在长白山生态系统中长期的高浓度CO_2熏蒸对土壤酶的影响(英文)

Responses of soil enzymes to long-term CO_2 enrichment in forest ecosystems of Changbai Mountains

从1999年到2006年在中科院长白山森林生态系统定位站(42°24'N,128°28'E,海拔738m)对长期高浓度CO2,蒸对土壤酶活性的影响进行了研究。采用开顶箱(OTC)的方式对红松和长白松进行高浓度CO2处理,CO2浓度分别受控于高浓度CO2箱(500μmol·mol-1)、对照箱(370μmol·mol-1)和裸地(370μmol·mol-1)。经高浓度CO2(500μmol·mol-1),蒸8年后,土壤样品分别在2006年春季、夏季和秋季进行采集和分析。结果表明:在高CO2浓度(500μmol mol-1)条件下,转化酶活性除了红松夏季样品之外都是显著降低的;而脱氢酶活性却是增加的,但只有部分结果显著;长白松的多酚氧化酶活性都显著降低;过氧化氢酶活性在春季增加,而在其他季节均降低。总而言之,在高CO2浓度条件下,土壤酶的活性与树种有关。图2参20。

A study was conducted to determine the responses of soil enzymes （invertase, polyphenol oxidase, catalase, and dehydrogenase） to long-term CO2 enrichment at the Research Station of Changbai Mountain Forest Ecosystems, Chinese Academy of Sciences （42°24＇N, 128°28＇E; 738 m in elevation） in the northeast China during 1999-2006. Three treatments of the CO2 enrichment, designed as 500 μmol·mol-1 CO2 open-top chamber （OTC）, ambient control chamber and unchambered field （approx. 370 μmol·mol^-1CO2）, were conducted with Pinus koraiensis and Pinus sylvestriformis tree species. Soil sampling was made and analyzed separately in spring, summer and autumn in 2006 after the soil enzymes were exposed to elevated CO2 concentration （500 μmol·mol^-1） for eight growing seasons. Results showed that, at elevated CO2 concentration （500 μmol·mol^-1）, the activities of invertase （except for the summer samples of P. koraiensis） presented a remarkable decline in all growing seasons, while the activities of dehydrogenase had an increase but only part of the results was remarkable; the activities of polyphenol oxidase in P. sylvestriformis rhizosphere showed a remarkable decrease; the catalase activities increased in spring, while in turn were decline in other seasons. This study also revealed that the soil enzyme activities are significantly correlated with the tree species under the CO2 enhancement.