title: [Temperature sensitivity of soil organic carbon mineralization and β-glucosidase enzymekinetics in the northern temperate forests at different altitudes, China].
abstract: Soil samples, which were collected from three typical forests, i.e., Betula ermanii forest, coniferous mixed broad-leaved forest, and Pinus koraiensis forest, at different altitudes along the southern slope of Laotuding Mountain of Changbai Mountain range in Liaoning Province of China, were incubated over a temperature gradient in laboratory. Soil organic carbon mineralization rates (Cmin), soil β-1,4-glucosidase (βG) kinetics and their temperature sensitivity (Q₁₀) were measured. The results showed that both altitude and temperature had significant effects on Cmin · Cmin increased with temperature and was highest in the B. ermanii forest. The temperature sensitivity of Cmin [Q₁₀(Cmin)] ranked in order of B. ermanii forest > P. koraiensis forest > coniferous mixed broad-leaved forest, but did not differ significantly among the three forests. Both the maximum activity (Vmax) and the Michaelis constant (Km) of the βG responded positively to temperature for all the forests. The temperature sensitivity of Vmax [Q₁₀(Vmax)] ranged from 1.78 to 1.90, and the temperature sensitivity of Km [Q₁₀(Km)] ranged from 1.79 to 2.00. The Q₁₀(Vmax)/Q10(Km) ratios were significantly greater in the B. ermanii soil than in the other two forest soils, suggesting that the βG kinetics-dependent impacts of the global warming or temperature increase on the decomposition of soil organic carbon were temperature sensitive for the forests at the higher altitudes.
authors.forename: Jin-juan
authors.initials: JJ
authors.lastname: Fan
authors.forename: Dan-dan
authors.initials: DD
authors.lastname: Li
authors.forename: Xin-yu
authors.initials: XY
authors.lastname: Zhang
authors.forename: Nian-peng
authors.initials: NP
authors.lastname: He
authors.forename: Jin-feng
authors.initials: JF
authors.lastname: Bu
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.forename: Xiao-min
authors.initials: XM
authors.lastname: Sun
authors.forename: Xue-fa
authors.initials: XF
authors.lastname: Wen
mesh_terms: D000531:Altitude; D029662:Betula; D002244:Carbon / Q000032:analysis*; D002681:China; D065928:Forests; D057232:Global Warming; D028223:Pinus; D012987:Soil / Q000737:chemistry*; D013696:Temperature; D001617:beta-Glucosidase / Q000737:chemistry*
chemical_list: D012987:Soil; D002244:Carbon; D001617:beta-Glucosidase