To analyses the effects of water deficit in different stages on the variation tendency of soil biological characteristics ( soil invertase, urease, soil microbial biomass carbon, soil organic carbon ) and the fruit yield and quality of greenhouse grape under delayed cultivation,the experiment was carried out at Zhangye Irrigation Experi-ment Station in Gansu Province in 2013-2015 . The results showed:water deficit treatment during germination and shoot growth stage could improve soil invertase activity. There was no difference in water deficit treatment in flower-ing period compared with CK treatment. The treatment of water deficit at the fruit expanding stage and the coloring maturity stage could inhibit the activity of soil invertase. The germination period was the most suitable period to im-prove the activity of soil invertase by water deficit. The treatment of water deficit at the germination stage and at the color maturity stage could inhibit the activity of soil urease. The water deficit treatment from the shoot growth stage to the fruit expanding stage could improve the soil urease activity in the corresponding growth stage. For the soil mi-crobial entropy,the treatment of water deficit at the growth stage of new shoots had a significant effect on it. Accord-ing to the results of correlation analysis and canonical correlation analysis,the soil invertase activity increased with the increased of fruit yield,while the content of soil microbial biomass carbon decreased significantly. The content of titratable acid increased significantly when soil urease activity increased.%为了分析不同生育期水分亏缺下,设施延后栽培葡萄土壤生物学特性(包括土壤蔗糖酶、脲酶、土壤微生物量碳和有机碳)的变化趋势以及不同处理对果实产量与品质影响,于2013-2015年在甘肃省张掖市灌溉试验站进行了设施延后栽培葡萄灌溉试验的研究.结果表明,萌芽期-新梢生长期水分亏缺处理能够提高土壤蔗糖酶活性,开花期水分亏缺处理与CK处理相比无显著性差异,果实膨大期-着色成熟期水分亏缺处理对本阶段土壤蔗糖酶活性具有抑制作用.萌芽期是最适宜通过水分亏缺方式提高土壤蔗糖酶活性的时期.萌芽期水分亏缺处理和着色成熟期水分亏缺处理对土壤脲酶活性都具有抑制作用,新梢生长期-果实膨大期水分亏缺能提高相应生育阶段的土壤脲酶活性.而对土壤微生物熵值来说,新梢生长期水分亏缺处理对其具有显著提高的作用.根据相关分析和典型相关分析结果,果实产量增加时,土壤蔗糖酶活性增大,而土壤微生物量碳含量却显著减少;随着土壤脲酶活性增大,果实中可滴定酸含量明显增大.
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