title: Maximum temperature accounts for annual soil CO2 efflux in temperate forests of Northern China.
abstract: It will help understand the representation legality of soil temperature to explore the correlations of soil respiration with variant properties of soil temperature. Soil temperature at 10 cm depth was hourly logged through twelve months. Basing on the measured soil temperature, soil respiration at different temporal scales were calculated using empirical functions for temperate forests. On monthly scale, soil respiration significantly correlated with maximum, minimum, mean and accumulated effective soil temperatures. Annual soil respiration varied from 409 g C m(-2) in coniferous forest to 570 g C m(-2) in mixed forest and to 692 g C m(-2) in broadleaved forest, and was markedly explained by mean soil temperatures of the warmest day, July and summer, separately. These three soil temperatures reflected the maximum values on diurnal, monthly and annual scales. In accordance with their higher temperatures, summer soil respiration accounted for 51% of annual soil respiration across forest types, and broadleaved forest also had higher soil organic carbon content (SOC) and soil microbial biomass carbon content (SMBC), but a lower contribution of SMBC to SOC. This added proof to the findings that maximum soil temperature may accelerate the transformation of SOC to CO2-C via stimulating activities of soil microorganisms.
authors.affiliation: 1] Ministry of Education Key Laboratory for Silviculture and Conservation, Beijing Forestry University, Beijing, 100083, China [2] The Institute of Forestry and Climate Change Research, Beijing Forestry University, Beijing, 100083, China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Zhou
authors.affiliation: 1] Ministry of Education Key Laboratory for Silviculture and Conservation, Beijing Forestry University, Beijing, 100083, China [2] The Institute of Forestry and Climate Change Research, Beijing Forestry University, Beijing, 100083, China.
authors.forename: Meili
authors.initials: M
authors.lastname: Xu
authors.affiliation: Ministry of Education Key Laboratory for Silviculture and Conservation, Beijing Forestry University, Beijing, 100083, China.
authors.forename: Fengfeng
authors.initials: F
authors.lastname: Kang
authors.affiliation: 1] Ministry of Education Key Laboratory for Silviculture and Conservation, Beijing Forestry University, Beijing, 100083, China [2] The Institute of Forestry and Climate Change Research, Beijing Forestry University, Beijing, 100083, China.
authors.forename: Osbert
authors.initials: O
authors.lastname: Jianxin Sun
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D002980:Climate; D065928:Forests; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D013696:Temperature
chemical_list: D012987:Soil; D002245:Carbon Dioxide