Winter soil CO2 efflux and its contribution to annual soil respiration   in different ecosystems of a forest-steppe ecotone, north China

doi:10.1016/j.soilbio.2009.11.028

CORC > 北京大学 > 城市与环境学院

	Winter soil CO2 efflux and its contribution to annual soil respiration in different ecosystems of a forest-steppe ecotone, north China
	Wang Wei ; Peng Shushi ; Wang Tao ; Fang Jingyun
刊名	土壤生物学与土壤生物化学
	2010
关键词	Mid-latitude ecosystems Soil organic carbon SR10 Q(10) Winter soil CO2 efflux CARBON-DIOXIDE FLUXES ORGANIC-MATTER DECOMPOSITION ARCTIC SOILS TERRESTRIAL ECOSYSTEMS TEMPERATURE-DEPENDENCE MICROBIAL ACTIVITY DECIDUOUS FOREST HARDWOOD FOREST VEGETATION TYPE TAIGA SOILS
DOI	10.1016/j.soilbio.2009.11.028
英文摘要	Most soil respiration measurements are conducted during the growing season. In tundra and boreal forest ecosystems, cumulative winter soil CO2 fluxes are reported to be a significant component of their annual carbon budgets. However, little information on winter soil CO2 efflux is known from mid-latitude ecosystems. Therefore, comparing measurements of soil respiration taken annually versus during the growing season will improve the accuracy of ecosystem carbon budgets and the response of soil CO2 efflux to climate changes. in this study we measured winter soil CO2 efflux and its contribution to annual soil respiration for seven ecosystems (three forests: Pinus sylvestris var. mongolica plantation, Larix principis-rupprechtii plantation and Betula platyphylla forest; two shrubs: Rosa bella and Malus baccata: and two meadow grasslands) in a forest-steppe ecotone, north China. Overall mean winter and growing season Soil CO2 effluxes were 0.15-0.26 mu mol m(-2) s(-1) and 2.65-4.61 mu mol m(-2) s(-1), respectively, with significant differences in the growing season among the different ecosystems. Annual Q(10) (increased soil respiration rate per 10 degrees C increase in temperature) was generally higher than the growing season Q(10). Soil water content accounted for 84% of the variations in growing season Q(10) and soil temperature range explained 88% of the variation in annual Q(10). Soil organic carbon density to 30 cm depth was a good surrogate for SR10 (basal soil respiration at a reference temperature of 10 degrees C). Annual Soil CO2 efflux ranged from 394.76 g C m(-2) to 973.18 g C m(-2) using observed ecosystem-specific response equations between soil respiration and soil temperature. Estimates ranged from 424.90 g C m(-2) to 784.73 g C m(-2) by interpolating measured soil respiration between sampling dates for every day of the year and then computing the sum to obtain the annual value. The contributions of winter soil CO2 efflux to annual soil respiration were 3.48-7.30% and 4.92-7.83% using interpolated and modeled methods, respectively. Our results indicate that in mid-latitude ecosystems, Soil CO2 efflux continues throughout the winter and winter soil respiration is an important component of annual CO2 efflux. (C) 2009 Elsevier Ltd. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000274839400007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Soil Science; SCI(E); EI; 36; ARTICLE; 3; 451-458; 42
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/161125]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Wang Wei,Peng Shushi,Wang Tao,et al. Winter soil CO2 efflux and its contribution to annual soil respiration in different ecosystems of a forest-steppe ecotone, north China[J]. 土壤生物学与土壤生物化学,2010.
APA	Wang Wei,Peng Shushi,Wang Tao,&Fang Jingyun.(2010).Winter soil CO2 efflux and its contribution to annual soil respiration in different ecosystems of a forest-steppe ecotone, north China.土壤生物学与土壤生物化学.
MLA	Wang Wei,et al."Winter soil CO2 efflux and its contribution to annual soil respiration in different ecosystems of a forest-steppe ecotone, north China".土壤生物学与土壤生物化学 (2010).