bacteria and nitrogen fixing bacteria, the activities of urease, phosphatase and sucrase in I2 treatments were significantly higher than those in I1 treatment, the actinomyces number and activities of catalase and polyhenoloxidase were no significant difference between I1 and I2 treatents, but the fungi number were significantly lower than I1 treaments under Kcp 2 irrigation level. The microbial activity and functional diversity in rhizosphere of cucumber rhizosphere were increased under Kcp2I2 treatment, meanwhile, the soil microflora was improved and the soil enzymes activities were increased, thus the cucumber growth was promoted.