稻-麦轮作系统土壤水解酶及氧化还原酶活性对开放式空气CO2浓度增高的响应

研究了FACE条件下(CO2浓度增加200μmol·mol^-1)水稻、小麦不同生育期0～10cm土层土壤脲酶、磷酸酶、芳基硫酸酯酶、脱氢酶活性的变化．结果表明，FACE条件下，土壤脲酶活性在冬小麦生育前期低于对照，在孕穗期高于对照；在水稻生育前期高于对照，在成熟期低于对照．磷酸单酯酶活性在冬小麦生育期高于对照；在水稻分蘖期高于对照，在生育后期(拔节期、抽穗期和成熟期)低于对照．芳基硫酸酯酶活性在小麦越冬期和孕穗期低于对照，在分蘖期和成熟期高于对照；在水稻生育期间均高于对照．脱氢酶活性在小麦和水稻的生育前期低于对照，在后期高于对照．

Response of soil hydrolase and oxidoreductase activities to free-air carbon dioxide enrichment(FACE)under rice-wheat rotation

This paper studied the response of soil urease, phosphatase, arylsulphatase and dehydrogenase to 200 micromol x mol(-1) CO2 elevation under rice-wheat rotation. The results showed that under CO2 elevation, the urease activity in 0-10 cm soil layer was decreased at the early growth stages of wheat but increased at its booting stage; the activity increased at the early growth stages of rice but decreased at its ripening stage. Phosphatase activity was increased during the whole growth period of wheat; the activity increased at the tillering stage of rice but decreased at its later growth stages. Arylsulphatase activity was decreased at the over-wintering and booting stages of wheat but increased at its tillering and ripening stages. Dehydrogenase activity was decreased at the early growth stages of wheat and rice, but increased at their late growth stages.