Abstract: In order to reveal the effect of microbial fertilizer application on the improvement of saline-alkali land, and effectively reuse organic waste resources, this paper studied the changes of soil invertase and phosphatase activities and their effects on the growth of sorghum in different growth stages of sorghum. The results showed that:  microbial agent could improve  the activity of soil sucrase, phosphatase, among which T5, T6 had the greatest influence on urease. The soil urease activity in sorghum seedling stage, jointing stage, heading stage and maturity were  1.441, 1.495, and 1.407 and 1.379 mg·g^-1·d^-1, significantly higher than other processing. The effects of each treatment on soil urease at the jointing stage of sorghum were T5>T6>T1>T4>T2>T3>CK; the effects of different treatments on urease activity in different growth stages of sorghum were jointing stage>heading stage>seedling stage>mature stage, which indicated that suitable microbial agents increased soil sucrose and soil phosphatase activity, effectively improved soil fertility, and then improved crop nitrogen use in soil. With the promotion of growth period, the activity of soil phosphatase decreased firstly and then increased. The soil phosphatase activity of T5 was significantly higher than that in other treatments, secondly was T6. The outstanding performances of T5 and T6 were the salt-tolerant strains screened in the early stage, which could improve the geographical traits of salinity and lay a theoretical foundation for further improvement of saline-alkali soil.

Key words: sorghum, soil enzyme activity, microbial agents, growth

摘要： 为揭示微生物菌肥施用对盐碱地的改良效果，将有机废弃物资源有效再利用，研究微生物菌剂对高粱不同生育期土壤蔗糖酶、磷酸酶活性的变化及对高粱生长的影响。结果表明:施用微生物菌肥的各处理均能提高土壤蔗糖酶、磷酸酶的活性，以T5、T6对脲酶的影响最大。在高粱生长苗期、拔节期、抽穗期和成熟期土壤中的脲酶活性较高，分别为1.441、1.495、1.407和1.379 mg·g^-1·d^-1，明显高于其他各处理。各处理对高粱拔节期土壤脲酶的影响效果为T5＞T6＞T1＞T4＞T2＞T3＞CK，各处理对高粱不同生长发育期脲酶活性影响大小为拔节期＞抽穗期＞苗期＞成熟期，这说明适宜微生物菌剂可以显著提高土壤蔗糖酶和磷酸酶活性，有效改善土壤的肥力状况，从而提高作物对土壤中氮素的利用。随着生育期的推进，土壤磷酸酶活性呈现先降后升趋势。T5各生育时期土壤磷酸酶活性均显著高于其他各处理，T6次之。表现突出的T5、T6所用两个菌株是前期筛选出的耐盐菌株，可以改善盐碱地理化性状，为盐碱地改良奠定理论基础。

关键词: 高粱, 土壤酶活性, 微生物菌剂, 生长