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

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.