应用生态学报2018，Vol.29Issue(2)：433-440,8.DOI:10.13287/j.1001-9332.201802.001
温度对温带和亚热带森林土壤有机碳矿化速率及酶动力学参数的影响
Effects of temperature on soil organic carbon mineralization rate and enzyme kinetic parameters in temperate and subtropical forests
摘要
Abstract
We examined the effects of temperature on SOC mineralization rate (Cmin) and enzyme kinetic parameters in soils of two different latitudinal forests,i.e.,broad-leaved Korean pine forest in Changbai Mountain at higher latitude and evergreen broad-leaved forest in Dinghu Mountain at lower latitude.The results showed that the soil Cmin increased with temperature,and the Cmin and Q10(cmin) of the Changbai Mountain forest soil were higher than those of the Dinghu Mountain forest soil.The maximal rates of velocity (Vmax) and the half-saturation constant (Km) of the Changbai Mountain forest soil were higher relative to the Dinghu Mountain soil for both soil β-glucosidase (βG) and N-acetyl-β-D-glucosaminidase (NAG),but being opposite for catalytic efficiency (Vmax/Km).Both Vmax and Vmax/Km of βG and NAG increased with the increase of incubation temperature,while Km decreased,i.e.,the affinity of enzymes to the substrate were increased.Inconsistent with the soil Q10 (Cmin), Q10(Vmax) and Q10(Km) of the soil βG were higher in Dinghu Mountain forest soil than those in the Changbai Mountain forest soil.The mechanisms underlying the effects of temperate variation on Cmin and the enzyme kinetic parameters were different,and thus the temperature sensitivity of Cmin and enzyme kinetic parameters should be considered differentially in the models of soil biochemical process.关键词
土壤有机碳矿化速率/土壤酶动力学参数/温度敏感性Key words
soil organic carbon mineralization rate/soil enzyme kinetic parameter/temperature sensitivity引用本文复制引用
刘霜,张心昱,杨洋,唐玉倩,王忠强..温度对温带和亚热带森林土壤有机碳矿化速率及酶动力学参数的影响[J].应用生态学报,2018,29(2):433-440,8.基金项目
本文由国家自然科学基金项目(41571251,41571130043)和中国科学院技术创新项目(201604)资助 This work was supported by the National Natural Science Foundation of China (41571251,41571130043) and the Technology Innovation Program of Chinese Academy of Sciences (201604). （41571251,41571130043）
