title: Soil respiration and its environmental response varies by day/night and by growing/dormant season in a subalpine forest.
abstract: Comparisons of soil respiration (RS) and its components of heterotrophic (RH) and rhizospheric (RR) respiration during daytime and nighttime, growing (GS) and dormant season (DS), have not being well studied and documented. In this study, we compared RS, RH, RR, and their responses to soil temperature (T5) and moisture (θ5) in daytime vs. nighttime and GS vs. DS in a subalpine forest in 2011. In GS, nighttime RSand RHrates were 30.5 ± 4.4% (mean ± SE) and 30.2 ± 6.5% lower than in daytime, while in DS, they were 35.5 ± 5.5% and 37.3 ± 8.5% lower, respectively. DS RSand RHaccounted for 27.3 ± 2.5% and 27.6 ± 2.6% of GS RSand RH, respectively. The temperature sensitivities (Q10) of RSand RHwere higher in nighttime than daytime, and in DS than GS, while they all decreased with increase of T5. Soil C fluxes were more responsive to θ5in nighttime than daytime, and in DS than GS. Our results suggest that the DS and nighttime RSplay an important role in regulating carbon cycle and its response to climate change in alpine forests, and therefore, they should be taken into consideration in order to make accurate predictions of RSand ecosystem carbon cycle under climate change scenarios.
authors.affiliation: College of Resources, Sichuan Agricultural University, 211 Huiming Road, Wenjiang District, Chengdu 611130, Sichuan, China.|The Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Dongxiaofu No.2, Haidian District, Beijing 100091, China.|Key Laboratory of Forest Ecology and Environment, China's State Forestry Administration, Dongxiaofu No.2, Haidian District, Beijing 100091, China.
authors.forename: Zongda
authors.initials: Z
authors.lastname: Hu
authors.affiliation: The Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Dongxiaofu No.2, Haidian District, Beijing 100091, China.|Key Laboratory of Forest Ecology and Environment, China's State Forestry Administration, Dongxiaofu No.2, Haidian District, Beijing 100091, China.
authors.forename: Shirong
authors.initials: S
authors.lastname: Liu
authors.affiliation: Sichuan Academy of Forestry, 18 Xinghui West Road, Chengdu, 610081 Sichuan, China.
authors.forename: Xingliang
authors.initials: X
authors.lastname: Liu
authors.affiliation: Research Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Dongxiaofu No.1, Haidian District, Beijing 100091, China.
authors.forename: Liyong
authors.initials: L
authors.lastname: Fu
authors.affiliation: Division of Forestry and Natural Resources, West Virginia University, P.O. Box 6215, Morgantown, WV, 26506-6125, USA.
authors.forename: Jingxin
authors.initials: J
authors.lastname: Wang
authors.affiliation: Dalla Lana School of Public Health, University of Toronto, 155 College Street, Toronto, Ontario M5T 3M7, Canada.
authors.forename: Kuan
authors.initials: K
authors.lastname: Liu
authors.affiliation: The Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Dongxiaofu No.2, Haidian District, Beijing 100091, China.|Key Laboratory of Forest Ecology and Environment, China's State Forestry Administration, Dongxiaofu No.2, Haidian District, Beijing 100091, China.
authors.forename: Xueman
authors.initials: X
authors.lastname: Huang
authors.affiliation: The Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Dongxiaofu No.2, Haidian District, Beijing 100091, China.|Key Laboratory of Forest Ecology and Environment, China's State Forestry Administration, Dongxiaofu No.2, Haidian District, Beijing 100091, China.
authors.forename: Yuandong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Sichuan Engineering Consulting and Research Institute, 201 Yu Sha Road Xinhua Avenue, Chengdu, 610016, Sichuan, China.
authors.forename: Fei
authors.initials: F
authors.lastname: He
mesh_terms: D002244:Carbon / Q000737:chemistry*; D057486:Carbon Cycle; D057231:Climate Change; D017753:Ecosystem; D065928:Forests; D010101:Oxygen Consumption; D012621:Seasons; D012987:Soil; D013696:Temperature
chemical_list: D012987:Soil; D002244:Carbon