中文摘要：

利用中国唯一的江都FACE（Free-air CO2 enrichment，开放式空气CO2浓度升高）平台，研究了大气CO2浓度升高下休闲（fallow，不种作物，但翻耕和施肥与其他处理相同）和秸秆还田对土壤脱氢酶、β-葡萄糖苷酶、转化酶、芳基硫酸酯酶和荧光素二乙酸酯水解（FDA）的影响。研究结果表明：大气CO2浓度升高对于休闲土壤酶活性没有影响。在没有秸秆还田的情况下，大气CO2浓度升高刺激了土壤中脱氢酶、β-葡萄糖苷酶、转化酶、芳基硫酸酯酶的活性和FDA水解，增加幅度分别达到了14．88％、19．41％、11．69％、17．12％和4．47％。除转化酶外，秸秆还田使土壤酶活性增加。随着秸秆还田量的增加，FACE效应先增加后消失。

英文摘要：

In this paper a FACE （free air carbon dioxide enrichment） experiment with 4 kinds of soil managements （fallow, 0 organic matter amendment （Ores）, 50% harvested straw amendment （0.Sres） and 150% harvested straw amendment （1.5res）） was conducted to investigate the responses of soil enzyme activities. Results showed that elevated COz had no effect on fallow soil. Straw amendment increased the activities of soil dehydrogenase, J3-glucosidase, arylsulphatase and FDA hydrolysis. With no straw amendment elevated CO2 concentration increased the activities of soil dehydrogenase, β-glucosidase, arylsulphatase, invertase and FDAhydrolysis by 14.88%, 19.41%, 17.12%, 11.69% and 4.47% respectively. FACE effect increased firstly then disappeared with the increase of straw amendments.